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Thread: Black smoke

  1. #1
    E500E Guru 500ESpain's Avatar
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    Black smoke

    The other day, flooring the car in a tunnel I noticed I left a cloud of smoke behind me. Next day, my dad was driving behind me and he said he could see some black smoke coming from the exhaust while doing city driving and nothing when we reached the highway.

    Cats (Magnaflow) and oxygen sensor have less than 3000 kms.

    Unfortunately I barely drive the car and when I do, it's almost all city driving, definitively not its habitat. Do you think some more highway driving and a good injector cleaner should fix the problem or is there something else I should check? I haven't looked for codes yet, I didn't have time.

    Thanks in advance.
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

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    Re: Black smoke

    Black smoke is raw fuel being dumped and not being burnt completely. Blue smoke is oil. White smoke is water and/or ATF being burned in combustion chamber. Could be faulty injector dumping fuel.

  3. #3
    E500E Guru 500ESpain's Avatar
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    Re: Black smoke

    Ok, thanks. I guess there's no way to check the injectors without removing them, right?
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

  4. #4
    .036 Hoonigan™
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    Re: Black smoke

    Quote Originally Posted by 500ESpain View Post
    Ok, thanks. I guess there's no way to check the injectors without removing them, right?
    There's no way to test without removing them and having the flow checked on a test bench.

    Is the engine running smoothly otherwise? Just some black smoke? Do you have a spare LH module you could pop in for testing?


  5. #5
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    Re: Black smoke

    I am more of an early K Jet guy which uses purely mechanical injectors (starts spraying once the crack over pressure has been reached). I would assume that the 500e has fully electronic injectors, so I am not sure how these would be bench tested, but I am sure the 500e guru's will chime in with a solution On the early K jet cars a common culprit is the cold start injector which fails, and then constantly dumps fuel across all operating conditions.

  6. #6
    E500E Guru 500ESpain's Avatar
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    Re: Black smoke

    Thanks gsxr and daantjie.

    I do have an extra LH module. I'll give it a try.

    Do the LH engines have the cold start injector?
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

  7. #7
    .036 Hoonigan™
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    Re: Black smoke

    Quote Originally Posted by 500ESpain View Post
    Do the LH engines have the cold start injector?
    No: LH-SFI is full electronic sequential injection, there is no additional cold-start injector (that was only used on older CIS/CIS-E mechanical injection systems).

    If you happen to have access to a digital scanner, I'd check the LH adaptation, and if you can view live values while driving I'd want to monitor the O2 sensor voltage.


  8. #8
    E500E Guru 500ESpain's Avatar
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    Re: Black smoke

    Ok, thanks. I'll try that too.
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

  9. #9
    E500E Guru 500ESpain's Avatar
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    Re: Black smoke

    Could it also be a faulty coolant temperature sensor? I don't have any related codes but I bought one because the car was overheating. Now it runs cooler with the new viscous fan but, in my opinion, it still has a tendency to run too hot, reaching 100C as soon as you leave the open road.

    If I'm not wrong, it's a very easy replacing operation, just unscrewing and screwing the new one. Am I right? Any torque specifications?
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

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    Re: Black smoke

    Yeah it could run rich due to a faulty coolant temp. sensor, but black smoke rich I m not so sure about. Also check hfm LH codes and o2 sensor. Wiring wariness is good?
    W123, W124, R129, W163, W201, R230

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  12. #11
    E500E Guru 500ESpain's Avatar
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    Re: Black smoke

    Yes, 02 sensor and harness are new. It's not a constant black situation. So far it has happened under hard acceleration and sometimes while driving in the city with cold engine.
    Esteban

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville

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    Re: Black smoke

    Quote Originally Posted by gsxr View Post
    There's no way to test without removing them and having the flow checked on a test bench.

    Is the engine running smoothly otherwise? Just some black smoke? Do you have a spare LH module you could pop in for testing?

    Of course there is a way of testing without removing the injectors.
    How you do that is put a fuel pressure gauge to the system...and checking for fuel pressure drop when doing a injector pulse test.
    1992 w124 500e "Blackbeauty"
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