Driving with disconnected ISV?
#11
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Yvan,
If the ISV is delivering a mixture of LPG and air, that is still more
burnable than the air it is supposed to deliver. The ISV is usually opened
to drop the metering plate to reduce the amount of fuel going into the
engine - but when your ISV opens, it is letting more LPG into the engine.
It sounds backwards to me.
I would change the cap and rotor as a maintenance item, but if the original
oxygen sensor is still in the car I would consider changing it - doubly so
if the convertion to LPG used any silicone sealants to seal the hose
connections (silicone will coat the OXS). If you can get a cheap price on
_any_ 3-wire oxygen sensor, I would get one and splice it into the Audi
harness, or get to know some local Audi owners and borrow one to see if the
change changes anything - get togethers at pubs are helpful - the flow of
beer seems to increase the loaning of tools and selling of spare parts for
less money
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
> I think that hose that is going to the ISV delivers LPG/air mixture, not
> just pure LPG.
>
> I was wrong when posting my original post stating that engine works OK
> on unleaded fuel. Today since my engine stalled almost every time I
> stopped in on red traffic light, I switched back to gasoline, and engine
> then did not die, but it goes to some 650-700 rpm, shakes, then goes to
> 800-850 rpm and than back to 750 that it should be idling.
>
> So since timing can not be adjusted, and I changed spark plugs, I should
> probably change distributer cap, rotating arm in distributer. Can O2
> sensor give that symptoms? I tested it and it oscillates 0.35 V (.17 up
> an d .17 down) but it takes 1.2 sec (should be .3 sec). I am not willing
> to change it, because I think that it has no role when driving on LPG (I
> am not sure about that). Also where I live monthly income is low, (I as
> a system administrator in a firm with 500 employees make 300$ for a
> month) so I am trying to do repairs myself, and Audi part prices are the
> same or higher than in US. I could sell this car, but I love it so much
> it is good and served me well for 6 years, I just have to fix this idle
> thing.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
If the ISV is delivering a mixture of LPG and air, that is still more
burnable than the air it is supposed to deliver. The ISV is usually opened
to drop the metering plate to reduce the amount of fuel going into the
engine - but when your ISV opens, it is letting more LPG into the engine.
It sounds backwards to me.
I would change the cap and rotor as a maintenance item, but if the original
oxygen sensor is still in the car I would consider changing it - doubly so
if the convertion to LPG used any silicone sealants to seal the hose
connections (silicone will coat the OXS). If you can get a cheap price on
_any_ 3-wire oxygen sensor, I would get one and splice it into the Audi
harness, or get to know some local Audi owners and borrow one to see if the
change changes anything - get togethers at pubs are helpful - the flow of
beer seems to increase the loaning of tools and selling of spare parts for
less money
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
> I think that hose that is going to the ISV delivers LPG/air mixture, not
> just pure LPG.
>
> I was wrong when posting my original post stating that engine works OK
> on unleaded fuel. Today since my engine stalled almost every time I
> stopped in on red traffic light, I switched back to gasoline, and engine
> then did not die, but it goes to some 650-700 rpm, shakes, then goes to
> 800-850 rpm and than back to 750 that it should be idling.
>
> So since timing can not be adjusted, and I changed spark plugs, I should
> probably change distributer cap, rotating arm in distributer. Can O2
> sensor give that symptoms? I tested it and it oscillates 0.35 V (.17 up
> an d .17 down) but it takes 1.2 sec (should be .3 sec). I am not willing
> to change it, because I think that it has no role when driving on LPG (I
> am not sure about that). Also where I live monthly income is low, (I as
> a system administrator in a firm with 500 employees make 300$ for a
> month) so I am trying to do repairs myself, and Audi part prices are the
> same or higher than in US. I could sell this car, but I love it so much
> it is good and served me well for 6 years, I just have to fix this idle
> thing.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#12
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Nedavno Steve Sears pise:
| If the ISV is delivering a mixture of LPG and air, that is still more
| burnable than the air it is supposed to deliver.
