A6 2.5TDI Smoking + ultrasonically cleaning injectors
#31
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Tim (Remove NOSPAM. wrote:
> "AstraVanMan" <Off@WithThanks.com> wrote in message
> news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
>> It doesn't do it massive amounts (not that I can see in the mirror
>> from the driver's seat) but a mate of mine has said that it smokes
>> quite a bit, and that it can be thick and black (yup, it's a
>> diesel!).
>>
>> Obviously it's the sort of thing you notice more at night than in
>> daylight, but this morning when leaving for work (engine had only
>> been running a couple of minutes up to this point btw) pulling away
>> not particularly quickly resulted in not particularly thick (but
>> still noticeable) smoke in the car behind's headlights. Obviously
>> darkness and headlights do tend to emphasise any smoke coming out
of
>> any car's exhaust though.
>>
>> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
have
>> a MAF sensor, and is this easy enough to take out and clean (should
>> this be neccessary), and if that's all ok, how much should I expect
>> to have to pay to get the injectors ultrasonically cleaned.
>>
>
> If you have power loss and no smoke then in typical VAG fashion the
> MAF is buggered. If not then the MAF is fine- you wont get excess
> smoke from a faulty MAF.
>
> At 125k or so the injectors are well past it-
They really shouldn't be, although they could be. I've never had a
general wear or maintainance problem with them at this mileage on a
modern engine although the very occasional one does actually fail in
some way.
have them overhauled if
> it is getting abit smokey- likewise clean out the EGR system, and if
> possible blank it off- this is a major cause of excess smoke.
Yes, all those vacuum operated valves which restrict air flow etc and
which rely on small capillary tubes are a potential nightmare. I've
long rendered my Isuzu's system inoperable due to problems. My Toyota
OTOH has been no bother in this area, neither have the Nissans. Yet.
Huw
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> "AstraVanMan" <Off@WithThanks.com> wrote in message
> news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
>> It doesn't do it massive amounts (not that I can see in the mirror
>> from the driver's seat) but a mate of mine has said that it smokes
>> quite a bit, and that it can be thick and black (yup, it's a
>> diesel!).
>>
>> Obviously it's the sort of thing you notice more at night than in
>> daylight, but this morning when leaving for work (engine had only
>> been running a couple of minutes up to this point btw) pulling away
>> not particularly quickly resulted in not particularly thick (but
>> still noticeable) smoke in the car behind's headlights. Obviously
>> darkness and headlights do tend to emphasise any smoke coming out
of
>> any car's exhaust though.
>>
>> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
have
>> a MAF sensor, and is this easy enough to take out and clean (should
>> this be neccessary), and if that's all ok, how much should I expect
>> to have to pay to get the injectors ultrasonically cleaned.
>>
>
> If you have power loss and no smoke then in typical VAG fashion the
> MAF is buggered. If not then the MAF is fine- you wont get excess
> smoke from a faulty MAF.
>
> At 125k or so the injectors are well past it-
They really shouldn't be, although they could be. I've never had a
general wear or maintainance problem with them at this mileage on a
modern engine although the very occasional one does actually fail in
some way.
have them overhauled if
> it is getting abit smokey- likewise clean out the EGR system, and if
> possible blank it off- this is a major cause of excess smoke.
Yes, all those vacuum operated valves which restrict air flow etc and
which rely on small capillary tubes are a potential nightmare. I've
long rendered my Isuzu's system inoperable due to problems. My Toyota
OTOH has been no bother in this area, neither have the Nissans. Yet.
Huw
---
Outgoing mail is certified Virus Free.
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#32
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Nedavno Huw pise:
| cheaper, is a litre of ATF [automatic transmission fluid] for every 20
| gallons of diesel in the tank. This is only needed once [a year
| perhaps] and, in the case of ATF, will take the consumption of a
| tankfull or two to work, but work it will.
Can ATF be added in a petrol engine for injector cleaning (NF 5-cylinder
2.3 engine)?
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: ivica - at - ptt - dot - yu **
| cheaper, is a litre of ATF [automatic transmission fluid] for every 20
| gallons of diesel in the tank. This is only needed once [a year
| perhaps] and, in the case of ATF, will take the consumption of a
| tankfull or two to work, but work it will.
