VW Passat 2002 petrol misfire issues - Cant figure out the problem
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  1. #1
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    VW Passat 2002 petrol misfire issues - Cant figure out the problem

    Hi

    Thank you for welcoming me to the forum. Im looking forward to becoming part of the family.

    I have a 2002 VW Passat 2.0 litre 20v petrol (B5.5 europe)

    It is producing the following fault codes.

    17698 - Coolant Temp Sensor at Radiator Outlet (G83): Signal too Small
    P1290 - 002 - Lower Limit Exceeded - Intermittent
    17645 - Fuel Injector for Cylinder 1 (N30): Open Circuit
    P1237 - 004 - No Signal/Communication - Intermittent
    16684 - Random/Multiple Cylinder Misfire Detected
    P0300 - 001 - Upper Limit Exceeded - Intermittent
    16685 - Cylinder 1: Misfire Detected
    P0301 - 001 - Upper Limit Exceeded – Intermittent

    Car misfires intermittently and the engine emissions light flashes. According to the manual this means the Catalyst Converter is taking damage.

    There is no noise or smell just a judder and loss of power. Strangely never happens in the winter but does in the spring, summer months. I think having the Air con on full makes it happen more often, not sure if that means anything.

    Rev counter pulses at traffic lights etc (hunting I think its called)

    Diagnosis so far;

    Full service including spark plug and filter change.

    Coolant sensor replaced (apparently there are two though??)

    Injector 1 swapped with injector 2 (fault does not move from cylinder 1)

    Ignition coil 1 swapped with ignition coil 4 (fault does not move from cylinder 1)

    Car assessed by an auto electrician and all cables from injectors to ECU tested ok.

    Is there more than one coolant temperature sensor in this model? of so do you think this is causing the misfire and emissions light?

    Any help would be appreciated

    Take care

    Michael

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  3. #2
    PZ
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    I would expect you have a broken wire in the fuel injector harness, even if it tested ok. Either the cold plastic on the harness keeps in together or the extra vibrations of the a/c cause it to pull apart.

    The 2nd temps sensor is for the fan control and is in the lower radiator hose.

  4. #3
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    Hi PZ

    Thanks for the reply, much appreciated.

    I'm taking it to another garage at the weekend to get it priced up for an injector harness - I agree with you and cant think of anything it could be. As no one can replicate it when in for diagnosis it's time to start changing parts and testing further.

    Just to confirm, in your experience the coolant temp sensor wouldn't cause the misfire and emissions light?

    Is the harness usually an expensive job? Or is it relatively easy to change myself?

    Sorry about all the questions

    Michael

  5. #4
    PZ
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    The coolant sensor would not cause a misfire, but might cause a CEL.

    I would try swapping injectors before replacing the harness. It might have a bad connection or even a bad injector itself. I think the harness is all 1 pc under the hood, but we don't have that engine over here.

  6. #5
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    Thanks again PZ

    I swapped injector 1 and 2 around but the misfire stayed on cylinder 1.

    I'm just going to book it in to a garage and get them to swap the harness. I can't find any decent documentation to tackle it myself.

    I'll post on the forum when the jobs complete to let people know the outcome.

    Take care mate

    Michael

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