Yes, but since there is no gasoline it must be LPG-air mixture.
| The ISV is usually
| opened to drop the metering plate to reduce the amount of fuel going
| into the engine - but when your ISV opens, it is letting more LPG into
| the engine. It sounds backwards to me.
| I would change the cap and rotor as a maintenance item, but if the
| original oxygen sensor is still in the car I would consider changing
| it - doubly so if the convertion to LPG used any silicone sealants to
| seal the hose connections (silicone will coat the OXS).
Yes there is some red stuff that looks like silicone sealant where
air/LPG mixer is located. I just wonder if it is necessary. Does O2
sensor have any influence on anything else but amount of injected fuel?
If not I would be changing it for nothing since I drive 99% of time on
LPG. I tried to disconnect it, but it seems to have no effect on idling
whether engine is on LPG or gasoline. But it's definitely not working as
it should I tested it by some instructions provided by Bosch with
oscilloscope.
| If you can
| get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
| splice it into the Audi harness, or get to know some local Audi owners
| and borrow one to see if the change changes anything - get togethers
| at pubs are helpful - the flow of beer seems to increase the loaning
| of tools and selling of spare parts for less money
Ha, interesting idea If you think that O2 sensor does have effect on
something else than amount of injected fuel I will buy one and replace
it. Maybe it will not better things, it certainly will not do any bad.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
| If the ISV is delivering a mixture of LPG and air, that is still more
| burnable than the air it is supposed to deliver.
Yes, but since there is no gasoline it must be LPG-air mixture.
| The ISV is usually
| opened to drop the metering plate to reduce the amount of fuel going
| into the engine - but when your ISV opens, it is letting more LPG into
| the engine. It sounds backwards to me.
| I would change the cap and rotor as a maintenance item, but if the
| original oxygen sensor is still in the car I would consider changing
| it - doubly so if the convertion to LPG used any silicone sealants to
| seal the hose connections (silicone will coat the OXS).
Yes there is some red stuff that looks like silicone sealant where
air/LPG mixer is located. I just wonder if it is necessary. Does O2
sensor have any influence on anything else but amount of injected fuel?
If not I would be changing it for nothing since I drive 99% of time on
LPG. I tried to disconnect it, but it seems to have no effect on idling
whether engine is on LPG or gasoline. But it's definitely not working as
it should I tested it by some instructions provided by Bosch with
oscilloscope.
| If you can
| get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
| splice it into the Audi harness, or get to know some local Audi owners
| and borrow one to see if the change changes anything - get togethers
| at pubs are helpful - the flow of beer seems to increase the loaning
| of tools and selling of spare parts for less money
Ha, interesting idea If you think that O2 sensor does have effect on
something else than amount of injected fuel I will buy one and replace
it. Maybe it will not better things, it certainly will not do any bad.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#13
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Nedavno Steve Sears pise:
| If the ISV is delivering a mixture of LPG and air, that is still more
| burnable than the air it is supposed to deliver.
Yes, but since there is no gasoline it must be LPG-air mixture.
| The ISV is usually
| opened to drop the metering plate to reduce the amount of fuel going
| into the engine - but when your ISV opens, it is letting more LPG into
| the engine. It sounds backwards to me.
| I would change the cap and rotor as a maintenance item, but if the
| original oxygen sensor is still in the car I would consider changing
| it - doubly so if the convertion to LPG used any silicone sealants to
| seal the hose connections (silicone will coat the OXS).
Yes there is some red stuff that looks like silicone sealant where
air/LPG mixer is located. I just wonder if it is necessary. Does O2
sensor have any influence on anything else but amount of injected fuel?
