A6 2.5TDI Smoking + ultrasonically cleaning injectors
#21
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
AstraVanMan wrote:
>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
and
>>> the timing properly checked on their fancy computer equipment. Is
>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>> different way?
>>
>> No, I mean taking the injectors out to spray and pressure test
them.
>> Crack-off pressure falls off over time and also fuel volume
injected
>> gradually increases, usually to the actual benefit of less noise
and
>> more power to a point. That point is where soot emissions become
>> unacceptable to the extent that either you are concerned or it
fails
>> the MOT soot test.
>
> Yeah, I think the fact that it's quite a freely revving diesel
engine
> means that the power is easily accessible and it's quite easy for it
> to overfuel a bit.
It is a diesel engine and that should not happen at any revs. It is
governed and turbocharged and, in your case, electronically managed.
It should not smoke *significantly* at any revs, though it could give
the occassional puff when suddenly accellerated from low revs.
To gauge what is 'significant', take it for that smoke test.
>
>> I don't know whether your engine is a standard unit or a
>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>> concern. But you never know. There is a bit of luck involved with
>> running any engine.
>
> It's just a standard one. Proper old-skool design, dating back to
> 1991!
Not in an A6 it's not!
>
>> If you are still concerned after doing the cheap additive trick as
I
>> described, then take it to an MOT station and ask them to actually
do
>> a soot test. They will be able to give you a proper measure of the
>> soot to either confirm your anxiety or take a load off your mind.
>
> As far as MOT soot tests goes it's fine - it's only when it's under
> load under hard acceleration, or actually during acceleration
> generally, that it smokes a bit. I'll give the ATF a try as you've
> suggested and let you know how I get on.
>
> Anyway, cheers for all the advice. Good, this internet thing,
innit?
> I'd happily repay the favour if you ever need any help with talking
> ***** or telling mildy amusing stories.
>
Thank you I'm sure.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
and
>>> the timing properly checked on their fancy computer equipment. Is
>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>> different way?
>>
>> No, I mean taking the injectors out to spray and pressure test
them.
>> Crack-off pressure falls off over time and also fuel volume
injected
>> gradually increases, usually to the actual benefit of less noise
and
>> more power to a point. That point is where soot emissions become
>> unacceptable to the extent that either you are concerned or it
fails
>> the MOT soot test.
>
> Yeah, I think the fact that it's quite a freely revving diesel
engine
> means that the power is easily accessible and it's quite easy for it
> to overfuel a bit.
It is a diesel engine and that should not happen at any revs. It is
governed and turbocharged and, in your case, electronically managed.
It should not smoke *significantly* at any revs, though it could give
the occassional puff when suddenly accellerated from low revs.
To gauge what is 'significant', take it for that smoke test.
>
>> I don't know whether your engine is a standard unit or a
>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>> concern. But you never know. There is a bit of luck involved with
>> running any engine.
>
> It's just a standard one. Proper old-skool design, dating back to
> 1991!
Not in an A6 it's not!
>
>> If you are still concerned after doing the cheap additive trick as
I
>> described, then take it to an MOT station and ask them to actually
do
>> a soot test. They will be able to give you a proper measure of the
>> soot to either confirm your anxiety or take a load off your mind.
>
> As far as MOT soot tests goes it's fine - it's only when it's under
> load under hard acceleration, or actually during acceleration
> generally, that it smokes a bit. I'll give the ATF a try as you've
> suggested and let you know how I get on.
>
> Anyway, cheers for all the advice. Good, this internet thing,
innit?
> I'd happily repay the favour if you ever need any help with talking
> ***** or telling mildy amusing stories.
>
Thank you I'm sure.
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
#22
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
On Wed, 6 Oct 2004 23:17:27 +0100, Huw <hedydd[nospam]@tiscali.co.uk>
wrote:
> AstraVanMan wrote:
>>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
> and
>>>> the timing properly checked on their fancy computer equipment. Is
>>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>>> different way?
>>>
>>> No, I mean taking the injectors out to spray and pressure test
> them.
>>> Crack-off pressure falls off over time and also fuel volume
> injected
>>> gradually increases, usually to the actual benefit of less noise
> and
>>> more power to a point. That point is where soot emissions become
>>> unacceptable to the extent that either you are concerned or it
> fails
>>> the MOT soot test.
>>
>> Yeah, I think the fact that it's quite a freely revving diesel
> engine
>> means that the power is easily accessible and it's quite easy for it
>> to overfuel a bit.
