Limp mode on motorway, help.

Spiezels

Spiezels

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Morning chaps.

Got a 2.0TDI 140BHP 08 plate.

Never missed a beat since owning but was driving in the motor way just now and it felt like it went into limp mode.

I'll set the scene, in 6th going from 70tickets to 100 or so and power drops. Revs died, not totally so I could maintain about 70 but the power was gone.

Pulled over, turned the engine off, ignition back on, no warning lights at any stage, turned it over again and it was back to normal.

All levels are fine.

Anyone any wiser? Can't hear anything odd, looked under the bonnet can't see anything.

New to Audis so not too sure!

(Only thing I've had done to the car recently is a clarion satnav HU put in. Done by a professional company too.)

Thanks.
 
Classic vnt turbo sticky vanes overboost limp mode caused by carbon build up.

Mr Muscle or strip and clean turbo .
 
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Thanks for the reply. What's the best way to look after it in the meantime? I'm driving across the country this weekend and won't be able to do it till next week.
 
It's overboosting, it shouldn't overboost if you keep the revs under 3000 for the time being until you can get it cleaned

strip and clean to cure it, then let it cool properly before switching the engine off to minimise soot baking itself into the turbo.

can also get it terracleaned every year for around £100, google terraclean
 
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T8DPR said:
It's overboosting, it shouldn't overboost if you keep the revs under 3000 for the time being until you can get it cleaned

strip and clean to cure it, then let it cool properly before switching the engine off to minimise soot baking itself into the turbo.

can also get it terracleaned every year for around £100, google terraclean
Click to expand...
Thanks mate!
 
Happened to me a few weeks ago at the end of a 4 hour run and cleared itself next day. Have done a few shorter runs since and touch wood has not happened again, even when pushing on. Is it possible the egr flow/problems could do this too?
 
The operational egr is very much the problem as the engine is rebreathing its own exhaust soot , causing the hot side of the turbo to coke up .
 
don't want to change the direction of this thread but I must ask the question regarding terraclean. I have seen many testimonials but no actual pictures of the parts cleaned after the procedure. I would really love to see before and after pictures of the vital parts treated to see how much carbon remains after the treatment. I prefer that manual approach as I can see what affected and fix it. Maybe this treatment is great but I am skeptical and maybe it's a hybrid approach with manual cleaning and then terracleaning. Don't know and am not flaming the product. Just some thoughts
 
Gazwould said:
The operational egr is very much the problem as the engine is rebreathing its own exhaust soot , causing the hot side of the turbo to coke up .
Click to expand...

What's the fix here? Cleaning the turbo?
 
I had this problem a couple weeks back, turned out to be a faulty boost sensor causing the overboost.
 
tcardio said:
don't want to change the direction of this thread but I must ask the question regarding terraclean. I have seen many testimonials but no actual pictures of the parts cleaned after the procedure. I would really love to see before and after pictures of the vital parts treated to see how much carbon remains after the treatment. I prefer that manual approach as I can see what affected and fix it. Maybe this treatment is great but I am skeptical and maybe it's a hybrid approach with manual cleaning and then terracleaning. Don't know and am not flaming the product. Just some thoughts
Click to expand...

the reason you wont have seen clean parts afterwards is because they're not removed from the car as part of the cleaning process, terraclean probably should have spent a day with a guinea pig car where they took some parts off, photographed them filthy, refitted them as they are, then terracleaning, then removing them to show the end result, and as that would be a massive job that's probably why they never have, though it would have increased its credibility if they had
 
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a14974aa1ceed178cee8558bff99495d.jpg


Any suggestions on preventative measures then as it looks like the turbo is going.
 
Sounds like either a boost pipe has come off or a faulty MAF / MAF wiring.
 
Will get to the VAG specialist then! Cheers chaps
 
Spiezels said:
Morning chaps.

Got a 2.0TDI 140BHP 08 plate.

Never missed a beat since owning but was driving in the motor way just now and it felt like it went into limp mode.

I'll set the scene, in 6th going from 70tickets to 100 or so and power drops. Revs died, not totally so I could maintain about 70 but the power was gone.

Pulled over, turned the engine off, ignition back on, no warning lights at any stage, turned it over again and it was back to normal.

All levels are fine.

Anyone any wiser? Can't hear anything odd, looked under the bonnet can't see anything.