If not I would be changing it for nothing since I drive 99% of time on
LPG. I tried to disconnect it, but it seems to have no effect on idling
whether engine is on LPG or gasoline. But it's definitely not working as
it should I tested it by some instructions provided by Bosch with
oscilloscope.
| If you can
| get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
| splice it into the Audi harness, or get to know some local Audi owners
| and borrow one to see if the change changes anything - get togethers
| at pubs are helpful - the flow of beer seems to increase the loaning
| of tools and selling of spare parts for less money
Ha, interesting idea If you think that O2 sensor does have effect on
something else than amount of injected fuel I will buy one and replace
it. Maybe it will not better things, it certainly will not do any bad.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
| If the ISV is delivering a mixture of LPG and air, that is still more
| burnable than the air it is supposed to deliver.
Yes, but since there is no gasoline it must be LPG-air mixture.
| The ISV is usually
| opened to drop the metering plate to reduce the amount of fuel going
| into the engine - but when your ISV opens, it is letting more LPG into
| the engine. It sounds backwards to me.
| I would change the cap and rotor as a maintenance item, but if the
| original oxygen sensor is still in the car I would consider changing
| it - doubly so if the convertion to LPG used any silicone sealants to
| seal the hose connections (silicone will coat the OXS).
Yes there is some red stuff that looks like silicone sealant where
air/LPG mixer is located. I just wonder if it is necessary. Does O2
sensor have any influence on anything else but amount of injected fuel?
If not I would be changing it for nothing since I drive 99% of time on
LPG. I tried to disconnect it, but it seems to have no effect on idling
whether engine is on LPG or gasoline. But it's definitely not working as
it should I tested it by some instructions provided by Bosch with
oscilloscope.
| If you can
| get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
| splice it into the Audi harness, or get to know some local Audi owners
| and borrow one to see if the change changes anything - get togethers
| at pubs are helpful - the flow of beer seems to increase the loaning
| of tools and selling of spare parts for less money
Ha, interesting idea If you think that O2 sensor does have effect on
something else than amount of injected fuel I will buy one and replace
it. Maybe it will not better things, it certainly will not do any bad.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#14
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Yvan,
Ideally, I believe that the LPG go through the main intake _only_ and not
also through the ISV.....but I'm sure that the people who designed the
system know their stuff. The use of silicone sealant is troublesopme,
though.
Check out:
http://www.sjmautotechnik.com/troubl.../10vo2sen.html
The oxygen sensor feeds back to the engine control unit, which does figure
in to the idle of the car. Part way down Scott mentions that carbon plugged
slots in the OXS will result in fluctuating idle mixture and idle speed.
That _may_ be your culprit.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
"Yvan" <me@privacy.net> wrote in message
news:20041023103931.79997d97@iva.imperl.com...
> Nedavno Steve Sears pise:
>
> | If the ISV is delivering a mixture of LPG and air, that is still more
> | burnable than the air it is supposed to deliver.
>
> Yes, but since there is no gasoline it must be LPG-air mixture.
>
> | The ISV is usually
> | opened to drop the metering plate to reduce the amount of fuel going
> | into the engine - but when your ISV opens, it is letting more LPG into
> | the engine. It sounds backwards to me.
> | I would change the cap and rotor as a maintenance item, but if the
> | original oxygen sensor is still in the car I would consider changing
> | it - doubly so if the convertion to LPG used any silicone sealants to
> | seal the hose connections (silicone will coat the OXS).
>
> Yes there is some red stuff that looks like silicone sealant where
> air/LPG mixer is located. I just wonder if it is necessary. Does O2
> sensor have any influence on anything else but amount of injected fuel?
> If not I would be changing it for nothing since I drive 99% of time on
> LPG. I tried to disconnect it, but it seems to have no effect on idling
> whether engine is on LPG or gasoline. But it's definitely not working as
> it should I tested it by some instructions provided by Bosch with
> oscilloscope.
>
> | If you can
> | get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
> | splice it into the Audi harness, or get to know some local Audi owners
> | and borrow one to see if the change changes anything - get togethers
> | at pubs are helpful - the flow of beer seems to increase the loaning
> | of tools and selling of spare parts for less money
>
> Ha, interesting idea If you think that O2 sensor does have effect on
> something else than amount of injected fuel I will buy one and replace
> it. Maybe it will not better things, it certainly will not do any bad.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
Ideally, I believe that the LPG go through the main intake _only_ and not
also through the ISV.....but I'm sure that the people who designed the
system know their stuff. The use of silicone sealant is troublesopme,
though.