>
> It is a diesel engine and that should not happen at any revs. It is
> governed and turbocharged and, in your case, electronically managed.
> It should not smoke *significantly* at any revs, though it could give
> the occassional puff when suddenly accellerated from low revs.
> To gauge what is 'significant', take it for that smoke test.
>
>
>>
>>> I don't know whether your engine is a standard unit or a
>>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>>> concern. But you never know. There is a bit of luck involved with
>>> running any engine.
>>
>> It's just a standard one. Proper old-skool design, dating back to
>> 1991!
>
> Not in an A6 it's not!
>
>
>>
>>> If you are still concerned after doing the cheap additive trick as
> I
>>> described, then take it to an MOT station and ask them to actually
> do
>>> a soot test. They will be able to give you a proper measure of the
>>> soot to either confirm your anxiety or take a load off your mind.
>>
>> As far as MOT soot tests goes it's fine - it's only when it's under
>> load under hard acceleration, or actually during acceleration
>> generally, that it smokes a bit. I'll give the ATF a try as you've
>> suggested and let you know how I get on.
>>
>> Anyway, cheers for all the advice. Good, this internet thing,
> innit?
>> I'd happily repay the favour if you ever need any help with talking
>> ***** or telling mildy amusing stories.
>>
>
> Thank you I'm sure.
>
> Huw
>
>
>
The other obvious thing to check is the actual boost pressure. If that's
fine then check the injectors.
wrote:
> AstraVanMan wrote:
>>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
> and
>>>> the timing properly checked on their fancy computer equipment. Is
>>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>>> different way?
>>>
>>> No, I mean taking the injectors out to spray and pressure test
> them.
>>> Crack-off pressure falls off over time and also fuel volume
> injected
>>> gradually increases, usually to the actual benefit of less noise
> and
>>> more power to a point. That point is where soot emissions become
>>> unacceptable to the extent that either you are concerned or it
> fails
>>> the MOT soot test.
>>
>> Yeah, I think the fact that it's quite a freely revving diesel
> engine
>> means that the power is easily accessible and it's quite easy for it
>> to overfuel a bit.
>
> It is a diesel engine and that should not happen at any revs. It is
> governed and turbocharged and, in your case, electronically managed.
> It should not smoke *significantly* at any revs, though it could give
> the occassional puff when suddenly accellerated from low revs.
> To gauge what is 'significant', take it for that smoke test.
>
>
>>
>>> I don't know whether your engine is a standard unit or a
>>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>>> concern. But you never know. There is a bit of luck involved with
>>> running any engine.
>>
>> It's just a standard one. Proper old-skool design, dating back to
>> 1991!
>
> Not in an A6 it's not!
>
>
>>
>>> If you are still concerned after doing the cheap additive trick as
> I
>>> described, then take it to an MOT station and ask them to actually
> do
>>> a soot test. They will be able to give you a proper measure of the
>>> soot to either confirm your anxiety or take a load off your mind.
>>
>> As far as MOT soot tests goes it's fine - it's only when it's under
>> load under hard acceleration, or actually during acceleration
>> generally, that it smokes a bit. I'll give the ATF a try as you've
>> suggested and let you know how I get on.
>>
>> Anyway, cheers for all the advice. Good, this internet thing,
> innit?
>> I'd happily repay the favour if you ever need any help with talking
>> ***** or telling mildy amusing stories.
>>
>
> Thank you I'm sure.
>
> Huw
>
>
>
The other obvious thing to check is the actual boost pressure. If that's
fine then check the injectors.
#23
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
On Wed, 6 Oct 2004 23:17:27 +0100, Huw <hedydd[nospam]@tiscali.co.uk>
wrote:
> AstraVanMan wrote:
>>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
> and
>>>> the timing properly checked on their fancy computer equipment. Is
>>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>>> different way?
>>>
>>> No, I mean taking the injectors out to spray and pressure test
> them.
>>> Crack-off pressure falls off over time and also fuel volume
> injected
>>> gradually increases, usually to the actual benefit of less noise
> and
>>> more power to a point. That point is where soot emissions become
>>> unacceptable to the extent that either you are concerned or it
> fails
>>> the MOT soot test.
>>
>> Yeah, I think the fact that it's quite a freely revving diesel
> engine
>> means that the power is easily accessible and it's quite easy for it
>> to overfuel a bit.
>
> It is a diesel engine and that should not happen at any revs. It is
> governed and turbocharged and, in your case, electronically managed.
