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Thread: Excessive Exhaust Smoke

  1. #1

    Default Excessive Exhaust Smoke

    My 2002 TDI Jetta smokes really bad when I accelerate hard for passing, etc. I don't think it did it as much when I first got it but now seems to do it more and don't seem to have the power it had at first too. It has decent power but seems pick up and go is not as strong as before. VW mechanic told me I needed to pay $200.00 to have head removed and carbon cleaned off. Was he telling truth or just wanting more of my money? Costs almost $100.00 an hour to have VW dealer work on it anyways. I would like to have less smoke and more power so is there a way to get this done? Thanks for any info.

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  3. #2
    not your typical air ride DasBohan is on a distinguished road DasBohan's Avatar
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    Nov 2008

    Default Re: Excessive Exhaust Smoke

    is the smoke blueish white?
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  4. #3

    Default Re: Excessive Exhaust Smoke

    Blackish looking. Like diesel truck.

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  6. #4

    Default Re: Excessive Exhaust Smoke

    That's normal for a diesel. Basically what you did was a thing called "rolling coal". Where you stomp on it and since the engine can't burn all of the diesel going into the engine it comes out as black smoke. It's perfectly normal. The best way to clean the carbon out is to take it on the highway and bring it up to 70 for around 20 to 30 minutes. Cleans it out the best by burning it at a higher temp. That or get carb out I think it's called. That or gum out. Just go to auto value store and tell them you want to clean the carbon out of your car but don't know how. They will help you.

  7. #5
    Junior Member MasterSpyKiller is on a distinguished road MasterSpyKiller's Avatar
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    Oct 2015
    Thousand Oaks, CA

    Default Re: Excessive Exhaust Smoke

    I am having a similar issue with my 2006 TDI 1.9L. HOWEVER, I am having some other problems too, which may mean entirely different things for me and you.

    I noticed a while ago, that the engine is now very slow to accelerate until about 1500 RPMs, then it pulls hard (with a puff of black smoke). Not a little puff, a big puff. Enough for me to see it in the rear view mirror in the headlights of the car behind me.

    That seems to be new. IIRC, it used to accelerate pretty hard from about 1k RPMs (very little "lag").

    A VW specialist mechanic DID tell me the "throttle plate" was blackened with carbon and soot and needed cleaning. I paid for half hour labor to have that done (he was doing other, unrelated work too). Unfortunately, there is another problem with the car that MIGHT or MIGHT NOT be causing or exacerbating the low power/black smoke issue. Until I get that repaired (working on it), can't tell you if cleaning the throttle plate did anything for me.

    Your post is quite old (5 months), so please post a FOLLOW UP and explain how it was repaired (or not) to benefit others. Thanks!

  8. #6

    Default Re: Excessive Exhaust Smoke

    The turbos on the TDIs are variable. The vanes may be sticking then
    open up when you hit a certain RPM, thus the sudden burst of boost requires
    fuel, and you get the black smoke. That black smoke is basically, unburned
    diesel that's pushed out on the exhaust stroke. Without a DPF, that's what
    you see.

    Cleaning a TB plate does very little unless it's caked enough to hinder
    air flow which means, you need at least a 8th inch of build-up on the plate.
    However, it can cause it to stick as well, then all of the sudden flip open
    to where it's supposed to be, thus the burst in speed, and black smoke.
    Usually, though, you'll get a MIL for this.

    Diesels do not meter air against fuel like a gasoline car does, it's just the
    opposite with a diesel. As long as there is fuel, the motor runs unless the
    air supply is completely choked off, and even then, it can run with just the
    slight amount of air. This is why a diesel engine can "run away."

    Anyhow, yours may be a turbo issue, the vanes sticking.

  9. #7

    Default Re: Excessive Exhaust Smoke

    Mine, however, is only from stomping on the pedal from a stand-still. My DPF
    is deteriorating (I don't care either), so I get smoke at WOT from a stand still,
    or at any time I go WOT to 60 when cruising. If I stomp on it at 65, I see nothing,
    unless on an upward climb, even with all this, it's not all the time.

    I used a Spulin torque-mount bushing insert, and apparently, the vibrations from
    the motor cracked the DPF, and the continual vibrations are shaking it apart.
    Love the HP, TQ. and MPG increase though... No DIESEL emissions in PA, so I
    am all good...

  10. #8

    Default Re: Excessive Exhaust Smoke

    I'm sure with it having 233,000 miles on it, it's not going to have the power it did at 52,000. Lol. Thanks

  11. #9

    Default Re: Excessive Exhaust Smoke

    Quote Originally Posted by spottedbucky View Post
    I'm sure with it having 233,000 miles on it, it's not going to have the power it did at 52,000. Lol. Thanks
    My 2013 has over 230,000 miles as well, no performance issues. It got better due to the
    cracked and deteriorating DPF. If kept up, a diesel will continue to perform well into the
    500,000 mile range. I also disconnected the EGR for a more complete fuel burn, and
    doing that I no longer get a puff of black smoke when I stomp on it.

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