New to Audis so not too sure!

(Only thing I've had done to the car recently is a clarion satnav HU put in. Done by a professional company too.)

Thanks.
Click to expand...
Hello I'm having the same problem .annoying ... Try getting the codes reset
It may help .ive tried twice thought I had sorted it , but it's came,back
 
Could be any of the above causes. When I had this problem on a Golf TDi, it was the MAF playing up.
If you have the time and not much dosh, go for a manual cleaning by removing the EGR, manifold and turbo and do it properly.
If you don't have the time and do want to pay, have someone diagnose and fix it.
 
Soot1 said:
Could be any of the above causes. When I had this problem on a Golf TDi, it was the MAF playing up.
If you have the time and not much dosh, go for a manual cleaning by removing the EGR, manifold and turbo and do it properly.
If you don't have the time and do want to pay, have someone diagnose and fix it.
Click to expand...
Thanks will do .
 
Ended up taking it to the local VAG specialist, had a bunch of fault codes and it turned out to be a fudged turbo.

Got a new one fitted 2k miles ago.

£900
 
Yeah mate, brand new turbo so it's bang on, all errors gone.
 
Had them cleared a week so far so good .but had them done last month, left the car parked for
A fortnight traveled back from Aberdeen it happened about 5 or 6 times ,so I will see go back to work Wednesday
Was it easy to get your turbo done and who did you take it too
 
Well bit of a ball ache. Car was about 6 months old (to me from dealer up north) when the turbo started playing up.

I was about to go away to Spain with work so took the car to a VAG specialist in London where I live. They rang when I was away few days later and said turbos gone, be £900 for the new turbo and labour so i said do it, to have it ready for my return

Get back to UK, email the dealer I got it from and he says drive it up north I'll check it out and do the work.

But by that time I'd had the work done...

Sooooo long and short, if I'd have waited I could have had it done for free (minus driving 5 hour round trip and leaving car)

Instead I paid out. Live and learn eh. At least it was done by a VAG specialist.

You should look into hybrid turbos n all. Not that I know the difference.
 
If you've a variable vane turbo (VVT) and the vanes 'clog' up then light throttle acceleration on motorways will most certainly give an over-boost and the ECU shuts down; my 1.4TDi A2 was doing exactly this but since cleaning is now perfect - and these are the vanes post cleaning (you don't want to see what they were like before):

P1020253_After_zpsokmx6hjt.jpg
 
Only of the impeller-side but the same crud coating was all over the VVT mechanism:

P1020245_zpsbxu8d9xh.jpg


There is this one partially cleaned:

P1020244_Before_zpsmbvvg3sd.jpg


Limp-mode was always in light throttle applications typically 75mph on the motorway; heavy acceleration not a problem.

Note I purchased the car with the issue, it had done local driving in the main and using the cheapest £s diesel possible: post cleaning I use Shell V-Power Nitro+ diesel and Redex every other tank fill and zero issues...
 
Thank you. For the pics. great to see what's going on
Is it easy too do it yourself. Take turbo off ,,,, I've not done it before.
 
Pjn70 said:
Thank you. For the pics. great to see what's going on
Is it easy too do it yourself. Take turbo off ,,,, I've not done it before.
Click to expand...

On the A2, no, it's a very tight installation so I had the job done locally - it took 8-hours.

Cleaning is not so straight forward as similar to a de-coke much of the debris has to be 'chipped' away, however, mine was the 3rd Audi/VW they'd done that week ALL with the same failure characteristics as mine: the VVT needs to be used 'hard' and if you haven't an issue now then I'd recommend a dose of Redex every 2nd tank fill

Not sure where you are but I use Karl Fisher Autos in Cannock and recommend 'em 100% - check their website...

PS: had a local ASN member, now friend, and contributor here (Karl); attach his laptop to the A2 and the map showed an amazing boost up to and including a slight over-boost, however, at no time whilst making the 'boost' runs were we able to get the car to fail into 'limp-mode'; it was always the light-load and/or light/throttle applications that did it for me especially on the motorway with the A2 being such a light machine and needing a delicate foot (oh yes I have, sometimes...)
 
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Yeh thanks I'm in the north east .so quite a distance from yourself
Still unsure as to what I'm going to do at the moment. heard various solutions as to what it could be all I know is it's a pain in the ar// plus the cost
 
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