Diesel smell in vehicle - Club Touareg Forums
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post #1 of 25 Old 12-15-2017 Thread Starter
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Diesel smell in vehicle

I have started noticing a diesel smell inside the cabin when the car is sitting still or idling. Never had this before but I am noticing that now. It has 113,000 miles on it and itís a 2009. What could cause this?


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post #2 of 25 Old 12-15-2017
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yup. i have been struggling with this for about 18 months. First it was a drivers side flex pipe... got that repaired and 10,000kms later it got really bad this week... the worst it has ever been. Took it in yesterday and found out today its leaking from the actuator on the turbo-a non serviceable part. bottom line turbo replacement $2,000 usd installed. hope your situation has less expensive solution. (2009 V6 TDI).
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post #3 of 25 Old 12-15-2017
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mine has 222,000kms about 137k miles.
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post #4 of 25 Old 12-15-2017
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Quote:
Originally Posted by sawtooth View Post
I have started noticing a diesel smell inside the cabin when the car is sitting still or idling. Never had this before but I am noticing that now.
Might be just your Webasto auxiliary heater kicking in because of the weather getting colder. Or door seals not sealing properly anymore, allowing fumes entering the cabin. Or the exhaust pipes - or more likely: the exhaust manifold - having cracked somewhere, and now leaking. Or DPF cracked, and there's now unfiltered exhaust passing by it. Or, or, or...

You can't really know until you at least visually inspect the car from the bottom while running. If there's nothing obvious, a pressurized smoke test might yield some clues.
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post #5 of 25 Old 12-16-2017
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I can't tell from your post if it is raw fuel or exhaust you are smelling.

If it is the smell of raw fuel, you probably have the fuel flange cracked problem. There is a active VW recall on many of the Touaregs for this problem.
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post #6 of 25 Old 12-16-2017
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it is exhaust- all my recalls are current.

also Gnits - sadly no Webasto heaters on North American V6 TDIs - only V10s.
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post #7 of 25 Old 12-16-2017
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Check cracks on exhaust manifold

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post #8 of 25 Old 12-17-2017
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FWIW: The diesel smell is more "classic" diesel before the DPF.

So strong diesel exhaust smell would have me looking at the exhaust system closer to the engine, before the DPF. The lighter "cleaner" smell would have me looking for leaks after the DPF.

Also Singh is correct. The exhaust manifold is a known problem child.
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post #9 of 25 Old 01-11-2018 Thread Starter
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Diesel smell in vehicle

Ok so more info. Iíve had this issue for 3 weeks now. Took it to dealer on Monday and they said they couldnít smell anything. Now this is not a VW dealer but a private dealership thatís trained in VW vehicles. Been going to them for four years now and they do awesome work. So was surprised when they didnít find anything. I picked up the car and drove 15 minutes home. I let the car idle for second and back came exhaust smell not fuel smell. However today I drove it and no smell at all. Temps are warmer today but seems to me something with a hole or cracked would still cause a issue. Does this help narrow things down a bit?

By the way normally when I stop with vehicle running I begin smelling exhaust within 30 seconds It happens quickly and by 1-2 minute its very strong causing me to roll down the windows.

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post #10 of 25 Old 01-12-2018
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I had this issue for years now, and because it never surfaced in warmer weather, and is loosely coupled to activating the A/C, it's definitely related to temperatures. I do not always smell exhaust, but if I do, it's either right after the car has been started after sitting for a longer period of time, or right after I turn the heating on.

Because of that I'm theorizing, that it might be because of a tiny crack or gasket leak somewhere along the exhaust or auxiliary heater exhaust systems, which hover seals itself, through thermal expansion, as soon as its surroundings reach operating temperature. And in the summer it's not actually there to begin with, because the ambient temperature is high enough to not allow for the crack/leak to actually open/appear.


One interesting this is, however, that since I've added Liqui Moly Super Diesel Additive to the tank a week ago, I didn't smell the exhaust a single time - not even under circumstances, when I otherwise did. I guess this is because this additive makes the fuel combustion more efficient/perfect, and thus reducing the fumes and/or the strength of the smell of the raw exhaust.
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