Check out:
http://www.sjmautotechnik.com/troubl.../10vo2sen.html
The oxygen sensor feeds back to the engine control unit, which does figure
in to the idle of the car. Part way down Scott mentions that carbon plugged
slots in the OXS will result in fluctuating idle mixture and idle speed.
That _may_ be your culprit.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
"Yvan" <me@privacy.net> wrote in message
news:20041023103931.79997d97@iva.imperl.com...
> Nedavno Steve Sears pise:
>
> | If the ISV is delivering a mixture of LPG and air, that is still more
> | burnable than the air it is supposed to deliver.
>
> Yes, but since there is no gasoline it must be LPG-air mixture.
>
> | The ISV is usually
> | opened to drop the metering plate to reduce the amount of fuel going
> | into the engine - but when your ISV opens, it is letting more LPG into
> | the engine. It sounds backwards to me.
> | I would change the cap and rotor as a maintenance item, but if the
> | original oxygen sensor is still in the car I would consider changing
> | it - doubly so if the convertion to LPG used any silicone sealants to
> | seal the hose connections (silicone will coat the OXS).
>
> Yes there is some red stuff that looks like silicone sealant where
> air/LPG mixer is located. I just wonder if it is necessary. Does O2
> sensor have any influence on anything else but amount of injected fuel?
> If not I would be changing it for nothing since I drive 99% of time on
> LPG. I tried to disconnect it, but it seems to have no effect on idling
> whether engine is on LPG or gasoline. But it's definitely not working as
> it should I tested it by some instructions provided by Bosch with
> oscilloscope.
>
> | If you can
> | get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
> | splice it into the Audi harness, or get to know some local Audi owners
> | and borrow one to see if the change changes anything - get togethers
> | at pubs are helpful - the flow of beer seems to increase the loaning
> | of tools and selling of spare parts for less money
>
> Ha, interesting idea If you think that O2 sensor does have effect on
> something else than amount of injected fuel I will buy one and replace
> it. Maybe it will not better things, it certainly will not do any bad.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#15
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Yvan,
Ideally, I believe that the LPG go through the main intake _only_ and not
also through the ISV.....but I'm sure that the people who designed the
system know their stuff. The use of silicone sealant is troublesopme,
though.
Check out:
http://www.sjmautotechnik.com/troubl.../10vo2sen.html
The oxygen sensor feeds back to the engine control unit, which does figure
in to the idle of the car. Part way down Scott mentions that carbon plugged
slots in the OXS will result in fluctuating idle mixture and idle speed.
That _may_ be your culprit.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
"Yvan" <me@privacy.net> wrote in message
news:20041023103931.79997d97@iva.imperl.com...
> Nedavno Steve Sears pise:
>
> | If the ISV is delivering a mixture of LPG and air, that is still more
> | burnable than the air it is supposed to deliver.
>
> Yes, but since there is no gasoline it must be LPG-air mixture.
>
> | The ISV is usually
> | opened to drop the metering plate to reduce the amount of fuel going
> | into the engine - but when your ISV opens, it is letting more LPG into
> | the engine. It sounds backwards to me.
> | I would change the cap and rotor as a maintenance item, but if the
> | original oxygen sensor is still in the car I would consider changing
> | it - doubly so if the convertion to LPG used any silicone sealants to
> | seal the hose connections (silicone will coat the OXS).
>
> Yes there is some red stuff that looks like silicone sealant where
> air/LPG mixer is located. I just wonder if it is necessary. Does O2
> sensor have any influence on anything else but amount of injected fuel?
> If not I would be changing it for nothing since I drive 99% of time on
> LPG. I tried to disconnect it, but it seems to have no effect on idling
> whether engine is on LPG or gasoline. But it's definitely not working as
> it should I tested it by some instructions provided by Bosch with
> oscilloscope.