> It should not smoke *significantly* at any revs, though it could give
> the occassional puff when suddenly accellerated from low revs.
> To gauge what is 'significant', take it for that smoke test.
>
>
>>
>>> I don't know whether your engine is a standard unit or a
>>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>>> concern. But you never know. There is a bit of luck involved with
>>> running any engine.
>>
>> It's just a standard one. Proper old-skool design, dating back to
>> 1991!
>
> Not in an A6 it's not!
>
>
>>
>>> If you are still concerned after doing the cheap additive trick as
> I
>>> described, then take it to an MOT station and ask them to actually
> do
>>> a soot test. They will be able to give you a proper measure of the
>>> soot to either confirm your anxiety or take a load off your mind.
>>
>> As far as MOT soot tests goes it's fine - it's only when it's under
>> load under hard acceleration, or actually during acceleration
>> generally, that it smokes a bit. I'll give the ATF a try as you've
>> suggested and let you know how I get on.
>>
>> Anyway, cheers for all the advice. Good, this internet thing,
> innit?
>> I'd happily repay the favour if you ever need any help with talking
>> ***** or telling mildy amusing stories.
>>
>
> Thank you I'm sure.
>
> Huw
>
>
>
The other obvious thing to check is the actual boost pressure. If that's
fine then check the injectors.
wrote:
> AstraVanMan wrote:
>>>> The cambelt was done at 110k (17k ago) at a VW/Audi specialist,
> and
>>>> the timing properly checked on their fancy computer equipment. Is
>>>> that what you mean by calibrated (wrt timing) - or calibrated in a
>>>> different way?
>>>
>>> No, I mean taking the injectors out to spray and pressure test
> them.
>>> Crack-off pressure falls off over time and also fuel volume
> injected
>>> gradually increases, usually to the actual benefit of less noise
> and
>>> more power to a point. That point is where soot emissions become
>>> unacceptable to the extent that either you are concerned or it
> fails
>>> the MOT soot test.
>>
>> Yeah, I think the fact that it's quite a freely revving diesel
> engine
>> means that the power is easily accessible and it's quite easy for it
>> to overfuel a bit.
>
> It is a diesel engine and that should not happen at any revs. It is
> governed and turbocharged and, in your case, electronically managed.
> It should not smoke *significantly* at any revs, though it could give
> the occassional puff when suddenly accellerated from low revs.
> To gauge what is 'significant', take it for that smoke test.
>
>
>>
>>> I don't know whether your engine is a standard unit or a
>>> Pumpe-deuse. Either way, your mileage should not cause this kind of
>>> concern. But you never know. There is a bit of luck involved with
>>> running any engine.
>>
>> It's just a standard one. Proper old-skool design, dating back to
>> 1991!
>
> Not in an A6 it's not!
>
>
>>
>>> If you are still concerned after doing the cheap additive trick as
> I
>>> described, then take it to an MOT station and ask them to actually
> do
>>> a soot test. They will be able to give you a proper measure of the
>>> soot to either confirm your anxiety or take a load off your mind.
>>
>> As far as MOT soot tests goes it's fine - it's only when it's under
>> load under hard acceleration, or actually during acceleration
>> generally, that it smokes a bit. I'll give the ATF a try as you've
>> suggested and let you know how I get on.
>>
>> Anyway, cheers for all the advice. Good, this internet thing,
> innit?
>> I'd happily repay the favour if you ever need any help with talking
>> ***** or telling mildy amusing stories.
>>
>
> Thank you I'm sure.
>
> Huw
>
>
>
The other obvious thing to check is the actual boost pressure. If that's
fine then check the injectors.
#24
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
In message <2sj9ftF1l7im2U1@uni-berlin.de>
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
> AstraVanMan wrote:
>> >> I don't know whether your engine is a standard unit or a
> >> Pumpe-deuse. Either way, your mileage should not cause this kind of
> >> concern. But you never know. There is a bit of luck involved with
> >> running any engine.
> >
> > It's just a standard one. Proper old-skool design, dating back to
> > 1991!
>
> Not in an A6 it's not!
What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
engine isn't 'proper old-skool design', or that it doesn't date back to
1991?
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily')
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
> AstraVanMan wrote:
>> >> I don't know whether your engine is a standard unit or a
> >> Pumpe-deuse. Either way, your mileage should not cause this kind of
> >> concern. But you never know. There is a bit of luck involved with
> >> running any engine.
> >
> > It's just a standard one. Proper old-skool design, dating back to
> > 1991!