Can ATF be added in a petrol engine for injector cleaning (NF 5-cylinder
2.3 engine)?
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: ivica - at - ptt - dot - yu **
#33
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Nedavno Huw pise:
| cheaper, is a litre of ATF [automatic transmission fluid] for every 20
| gallons of diesel in the tank. This is only needed once [a year
| perhaps] and, in the case of ATF, will take the consumption of a
| tankfull or two to work, but work it will.
Can ATF be added in a petrol engine for injector cleaning (NF 5-cylinder
2.3 engine)?
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: ivica - at - ptt - dot - yu **
| cheaper, is a litre of ATF [automatic transmission fluid] for every 20
| gallons of diesel in the tank. This is only needed once [a year
| perhaps] and, in the case of ATF, will take the consumption of a
| tankfull or two to work, but work it will.
Can ATF be added in a petrol engine for injector cleaning (NF 5-cylinder
2.3 engine)?
--
___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** http://counter.li.org/ **
/__/\____/--\__\ ** Reply at: ivica - at - ptt - dot - yu **
#34
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
I think you're splitting hairs here, you've got a diesel, right? Well, most
diesels produce rather a nasty amount of smoke when floored at low revs.
Other than that, you might want to check your vacuum lines to make sure you
get all that precious air in. Cleaning injectors at your mileage? A waste of
money in my opinion. Cleaning your MAF is probably more to the point, but
then again, if you look at your consumption figures and they're no different
from when car was new I'd suggest there's nothing wrong in that department,
either.
JP Roberts
P.S.: Want a cleaner car? Go petrol or buy newer diesel engine with particle
filter.
"AstraVanMan" <Off@WithThanks.com> escribió en el mensaje
news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> It doesn't do it massive amounts (not that I can see in the mirror from
the
> driver's seat) but a mate of mine has said that it smokes quite a bit, and
> that it can be thick and black (yup, it's a diesel!).
>
> Obviously it's the sort of thing you notice more at night than in
daylight,
> but this morning when leaving for work (engine had only been running a
> couple of minutes up to this point btw) pulling away not particularly
> quickly resulted in not particularly thick (but still noticeable) smoke in
> the car behind's headlights. Obviously darkness and headlights do tend to
> emphasise any smoke coming out of any car's exhaust though.
>
> My question is this - does my engine (5-cylinder 140bhp 2.5TDI) have a MAF
> sensor, and is this easy enough to take out and clean (should this be
> neccessary), and if that's all ok, how much should I expect to have to pay
> to get the injectors ultrasonically cleaned.
>
> And is there much variation on the quality of ultrasonic cleaning services
> available (I don't want some cowboys ing them up) or is it a
> straightforward job that the machine takes care of with not much chance of
> anything going wrong?
>
> Btw, the car has just short of 127k on the clock, and has been regularly
> serviced all its life (every 10k up to 50k at audi main delaer, then every
> 6k up to 94k with a new air filter and fuel filter every time, then at
105k,
> 114k, 125k, with one new air filter at 114k and a new fuel filter at
125k).
> So I wouldn't say it's been neglected, though I have worried a little
about
> the time I've left it between oil changes (though it's been largely
motorway
> use) and the mileage the laster air filter and fuel filter did before
> changing (20k and 30k respectively). Am I worrying about nothing on these
> points? Is it the MAF sensor that needs cleaning, or is it time for
> injector overhaul?
>
> Peter
> --
> "The truth is working in television is not very glamorous at all. I just
go
> home on my own at night and sit alone and eat crisps."
>
>
diesels produce rather a nasty amount of smoke when floored at low revs.
Other than that, you might want to check your vacuum lines to make sure you
get all that precious air in. Cleaning injectors at your mileage? A waste of
money in my opinion. Cleaning your MAF is probably more to the point, but
then again, if you look at your consumption figures and they're no different
from when car was new I'd suggest there's nothing wrong in that department,
either.
JP Roberts
P.S.: Want a cleaner car? Go petrol or buy newer diesel engine with particle
filter.