>
> | If you can
> | get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
> | splice it into the Audi harness, or get to know some local Audi owners
> | and borrow one to see if the change changes anything - get togethers
> | at pubs are helpful - the flow of beer seems to increase the loaning
> | of tools and selling of spare parts for less money
>
> Ha, interesting idea If you think that O2 sensor does have effect on
> something else than amount of injected fuel I will buy one and replace
> it. Maybe it will not better things, it certainly will not do any bad.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
Ideally, I believe that the LPG go through the main intake _only_ and not
also through the ISV.....but I'm sure that the people who designed the
system know their stuff. The use of silicone sealant is troublesopme,
though.
Check out:
http://www.sjmautotechnik.com/troubl.../10vo2sen.html
The oxygen sensor feeds back to the engine control unit, which does figure
in to the idle of the car. Part way down Scott mentions that carbon plugged
slots in the OXS will result in fluctuating idle mixture and idle speed.
That _may_ be your culprit.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
"Yvan" <me@privacy.net> wrote in message
news:20041023103931.79997d97@iva.imperl.com...
> Nedavno Steve Sears pise:
>
> | If the ISV is delivering a mixture of LPG and air, that is still more
> | burnable than the air it is supposed to deliver.
>
> Yes, but since there is no gasoline it must be LPG-air mixture.
>
> | The ISV is usually
> | opened to drop the metering plate to reduce the amount of fuel going
> | into the engine - but when your ISV opens, it is letting more LPG into
> | the engine. It sounds backwards to me.
> | I would change the cap and rotor as a maintenance item, but if the
> | original oxygen sensor is still in the car I would consider changing
> | it - doubly so if the convertion to LPG used any silicone sealants to
> | seal the hose connections (silicone will coat the OXS).
>
> Yes there is some red stuff that looks like silicone sealant where
> air/LPG mixer is located. I just wonder if it is necessary. Does O2
> sensor have any influence on anything else but amount of injected fuel?
> If not I would be changing it for nothing since I drive 99% of time on
> LPG. I tried to disconnect it, but it seems to have no effect on idling
> whether engine is on LPG or gasoline. But it's definitely not working as
> it should I tested it by some instructions provided by Bosch with
> oscilloscope.
>
> | If you can
> | get a cheap price on_any_ 3-wire oxygen sensor, I would get one and
> | splice it into the Audi harness, or get to know some local Audi owners
> | and borrow one to see if the change changes anything - get togethers
> | at pubs are helpful - the flow of beer seems to increase the loaning
> | of tools and selling of spare parts for less money
>
> Ha, interesting idea If you think that O2 sensor does have effect on
> something else than amount of injected fuel I will buy one and replace
> it. Maybe it will not better things, it certainly will not do any bad.
>
>
>
> --
> ___ ____
> /__/ / \ ** Registrovani korisnik Linuksa #291606 **
> / / \/ /\ \ ** http://counter.li.org/ **
> /__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#16
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Nedavno Steve Sears pise:
| Ideally, I believe that the LPG go through the main intake _only_ and
| not also through the ISV.....but I'm sure that the people who designed
| the system know their stuff. The use of silicone sealant is
| troublesome, though.
| Check out:
| http://www.sjmautotechnik.com/troubl.../10vo2sen.html
| The oxygen sensor feeds back to the engine control unit, which does
| figure in to the idle of the car. Part way down Scott mentions that
| carbon plugged slots in the OXS will result in fluctuating idle
| mixture and idle speed. That _may_ be your culprit.
Yes, but disconnecting O2 sensor for a while should solve my problem,
and then I could buy new one.
What about deceleration valve? Do I have one? Could stuck decel valve be
my problem?