>
> Not in an A6 it's not!
What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
engine isn't 'proper old-skool design', or that it doesn't date back to
1991?
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily')
#25
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
In message <2sj9ftF1l7im2U1@uni-berlin.de>
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
> AstraVanMan wrote:
>> >> I don't know whether your engine is a standard unit or a
> >> Pumpe-deuse. Either way, your mileage should not cause this kind of
> >> concern. But you never know. There is a bit of luck involved with
> >> running any engine.
> >
> > It's just a standard one. Proper old-skool design, dating back to
> > 1991!
>
> Not in an A6 it's not!
What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
engine isn't 'proper old-skool design', or that it doesn't date back to
1991?
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily')
"Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
> AstraVanMan wrote:
>> >> I don't know whether your engine is a standard unit or a
> >> Pumpe-deuse. Either way, your mileage should not cause this kind of
> >> concern. But you never know. There is a bit of luck involved with
> >> running any engine.
> >
> > It's just a standard one. Proper old-skool design, dating back to
> > 1991!
>
> Not in an A6 it's not!
What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
engine isn't 'proper old-skool design', or that it doesn't date back to
1991?
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily')
#26
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Peter Bell wrote:
> In message <2sj9ftF1l7im2U1@uni-berlin.de>
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
>
>> AstraVanMan wrote:
>>>>> I don't know whether your engine is a standard unit or a
>>>> Pumpe-deuse. Either way, your mileage should not cause this kind
of
>>>> concern. But you never know. There is a bit of luck involved with
>>>> running any engine.
>>>
>>> It's just a standard one. Proper old-skool design, dating back to
>>> 1991!
>>
>> Not in an A6 it's not!
>
> What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
> engine isn't 'proper old-skool design', or that it doesn't date back
> to 1991?
I am saying that in the A6 it has the emmissionised version of the
engine. I do not have intimate knowedge of this particular version but
I suspect it differs from earlier versions substantially, depending on
model year, by having electronic control of the [higher pressure Bosch
VP3] injector pump. Latest versions *might* even have switched to PD
which is different again.
Now, I am not certain of any of this because I have lost contact with
things VW in recent years, but whatever version is involved, it does
not alter the jist of my previous posts as the engine version is
largely irrellevant to basic diesel operation.
And yes, someone said to check boost pressure. Well worth checking at
some point, though I personally have never had a problem with this
over many engines. There can be problems with air pipes sometimes
delaminating internally which can restrict air flow. That's another
possibility. In fact there are a heck of a lot of possibilities, even
that there is nothing wrong at all.
Huw
---
Outgoing mail is certified Virus Free.
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> In message <2sj9ftF1l7im2U1@uni-berlin.de>
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
>
>> AstraVanMan wrote:
>>>>> I don't know whether your engine is a standard unit or a
>>>> Pumpe-deuse. Either way, your mileage should not cause this kind
of
>>>> concern. But you never know. There is a bit of luck involved with
>>>> running any engine.
>>>
>>> It's just a standard one. Proper old-skool design, dating back to
>>> 1991!
>>
>> Not in an A6 it's not!
>
> What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
> engine isn't 'proper old-skool design', or that it doesn't date back
> to 1991?
I am saying that in the A6 it has the emmissionised version of the
engine. I do not have intimate knowedge of this particular version but
I suspect it differs from earlier versions substantially, depending on
model year, by having electronic control of the [higher pressure Bosch
VP3] injector pump. Latest versions *might* even have switched to PD
which is different again.
Now, I am not certain of any of this because I have lost contact with
things VW in recent years, but whatever version is involved, it does
not alter the jist of my previous posts as the engine version is
largely irrellevant to basic diesel operation.
And yes, someone said to check boost pressure. Well worth checking at
some point, though I personally have never had a problem with this
over many engines. There can be problems with air pipes sometimes
delaminating internally which can restrict air flow. That's another
possibility. In fact there are a heck of a lot of possibilities, even
that there is nothing wrong at all.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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#27
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
Peter Bell wrote:
> In message <2sj9ftF1l7im2U1@uni-berlin.de>
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
>
>> AstraVanMan wrote:
>>>>> I don't know whether your engine is a standard unit or a
>>>> Pumpe-deuse. Either way, your mileage should not cause this kind
of
>>>> concern. But you never know. There is a bit of luck involved with
>>>> running any engine.
>>>
>>> It's just a standard one. Proper old-skool design, dating back to
>>> 1991!