"AstraVanMan" <Off@WithThanks.com> escribió en el mensaje
news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> It doesn't do it massive amounts (not that I can see in the mirror from
the
> driver's seat) but a mate of mine has said that it smokes quite a bit, and
> that it can be thick and black (yup, it's a diesel!).
>
> Obviously it's the sort of thing you notice more at night than in
daylight,
> but this morning when leaving for work (engine had only been running a
> couple of minutes up to this point btw) pulling away not particularly
> quickly resulted in not particularly thick (but still noticeable) smoke in
> the car behind's headlights. Obviously darkness and headlights do tend to
> emphasise any smoke coming out of any car's exhaust though.
>
> My question is this - does my engine (5-cylinder 140bhp 2.5TDI) have a MAF
> sensor, and is this easy enough to take out and clean (should this be
> neccessary), and if that's all ok, how much should I expect to have to pay
> to get the injectors ultrasonically cleaned.
>
> And is there much variation on the quality of ultrasonic cleaning services
> available (I don't want some cowboys ing them up) or is it a
> straightforward job that the machine takes care of with not much chance of
> anything going wrong?
>
> Btw, the car has just short of 127k on the clock, and has been regularly
> serviced all its life (every 10k up to 50k at audi main delaer, then every
> 6k up to 94k with a new air filter and fuel filter every time, then at
105k,
> 114k, 125k, with one new air filter at 114k and a new fuel filter at
125k).
> So I wouldn't say it's been neglected, though I have worried a little
about
> the time I've left it between oil changes (though it's been largely
motorway
> use) and the mileage the laster air filter and fuel filter did before
> changing (20k and 30k respectively). Am I worrying about nothing on these
> points? Is it the MAF sensor that needs cleaning, or is it time for
> injector overhaul?
>
> Peter
> --
> "The truth is working in television is not very glamorous at all. I just
go
> home on my own at night and sit alone and eat crisps."
>
>
#35
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
I think you're splitting hairs here, you've got a diesel, right? Well, most
diesels produce rather a nasty amount of smoke when floored at low revs.
Other than that, you might want to check your vacuum lines to make sure you
get all that precious air in. Cleaning injectors at your mileage? A waste of
money in my opinion. Cleaning your MAF is probably more to the point, but
then again, if you look at your consumption figures and they're no different
from when car was new I'd suggest there's nothing wrong in that department,
either.
JP Roberts
P.S.: Want a cleaner car? Go petrol or buy newer diesel engine with particle
filter.
"AstraVanMan" <Off@WithThanks.com> escribió en el mensaje
news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> It doesn't do it massive amounts (not that I can see in the mirror from
the
> driver's seat) but a mate of mine has said that it smokes quite a bit, and
> that it can be thick and black (yup, it's a diesel!).
>
> Obviously it's the sort of thing you notice more at night than in
daylight,
> but this morning when leaving for work (engine had only been running a
> couple of minutes up to this point btw) pulling away not particularly
> quickly resulted in not particularly thick (but still noticeable) smoke in
> the car behind's headlights. Obviously darkness and headlights do tend to
> emphasise any smoke coming out of any car's exhaust though.
>
> My question is this - does my engine (5-cylinder 140bhp 2.5TDI) have a MAF
> sensor, and is this easy enough to take out and clean (should this be
> neccessary), and if that's all ok, how much should I expect to have to pay
> to get the injectors ultrasonically cleaned.
>
> And is there much variation on the quality of ultrasonic cleaning services
> available (I don't want some cowboys ing them up) or is it a
> straightforward job that the machine takes care of with not much chance of
> anything going wrong?
>
> Btw, the car has just short of 127k on the clock, and has been regularly
> serviced all its life (every 10k up to 50k at audi main delaer, then every
> 6k up to 94k with a new air filter and fuel filter every time, then at
105k,
> 114k, 125k, with one new air filter at 114k and a new fuel filter at
125k).
> So I wouldn't say it's been neglected, though I have worried a little
about
> the time I've left it between oil changes (though it's been largely
motorway
> use) and the mileage the laster air filter and fuel filter did before
> changing (20k and 30k respectively). Am I worrying about nothing on these
> points? Is it the MAF sensor that needs cleaning, or is it time for
> injector overhaul?