I borrowed one ISV from a guy that sells used Audi parts. He only had
one like this:
http://www.sjmautotechnik.com/troubl...c/idlesta2.jpg
which is slightly different then one I have. Borrowed one passed blowing
test (as you mentioned it should be closed with no power). Mine did not,
but looking at how it operates I am almost sure that that is the way it
is suppose to be. With ISV in horizontal position there is a 1 mm gap on
the top of a rotating metal thing that can be seen on the "in" side of
ISV. With 9V power rotates up first closing mentioned 1 mm gap and then
opening gap below it. I hope you can understand this
Anyway, fitting other ISV did not do anything, problem is still hire.
Again I was wondering about decel valve. Perhaps if I have one I could
temporarily disable it to see if it is stuck? As I understand it should
be somewhere on air filter box. I will check tomorrow (hire is night
now) but it would help if I would knew what it looks like.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
| Ideally, I believe that the LPG go through the main intake _only_ and
| not also through the ISV.....but I'm sure that the people who designed
| the system know their stuff. The use of silicone sealant is
| troublesome, though.
| Check out:
| http://www.sjmautotechnik.com/troubl.../10vo2sen.html
| The oxygen sensor feeds back to the engine control unit, which does
| figure in to the idle of the car. Part way down Scott mentions that
| carbon plugged slots in the OXS will result in fluctuating idle
| mixture and idle speed. That _may_ be your culprit.
Yes, but disconnecting O2 sensor for a while should solve my problem,
and then I could buy new one.
What about deceleration valve? Do I have one? Could stuck decel valve be
my problem?
I borrowed one ISV from a guy that sells used Audi parts. He only had
one like this:
http://www.sjmautotechnik.com/troubl...c/idlesta2.jpg
which is slightly different then one I have. Borrowed one passed blowing
test (as you mentioned it should be closed with no power). Mine did not,
but looking at how it operates I am almost sure that that is the way it
is suppose to be. With ISV in horizontal position there is a 1 mm gap on
the top of a rotating metal thing that can be seen on the "in" side of
ISV. With 9V power rotates up first closing mentioned 1 mm gap and then
opening gap below it. I hope you can understand this
Anyway, fitting other ISV did not do anything, problem is still hire.
Again I was wondering about decel valve. Perhaps if I have one I could
temporarily disable it to see if it is stuck? As I understand it should
be somewhere on air filter box. I will check tomorrow (hire is night
now) but it would help if I would knew what it looks like.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#17
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Nedavno Steve Sears pise:
| Ideally, I believe that the LPG go through the main intake _only_ and
| not also through the ISV.....but I'm sure that the people who designed
| the system know their stuff. The use of silicone sealant is
| troublesome, though.
| Check out:
| http://www.sjmautotechnik.com/troubl.../10vo2sen.html
| The oxygen sensor feeds back to the engine control unit, which does
| figure in to the idle of the car. Part way down Scott mentions that
| carbon plugged slots in the OXS will result in fluctuating idle
| mixture and idle speed. That _may_ be your culprit.
Yes, but disconnecting O2 sensor for a while should solve my problem,
and then I could buy new one.
What about deceleration valve? Do I have one? Could stuck decel valve be
my problem?
I borrowed one ISV from a guy that sells used Audi parts. He only had
one like this:
http://www.sjmautotechnik.com/troubl...c/idlesta2.jpg
which is slightly different then one I have. Borrowed one passed blowing
test (as you mentioned it should be closed with no power). Mine did not,
but looking at how it operates I am almost sure that that is the way it
is suppose to be. With ISV in horizontal position there is a 1 mm gap on
the top of a rotating metal thing that can be seen on the "in" side of
ISV. With 9V power rotates up first closing mentioned 1 mm gap and then
opening gap below it. I hope you can understand this
Anyway, fitting other ISV did not do anything, problem is still hire.