>>
>> Not in an A6 it's not!
>
> What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
> engine isn't 'proper old-skool design', or that it doesn't date back
> to 1991?
I am saying that in the A6 it has the emmissionised version of the
engine. I do not have intimate knowedge of this particular version but
I suspect it differs from earlier versions substantially, depending on
model year, by having electronic control of the [higher pressure Bosch
VP3] injector pump. Latest versions *might* even have switched to PD
which is different again.
Now, I am not certain of any of this because I have lost contact with
things VW in recent years, but whatever version is involved, it does
not alter the jist of my previous posts as the engine version is
largely irrellevant to basic diesel operation.
And yes, someone said to check boost pressure. Well worth checking at
some point, though I personally have never had a problem with this
over many engines. There can be problems with air pipes sometimes
delaminating internally which can restrict air flow. That's another
possibility. In fact there are a heck of a lot of possibilities, even
that there is nothing wrong at all.
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
> In message <2sj9ftF1l7im2U1@uni-berlin.de>
> "Huw" <hedydd[nospam]@tiscali.co.uk> wrote:
>
>> AstraVanMan wrote:
>>>>> I don't know whether your engine is a standard unit or a
>>>> Pumpe-deuse. Either way, your mileage should not cause this kind
of
>>>> concern. But you never know. There is a bit of luck involved with
>>>> running any engine.
>>>
>>> It's just a standard one. Proper old-skool design, dating back to
>>> 1991!
>>
>> Not in an A6 it's not!
>
> What's not? Are you saying that the 2.5l in-line 5 cylinder diesel
> engine isn't 'proper old-skool design', or that it doesn't date back
> to 1991?
I am saying that in the A6 it has the emmissionised version of the
engine. I do not have intimate knowedge of this particular version but
I suspect it differs from earlier versions substantially, depending on
model year, by having electronic control of the [higher pressure Bosch
VP3] injector pump. Latest versions *might* even have switched to PD
which is different again.
Now, I am not certain of any of this because I have lost contact with
things VW in recent years, but whatever version is involved, it does
not alter the jist of my previous posts as the engine version is
largely irrellevant to basic diesel operation.
And yes, someone said to check boost pressure. Well worth checking at
some point, though I personally have never had a problem with this
over many engines. There can be problems with air pipes sometimes
delaminating internally which can restrict air flow. That's another
possibility. In fact there are a heck of a lot of possibilities, even
that there is nothing wrong at all.
Huw
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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#28
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
"AstraVanMan" <Off@WithThanks.com> wrote in message
news:ANX8d.2229$P25.1976@newsfe3-gui.ntli.net...
> It doesn't do it massive amounts (not that I can see in the mirror from
the
> driver's seat) but a mate of mine has said that it smokes quite a bit, and
> that it can be thick and black (yup, it's a diesel!).
>
> Obviously it's the sort of thing you notice more at night than in
daylight,
> but this morning when leaving for work (engine had only been running a
> couple of minutes up to this point btw) pulling away not particularly
> quickly resulted in not particularly thick (but still noticeable) smoke in
> the car behind's headlights. Obviously darkness and headlights do tend to
> emphasise any smoke coming out of any car's exhaust though.
>
> My question is this - does my engine (5-cylinder 140bhp 2.5TDI) have a MAF
> sensor, and is this easy enough to take out and clean (should this be
> neccessary), and if that's all ok, how much should I expect to have to pay
> to get the injectors ultrasonically cleaned.
>
If you have power loss and no smoke then in typical VAG fashion the MAF is
buggered. If not then the MAF is fine- you wont get excess smoke from a
faulty MAF.
At 125k or so the injectors are well past it- have them overhauled if it is
getting abit smokey- likewise clean out the EGR system, and if possible
blank it off- this is a major cause of excess smoke.
If you're really going for it, you might hook up a boost gauge and check
what level its at- with age and heat the wastegate springs go weak so you
dont get factory boost- this can (not always) cause abit more smoke than it
should do (with a factory set max fuelling setting)
Tim..
#29
Guest
Posts: n/a
Re: A6 2.5TDI Smoking + ultrasonically cleaning injectors
"AstraVanMan" <Off@WithThanks.com> wrote in message
news:ANX8d.2229$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- 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.
If you're really going for it, you might hook up a boost gauge and check
what level its at- with age and heat the wastegate springs go weak so you
dont get factory boost- this can (not always) cause abit more smoke than it
should do (with a factory set max fuelling setting)
Tim..
#30
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.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/04