>
> Peter
> --
> "The truth is working in television is not very glamorous at all. I just
go
> home on my own at night and sit alone and eat crisps."
>
>
diesels produce rather a nasty amount of smoke when floored at low revs.
Other than that, you might want to check your vacuum lines to make sure you
get all that precious air in. Cleaning injectors at your mileage? A waste of
money in my opinion. Cleaning your MAF is probably more to the point, but
then again, if you look at your consumption figures and they're no different
from when car was new I'd suggest there's nothing wrong in that department,
either.
JP Roberts
P.S.: Want a cleaner car? Go petrol or buy newer diesel engine with particle
filter.
"AstraVanMan" <Off@WithThanks.com> escribió en el mensaje
news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> It doesn't do it massive amounts (not that I can see in the mirror from
the
> driver's seat) but a mate of mine has said that it smokes quite a bit, and
> that it can be thick and black (yup, it's a diesel!).
>
> Obviously it's the sort of thing you notice more at night than in
daylight,
> but this morning when leaving for work (engine had only been running a
> couple of minutes up to this point btw) pulling away not particularly
> quickly resulted in not particularly thick (but still noticeable) smoke in
> the car behind's headlights. Obviously darkness and headlights do tend to
> emphasise any smoke coming out of any car's exhaust though.
>
> My question is this - does my engine (5-cylinder 140bhp 2.5TDI) have a MAF
> sensor, and is this easy enough to take out and clean (should this be
> neccessary), and if that's all ok, how much should I expect to have to pay
> to get the injectors ultrasonically cleaned.
>
> And is there much variation on the quality of ultrasonic cleaning services
> available (I don't want some cowboys ing them up) or is it a
> straightforward job that the machine takes care of with not much chance of
> anything going wrong?
>
> Btw, the car has just short of 127k on the clock, and has been regularly
> serviced all its life (every 10k up to 50k at audi main delaer, then every
> 6k up to 94k with a new air filter and fuel filter every time, then at
105k,
> 114k, 125k, with one new air filter at 114k and a new fuel filter at
125k).
> So I wouldn't say it's been neglected, though I have worried a little
about
> the time I've left it between oil changes (though it's been largely
motorway
> use) and the mileage the laster air filter and fuel filter did before
> changing (20k and 30k respectively). Am I worrying about nothing on these
> points? Is it the MAF sensor that needs cleaning, or is it time for
> injector overhaul?
>
> Peter
> --
> "The truth is working in television is not very glamorous at all. I just
go
> home on my own at night and sit alone and eat crisps."
>
>
#36
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote in message
news:2slp91F1n081oU1@uni-berlin.de...
> Tim (Remove NOSPAM. wrote:
> > "AstraVanMan" <Off@WithThanks.com> wrote in message
> > news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> >> It doesn't do it massive amounts (not that I can see in the mirror
> >> from the driver's seat) but a mate of mine has said that it smokes
> >> quite a bit, and that it can be thick and black (yup, it's a
> >> diesel!).
> >>
> >> Obviously it's the sort of thing you notice more at night than in
> >> daylight, but this morning when leaving for work (engine had only
> >> been running a couple of minutes up to this point btw) pulling away
> >> not particularly quickly resulted in not particularly thick (but
> >> still noticeable) smoke in the car behind's headlights. Obviously
> >> darkness and headlights do tend to emphasise any smoke coming out
> of
> >> any car's exhaust though.
> >>
> >> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
> have
> >> a MAF sensor, and is this easy enough to take out and clean (should
> >> this be neccessary), and if that's all ok, how much should I expect
> >> to have to pay to get the injectors ultrasonically cleaned.
> >>
> >
> > If you have power loss and no smoke then in typical VAG fashion the
> > MAF is buggered. If not then the MAF is fine- you wont get excess
> > smoke from a faulty MAF.
> >
> > At 125k or so the injectors are well past it-
>
> They really shouldn't be, although they could be. I've never had a
> general wear or maintainance problem with them at this mileage on a
> modern engine although the very occasional one does actually fail in
> some way.
>
>
>
> have them overhauled if
> > it is getting abit smokey- likewise clean out the EGR system, and if
> > possible blank it off- this is a major cause of excess smoke.