Again I was wondering about decel valve. Perhaps if I have one I could
temporarily disable it to see if it is stuck? As I understand it should
be somewhere on air filter box. I will check tomorrow (hire is night
now) but it would help if I would knew what it looks like.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
| Ideally, I believe that the LPG go through the main intake _only_ and
| not also through the ISV.....but I'm sure that the people who designed
| the system know their stuff. The use of silicone sealant is
| troublesome, though.
| Check out:
| http://www.sjmautotechnik.com/troubl.../10vo2sen.html
| The oxygen sensor feeds back to the engine control unit, which does
| figure in to the idle of the car. Part way down Scott mentions that
| carbon plugged slots in the OXS will result in fluctuating idle
| mixture and idle speed. That _may_ be your culprit.
Yes, but disconnecting O2 sensor for a while should solve my problem,
and then I could buy new one.
What about deceleration valve? Do I have one? Could stuck decel valve be
my problem?
I borrowed one ISV from a guy that sells used Audi parts. He only had
one like this:
http://www.sjmautotechnik.com/troubl...c/idlesta2.jpg
which is slightly different then one I have. Borrowed one passed blowing
test (as you mentioned it should be closed with no power). Mine did not,
but looking at how it operates I am almost sure that that is the way it
is suppose to be. With ISV in horizontal position there is a 1 mm gap on
the top of a rotating metal thing that can be seen on the "in" side of
ISV. With 9V power rotates up first closing mentioned 1 mm gap and then
opening gap below it. I hope you can understand this
Anyway, fitting other ISV did not do anything, problem is still hire.
Again I was wondering about decel valve. Perhaps if I have one I could
temporarily disable it to see if it is stuck? As I understand it should
be somewhere on air filter box. I will check tomorrow (hire is night
now) but it would help if I would knew what it looks like.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
#18
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Yvan,
The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve, the
failure of which could result in the engine stalling (it cuts the fuel
delivery off to the engine when the car decelerates, thus reducing fuel
consumption) - but that is for the fuel system, which your LPG system is not
using. There's a Russian web site that has all the parts diagrams - if you
ask the collective at www.audifans.com - I'm sure someone will send you the
link to the site (it's often referred to as the "Family Album").
I think you should give all of the intake hoses a real close check for
cracks or leaks - also in the connections between the LPG system and the
car's original system hoses - the underside of the intake hoses rots out
first due to oil from the crankcase recirculation (and turbo leaks). When
the car is idling, the intake is under a vacuum and may cause an
intermittent leak in a broken hose - changing the fuel/LPG mixture and thus
the idle.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve, the
failure of which could result in the engine stalling (it cuts the fuel
delivery off to the engine when the car decelerates, thus reducing fuel
consumption) - but that is for the fuel system, which your LPG system is not
using. There's a Russian web site that has all the parts diagrams - if you
ask the collective at www.audifans.com - I'm sure someone will send you the
link to the site (it's often referred to as the "Family Album").
I think you should give all of the intake hoses a real close check for
cracks or leaks - also in the connections between the LPG system and the
car's original system hoses - the underside of the intake hoses rots out
first due to oil from the crankcase recirculation (and turbo leaks). When
the car is idling, the intake is under a vacuum and may cause an
intermittent leak in a broken hose - changing the fuel/LPG mixture and thus
the idle.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
#19
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Yvan,
The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve, the
failure of which could result in the engine stalling (it cuts the fuel
delivery off to the engine when the car decelerates, thus reducing fuel
consumption) - but that is for the fuel system, which your LPG system is not
using. There's a Russian web site that has all the parts diagrams - if you
ask the collective at www.audifans.com - I'm sure someone will send you the
link to the site (it's often referred to as the "Family Album").
I think you should give all of the intake hoses a real close check for
cracks or leaks - also in the connections between the LPG system and the
car's original system hoses - the underside of the intake hoses rots out
first due to oil from the crankcase recirculation (and turbo leaks). When
the car is idling, the intake is under a vacuum and may cause an
intermittent leak in a broken hose - changing the fuel/LPG mixture and thus
the idle.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve, the
failure of which could result in the engine stalling (it cuts the fuel
delivery off to the engine when the car decelerates, thus reducing fuel
consumption) - but that is for the fuel system, which your LPG system is not
using. There's a Russian web site that has all the parts diagrams - if you
ask the collective at www.audifans.com - I'm sure someone will send you the
link to the site (it's often referred to as the "Family Album").
