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Engine shake and a lot of smoke

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by b6.mo, Jan 7, 2014.

  1. b6.mo
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    b6.mo New Member

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    [Jan 7, 2014]
    Hi guys, I bought an Audi A4 b6 1.9 tdi a few months ago. When I bought the car it drove fine, only issue being that the car would shake on a cold start for about 20 seconds.

    The shaking gradually got worse and now shakes a ridiculous amount along with a lot of white smoke. No engine lights are showing however a fault does come up on the diagnostic thing and it shows '4th cylinder miss fire'. I purchased an injector from a local scrapyard, had it fitted and still the same problem.

    The mechanic has now told me it needs a new engine but I'm hoping the problem can be solved without having to purchase a new engine. Any ideas?
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  3. dualmono21
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    dualmono21 Well-Known Member

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    [Jan 7, 2014]
    get the car scanned and post up the codes
    a common problem on the 1.9tdi engine is for the wiring harness which connects the injectors goes faulty or reads a high impedance and stops the injectors working
    to be honest you should have changed the wiring harness before changing the injector
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  4. b6.mo
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    b6.mo New Member

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    [Jan 7, 2014]
    Ah sorry forgot to mention, mechanic tried changing the wiring harness. He happened to have a new harness in the garage.
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  5. dualmono21
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    dualmono21 Well-Known Member

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    [Jan 7, 2014]
    no problem

    ideally you still need the codes the car is giving you , this could give you a good insight into whats actually wrong
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  6. desertstorm
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    desertstorm Well-Known Member

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    [Jan 7, 2014]
    Have you checked the glowplugs ??? . If the fault occurs only on cold starts then it's not going to be an injector fault.
    Does it clear when the engine is warm.
    If so I would get a new mechanic or somebody who knows something about diesels as he is either a poor mechanic or is trying to rip you off.

    Karl.
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  7. b6.mo
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    b6.mo New Member

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    [Jan 7, 2014]
    The engine shake and the smoke is now constant, it continues even once the car has warmed up. I'll get the fault code and post it up tomorrow.
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  8. b6.mo
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    b6.mo New Member

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    [Jan 7, 2014]
    I haven't checked the glowplugs yet, can they cause the engine to shake excessively?
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  9. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Jan 7, 2014]
    No, they are only used at engine startup. Before chucking the engine get a second opinion from another garage. I got advised to chuck an engine when it was a simple head gasket fault.
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  10. Viking
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    Viking Member

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    [Jan 7, 2014]
    No, Glowplug fault would be poor starting and a bit of smoke for a few seconds. No misfiring really. Look elsewhere for your problems.

    What engine code is your car?
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  11. b6.mo
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    b6.mo New Member

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    [Jan 7, 2014]
    My engine code is avf. I'll be getting a second opinion tomorrow hopefully.
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