>
> Yes, all those vacuum operated valves which restrict air flow etc and
> which rely on small capillary tubes are a potential nightmare. I've
> long rendered my Isuzu's system inoperable due to problems. My Toyota
> OTOH has been no bother in this area, neither have the Nissans. Yet.
>
> Huw
Injectors are past their best at 80k. At 125k they'd be shot. You dont
notice the fall off in smoothness, and performance until you fit a new /
recon-ed set.
Tim..
#37
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote in message
news:2slp91F1n081oU1@uni-berlin.de...
> Tim (Remove NOSPAM. wrote:
> > "AstraVanMan" <Off@WithThanks.com> wrote in message
> > news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> >> It doesn't do it massive amounts (not that I can see in the mirror
> >> from the driver's seat) but a mate of mine has said that it smokes
> >> quite a bit, and that it can be thick and black (yup, it's a
> >> diesel!).
> >>
> >> Obviously it's the sort of thing you notice more at night than in
> >> daylight, but this morning when leaving for work (engine had only
> >> been running a couple of minutes up to this point btw) pulling away
> >> not particularly quickly resulted in not particularly thick (but
> >> still noticeable) smoke in the car behind's headlights. Obviously
> >> darkness and headlights do tend to emphasise any smoke coming out
> of
> >> any car's exhaust though.
> >>
> >> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
> have
> >> a MAF sensor, and is this easy enough to take out and clean (should
> >> this be neccessary), and if that's all ok, how much should I expect
> >> to have to pay to get the injectors ultrasonically cleaned.
> >>
> >
> > If you have power loss and no smoke then in typical VAG fashion the
> > MAF is buggered. If not then the MAF is fine- you wont get excess
> > smoke from a faulty MAF.
> >
> > At 125k or so the injectors are well past it-
>
> They really shouldn't be, although they could be. I've never had a
> general wear or maintainance problem with them at this mileage on a
> modern engine although the very occasional one does actually fail in
> some way.
>
>
>
> have them overhauled if
> > it is getting abit smokey- likewise clean out the EGR system, and if
> > possible blank it off- this is a major cause of excess smoke.
>
> Yes, all those vacuum operated valves which restrict air flow etc and
> which rely on small capillary tubes are a potential nightmare. I've
> long rendered my Isuzu's system inoperable due to problems. My Toyota
> OTOH has been no bother in this area, neither have the Nissans. Yet.
>
> Huw
Injectors are past their best at 80k. At 125k they'd be shot. You dont
notice the fall off in smoothness, and performance until you fit a new /
recon-ed set.
Tim..
#38
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Yvan wrote:
> Nedavno Huw pise:
>
>> cheaper, is a litre of ATF [automatic transmission fluid] for every
>> 20 gallons of diesel in the tank. This is only needed once [a year
>> perhaps] and, in the case of ATF, will take the consumption of a
>> tankfull or two to work, but work it will.
>
>
> Can ATF be added in a petrol engine for injector cleaning (NF
> 5-cylinder
> 2.3 engine)?
I have absolutely no idea. Unless someone comes up with a positive
report, I would *not* try it if I were you.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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> Nedavno Huw pise:
>
>> cheaper, is a litre of ATF [automatic transmission fluid] for every
>> 20 gallons of diesel in the tank. This is only needed once [a year
>> perhaps] and, in the case of ATF, will take the consumption of a
>> tankfull or two to work, but work it will.
>
>
> Can ATF be added in a petrol engine for injector cleaning (NF
> 5-cylinder
> 2.3 engine)?
I have absolutely no idea. Unless someone comes up with a positive
report, I would *not* try it if I were you.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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#39
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Yvan wrote:
> Nedavno Huw pise:
>
>> cheaper, is a litre of ATF [automatic transmission fluid] for every
>> 20 gallons of diesel in the tank. This is only needed once [a year
>> perhaps] and, in the case of ATF, will take the consumption of a
>> tankfull or two to work, but work it will.
>
>
> Can ATF be added in a petrol engine for injector cleaning (NF
> 5-cylinder
> 2.3 engine)?