I think you should give all of the intake hoses a real close check for
cracks or leaks - also in the connections between the LPG system and the
car's original system hoses - the underside of the intake hoses rots out
first due to oil from the crankcase recirculation (and turbo leaks). When
the car is idling, the intake is under a vacuum and may cause an
intermittent leak in a broken hose - changing the fuel/LPG mixture and thus
the idle.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)
#20
Guest
Posts: n/a
Re: Driving with disconnected ISV?
Nedavno Steve Sears pise:
| The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve,
| the failure of which could result in the engine stalling (it cuts the
| fuel delivery off to the engine when the car decelerates, thus
| reducing fuel consumption) - but that is for the fuel system, which
| your LPG system is not using.
Yes, but from:
http://www.sjmautotechnik.com/troubl...sys.html#decel
"These valves have been known to stick open and then not shut when the
RPM drops below 1200 which causes the big vacuum leak and the stalling"
So if deceleration valve is not completely stick, but slow in response
(close to sticking, but still works) I would have vacuum leak. I do not
knew if this is possible.
| There's a Russian web site that has all
| the parts diagrams
Yes, I knew, I found it some time ago, its:
http://www.elcats.ru/audivw/nn/
I was searching there and on page:
http://www.elcats.ru/audivw/nn/vag4....1988&cyl=&vol=
when you click on nine-th item from the top, and then on the button
below the picture on the left, (NF engine) there is no decel valve. But
if you click on the eighth item from the top and then on the button
below the picture on the left, (MC engine) there is one. So it seems
that I do not have one.
What about EGR valve? Where is it? I can not find it either on Russian
site. Do I have it? Can that be the problem?
| I think you should give all of the
| intake hoses a real close check for cracks or leaks - also in the
| connections between the LPG system and the car's original system hoses
| - the underside of the intake hoses rots out first due to oil from the
| crankcase recirculation (and turbo leaks). When the car is idling,
| the intake is under a vacuum and may cause an intermittent leak in a
| broken hose - changing the fuel/LPG mixture and thus the idle.
I already checked intake hoses. Only breather hose was broken, and I
replaced it.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **
| The system in the 1987 Audi 5000 Turbo/200 used a deceleration valve,
| the failure of which could result in the engine stalling (it cuts the
| fuel delivery off to the engine when the car decelerates, thus
| reducing fuel consumption) - but that is for the fuel system, which
| your LPG system is not using.
Yes, but from:
http://www.sjmautotechnik.com/troubl...sys.html#decel
"These valves have been known to stick open and then not shut when the
RPM drops below 1200 which causes the big vacuum leak and the stalling"
So if deceleration valve is not completely stick, but slow in response
(close to sticking, but still works) I would have vacuum leak. I do not
knew if this is possible.
| There's a Russian web site that has all
| the parts diagrams
Yes, I knew, I found it some time ago, its:
http://www.elcats.ru/audivw/nn/
I was searching there and on page:
http://www.elcats.ru/audivw/nn/vag4....1988&cyl=&vol=
when you click on nine-th item from the top, and then on the button
below the picture on the left, (NF engine) there is no decel valve. But
if you click on the eighth item from the top and then on the button
below the picture on the left, (MC engine) there is one. So it seems
that I do not have one.
What about EGR valve? Where is it? I can not find it either on Russian
site. Do I have it? Can that be the problem?
| I think you should give all of the
| intake hoses a real close check for cracks or leaks - also in the
| connections between the LPG system and the car's original system hoses
| - the underside of the intake hoses rots out first due to oil from the
| crankcase recirculation (and turbo leaks). When the car is idling,
| the intake is under a vacuum and may cause an intermittent leak in a
| broken hose - changing the fuel/LPG mixture and thus the idle.
I already checked intake hoses. Only breather hose was broken, and I
replaced it.
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: iimperl - at - ml1 - dot - net **