Question about 2006 Volkswagen Jetta

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2006 Jetta TDI Black SMOKE

I have a 2006 Jetta TDI. I now have 240,000 miles on the vehicle. When the car was newer I got between 47-52 MPG. Over the last year this has dropped to the low 40's. I thought this may be due to the miles on the vehicle.
The other day I left on a 700 mile trip. About 650 miles into it my car suddenly seemed to loose power and produce black smoke under acceleration. The turbo runs more than normal. Once you get the black smoke "blown out" the car will run ok again for a while. I seem to have more problems with the carbon build up driving around town. On the interstate it seems to run better when I can get going 75-85mph.
I replaced the air filter. I replace the fuel filter. No better.
I read some forums written with similar problems. Sounded like the MAF sensor. I unhooked it. Seemed like it was running a little better with it unhooked. So I put on a new MAF sensor. Still really no better.
As long as I periodlically shift into neutral and rev the engine up to 4000-5000 rpm the car is driveable. But it still isn't 100% "right."
The check engine light has never come on.
The emissions light is not on either.
Kind of sounds like a vacuum leak? Is there any quick checks here?

If anyone has an idea of something to try next, I would appreciate it.

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  • tlp_14 Jun 28, 2009

    I"m not aware of any other filters on the car. You suppose any of the additives on the market might help? I've never had any luck with them in cars in the past...

    Just seems to me like the car isn't getting enough air. Every experience this @ higher altitudes? I normally drive @ 1000 ft < in elevation. I'm currently in Colorado (6000 ft + elevation). Suppose that has anything to do with it? (I know, I'm grasping for anything I can think of at this point)

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"MAS" sensor, thank you...when you unhooked it you "faulted" the ECM, returning to "limp back" mode...Injectors go wide open...fouling the MAS, and possibly others and the problem occurs again...and again...It runs OK when you're on the interstate because you have max air pressure in the plenum-tract. I'm afraid you'll continue this unless you spend the money to have it diagnosed. I do NOT recommend the dealer, maybe a local mechanic with diesel/import exp?
Good Luck
P.S. I believe you have more than one filter...try running Premium Diesel if available in your area for a couple tanks.

Posted on Jun 27, 2009

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Your problem is because of your altitude....the air is much thinner over a mile up....if fact on hot summer days large jets, and some small Cessnas will have problems departing from the Denver airport because of the high altitude and the the fact air is even thinner when hot.....

Posted on Aug 25, 2009

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I do not know how the "limp back" mode would foul the Mass Air Flow Sensor. The MAF is well away from the "injectors go wide open", which is not true. P.S. find a good local dealer to help with this problem, or leave me a note, Thanks

Posted on Jul 04, 2009

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