I have absolutely no idea. Unless someone comes up with a positive
report, I would *not* try it if I were you.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/04
> Nedavno Huw pise:
>
>> cheaper, is a litre of ATF [automatic transmission fluid] for every
>> 20 gallons of diesel in the tank. This is only needed once [a year
>> perhaps] and, in the case of ATF, will take the consumption of a
>> tankfull or two to work, but work it will.
>
>
> Can ATF be added in a petrol engine for injector cleaning (NF
> 5-cylinder
> 2.3 engine)?
I have absolutely no idea. Unless someone comes up with a positive
report, I would *not* try it if I were you.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/04
#40
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Tim (Remove NOSPAM. wrote:
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote in message
> news:2slp91F1n081oU1@uni-berlin.de...
>> Tim (Remove NOSPAM. wrote:
>>> "AstraVanMan" <Off@WithThanks.com> wrote in message
>>> news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
>>>> It doesn't do it massive amounts (not that I can see in the
mirror
>>>> from the driver's seat) but a mate of mine has said that it
smokes
>>>> quite a bit, and that it can be thick and black (yup, it's a
>>>> diesel!).
>>>>
>>>> Obviously it's the sort of thing you notice more at night than in
>>>> daylight, but this morning when leaving for work (engine had only
>>>> been running a couple of minutes up to this point btw) pulling
away
>>>> not particularly quickly resulted in not particularly thick (but
>>>> still noticeable) smoke in the car behind's headlights.
Obviously
>>>> darkness and headlights do tend to emphasise any smoke coming out
>>>> of any car's exhaust though.
>>>>
>>>> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
>>>> have a MAF sensor, and is this easy enough to take out and clean
>>>> (should this be neccessary), and if that's all ok, how much
should
>>>> I expect to have to pay to get the injectors ultrasonically
>>>> cleaned.
>>>>
>>>
>>> If you have power loss and no smoke then in typical VAG fashion
the
>>> MAF is buggered. If not then the MAF is fine- you wont get excess
>>> smoke from a faulty MAF.
>>>
>>> At 125k or so the injectors are well past it-
>>
>> They really shouldn't be, although they could be. I've never had a
>> general wear or maintainance problem with them at this mileage on a
>> modern engine although the very occasional one does actually fail
in
>> some way.
>>
>>
>>
>> have them overhauled if
>>> it is getting abit smokey- likewise clean out the EGR system, and
if
>>> possible blank it off- this is a major cause of excess smoke.
>>
>> Yes, all those vacuum operated valves which restrict air flow etc
and
>> which rely on small capillary tubes are a potential nightmare. I've
>> long rendered my Isuzu's system inoperable due to problems. My
Toyota
>> OTOH has been no bother in this area, neither have the Nissans.
Yet.
>>
>> Huw
>
>
> Injectors are past their best at 80k. At 125k they'd be shot. You
dont
> notice the fall off in smoothness, and performance until you fit a
> new / recon-ed set.
>
> Tim..
Not my experience I'm afraid. All I can go on is my experience, but it
does cover a huge number of engines. Within reason, the more an
injector is used, the smoother the combustion, though ultimately the
injectors do wear of course. I have changed several sets of injectors
[before I started to use ATF] with either no result, or twice when the
proffessionaly reconditioned injectors were worse than the original
ones with over 100k on them.
Similarly with injector pumps. Between my own fleet and indirectly
maintaining a large park of other vehicles, I find quite a few
[mainly] rotary injector pumps that need maintainance/repair every
year. The other day one of a fleet of Nissan vans came in as a result
of the driver opening the fuelling out and upsetting something
internally. Sent it away to one of the most reputable frachise
specialists in the Country and it came back exactly the same, with
shovel loads of soot coming out of the exhaust. Second time lucky
though.
To put some figures on injector wear, I have found that the average
use before an injector actually needs some work done to it is about
every 450,000,000 cycles. This equates to about 150,000 miles on
average I would have thought.
I have one Mitsubishi Shogun with the old 2.5 indirect injection
engine presently that has led a very hard life, with much heavy towing
and its share of two minute runs, and which has never had its fuel
system touched apart from filter changes. 145,000 and it smokes and
runs no worse than new. Unless an injector suffers a catastrophic
failure, I can see no reason to change or touch the injectors any time
soon.
