Oil or fumes smell in cabin A6 c7 3l tdi

Luke Williamson

Luke Williamson

Luke A6AvantV6
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Hi all, I'm after a little help if possible.
I have recently noticed a smell of either oil or exhaust fumes in the cabin for short periods of time,having recently had the car serviced I checked the pollen filter to make sure it was seated correctly etc that was fine. Checked everything I could around engine for obvious signs of oil etc all seems to be fine,I did notice a smell of exhaust fumes in the engine bay,concerning me a little. I only seem to notice it when the car is cold on tick over,if anyone can shed any light on this it would be greatly appreciated cheers luke
 
I'm not too sure can check today, I just assumed the correct one was fitted! It is behind the glove box. I have tried to get it out to check.it but it is extremely tight inside the housing.coukd maybe of been damaged when fitted???
Many thanks
 
There's pollen filters and there's pollen filters .

2018 12 04 093323
 
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Thanks,I'm pretty sure that's what he fitted,the air filter fitted was also mann,I'll check to see if its seated correctly,its just bizarre how it was fine before the service a d now it isnt.
I did initially check for the pollen filter under the bonnet under plastic cover near side.it does seem as though there is a housing for a filter but none present ,I'm not sure if one is needed there? I've read that it could be a cracked or blocked cat or dpf? If it was that later I would expect there to be a light on dash unless it is in early stages?
Many thanks a d a y ideas very welcome
 
Regardless of filter fitted you should not be getting fumes in the car. Wherever you had the car service ask them to check things over. Also the filter is changed from inside the car so even if one was not fitted you should still not be getting fumes in the car.
 
Funny you mention this but I was also going to ask the same question. I thought there maybe a leak in the exhaust system somewhere but haven't had time to check it. I find it's worse on startup and getting into the car but then again after driving for a bit I maybe just used to it.

I've also got the 3.0tdi

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Yeah I'm pretty sure now that's what it is in mine,one of 2 flexi joints,one manifold down pipe or the other is part of egr system,I spoke to someone today who has seen this a few times.
Also some other chats forums have mentioned about cracked cats and dog's but he said that's only really when they are blocked and people don't unblock them correctly and keep using vehicle I'm going to look into it more at the wkend.
 
Let me know your findings. I'm going to have a look also when I get a chance.

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Interesting this.

There's been a handful of times I've thought I've noticed an oily/fumy smell in the car, but infrequently enough that I put it down to some other vehicle nearby.

Maybe it is mine after all ?
 
I strongly recommend you to check possible injector leak.
 
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Omergnl said:
I strongly recommend you to check possible injector leak.
Click to expand...
After you mentioned it I did a quick Google and it said it's pretty common! Thanks for that



This guy did it pretty good but being on lockdown for the next 3 months I might attempt it myself

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Thank you for posting this and the video.
When checking my car yesterday it 100% has the same as the vid with dripping onto exhaust. That will be one I can fix hopefully,but I also have another leak of some sort of leak on top of the engine also seeks to be carbonised which ive been told will be diesel. I'm not sure where that will be coming from but suspect a pipe above allowing it to drip down.
Many thanks for the help much appreciated
 
Again if its carbonised better to check injector leak or manifold leak as its on top of the engine, at least i would have started to look from there first.
 
Found someone on eBay who's selling the seals, oring's and bolts

https://www.ebay.co.uk/itm/184034543383

I think I could do the job myself but don't have the tools so probably get a mate to do it as he does. After all the lockdown clears hopefully can get it sorted!

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I just had the same issue.































































































































Symptoms: fumes in cabin and outside when cold and warm. So bad that fumes were getting into the house from the driveway through the extractor fans. It was horrid.. eye burning.. chest burning.. experience.



The cause: copper seal failure where the injector mates with the head. The fuel and exhaust gases escape from the seal and travel up the injector port to a small drain and comes out from the rocker cover bottom and drips onto the hot exhaust manifold. This then fills the engine bay with fumes and as you drive are sucked into cabin air inlet.



Went to audi and got complete 6 x complete seal kit with new stretch bolts £143. Changed the one side that smelt the worst and one of the three injectors was leaking and was black up to the rubber washer full of tar. Essentially I took out the air box and pipes. Cleaned the whole area as much as possible. Unclipped the harnesses and removed metal fuel pipes (17mm spanner) removed return fuels lines from injectors (pull plastic lock up and pull upwards) . Removed injector retention stretch bolts (need to be replaced) pulled the injectors put using a puller. Took off the majority of soiling and then put them in an ultrasonic cleaner for 2 hours. At the same time used a repeating kit to clean up and make a nice flat surfaces in then head for the new seals. Installed in reverse order. Stretch bolts 6nm + 90 degrees. Fuel line to a sensible tightness since I was using a spanner. Engine on the check for leaks. And then replace airbox pipes and in my case new air filter.

Total time 4 hours only because of the cleaning process.
 
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