My moto has always been, "if it ain't broke, don't fix it, but if it
is broke, get the job done quick"
By the way, My BMW 3.0 diesel needed a single new injector at around
15,000 miles.
Huw
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> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote in message
> news:2slp91F1n081oU1@uni-berlin.de...
>> Tim (Remove NOSPAM. wrote:
>>> "AstraVanMan" <Off@WithThanks.com> wrote in message
>>> news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
>>>> It doesn't do it massive amounts (not that I can see in the
mirror
>>>> from the driver's seat) but a mate of mine has said that it
smokes
>>>> quite a bit, and that it can be thick and black (yup, it's a
>>>> diesel!).
>>>>
>>>> Obviously it's the sort of thing you notice more at night than in
>>>> daylight, but this morning when leaving for work (engine had only
>>>> been running a couple of minutes up to this point btw) pulling
away
>>>> not particularly quickly resulted in not particularly thick (but
>>>> still noticeable) smoke in the car behind's headlights.
Obviously
>>>> darkness and headlights do tend to emphasise any smoke coming out
>>>> of any car's exhaust though.
>>>>
>>>> My question is this - does my engine (5-cylinder 140bhp 2.5TDI)
>>>> have a MAF sensor, and is this easy enough to take out and clean
>>>> (should this be neccessary), and if that's all ok, how much
should
>>>> I expect to have to pay to get the injectors ultrasonically
>>>> cleaned.
>>>>
>>>
>>> If you have power loss and no smoke then in typical VAG fashion
the
>>> MAF is buggered. If not then the MAF is fine- you wont get excess
>>> smoke from a faulty MAF.
>>>
>>> At 125k or so the injectors are well past it-
>>
>> They really shouldn't be, although they could be. I've never had a
>> general wear or maintainance problem with them at this mileage on a
>> modern engine although the very occasional one does actually fail
in
>> some way.
>>
>>
>>
>> have them overhauled if
>>> it is getting abit smokey- likewise clean out the EGR system, and
if
>>> possible blank it off- this is a major cause of excess smoke.
>>
>> Yes, all those vacuum operated valves which restrict air flow etc
and
>> which rely on small capillary tubes are a potential nightmare. I've
>> long rendered my Isuzu's system inoperable due to problems. My
Toyota
>> OTOH has been no bother in this area, neither have the Nissans.
Yet.
>>
>> Huw
>
>
> Injectors are past their best at 80k. At 125k they'd be shot. You
dont
> notice the fall off in smoothness, and performance until you fit a
> new / recon-ed set.
>
> Tim..
Not my experience I'm afraid. All I can go on is my experience, but it
does cover a huge number of engines. Within reason, the more an
injector is used, the smoother the combustion, though ultimately the
injectors do wear of course. I have changed several sets of injectors
[before I started to use ATF] with either no result, or twice when the
proffessionaly reconditioned injectors were worse than the original
ones with over 100k on them.
Similarly with injector pumps. Between my own fleet and indirectly
maintaining a large park of other vehicles, I find quite a few
[mainly] rotary injector pumps that need maintainance/repair every
year. The other day one of a fleet of Nissan vans came in as a result
of the driver opening the fuelling out and upsetting something
internally. Sent it away to one of the most reputable frachise
specialists in the Country and it came back exactly the same, with
shovel loads of soot coming out of the exhaust. Second time lucky
though.
To put some figures on injector wear, I have found that the average
use before an injector actually needs some work done to it is about
every 450,000,000 cycles. This equates to about 150,000 miles on
average I would have thought.
I have one Mitsubishi Shogun with the old 2.5 indirect injection
engine presently that has led a very hard life, with much heavy towing
and its share of two minute runs, and which has never had its fuel
system touched apart from filter changes. 145,000 and it smokes and
runs no worse than new. Unless an injector suffers a catastrophic
failure, I can see no reason to change or touch the injectors any time
soon.
My moto has always been, "if it ain't broke, don't fix it, but if it
is broke, get the job done quick"
By the way, My BMW 3.0 diesel needed a single new injector at around
15,000 miles.
Huw
---
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