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Thread: Spark plugs

  1. #1
    Regular Member PeteRs's Avatar
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    Default Spark plugs

    got an SRi turbo here 3 plugs are sooty/black indicating running too rich 4th plug is normal colour it does run lumpy on tickover is there a fault somewhere causing 3 cylinders to overfuel thanks

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    Regular Member Gsi3.2's Avatar
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    there could well be a fault concerning the 3 'sooty' plugs.. there are 4 injectors after all..

    no management lights???

    Are the plugs dry and sooty or wet and oiled?..got a pic of plug condition?..

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    Regular Member PeteRs's Avatar
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    there dry & sooty no engine light on appears to run ok apart from lumpy tickover thanks

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    Regular Member Gsi3.2's Avatar
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    it could be failing coils packs ( failing to ignite the plug every spark)... does it pull well or does it hesitate up the rev range?..

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    Regular Member PeteRs's Avatar
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    got a pic yes its got a flat spot then takes off

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    Regular Member Gsi3.2's Avatar
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    and those plugs are like that, fresh out of your new engine?...

  7. #7
    Regular Member PeteRs's Avatar
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    no its my sons car hes just bought it i got an diesel cdti problay why it keeps breaking

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    Regular Member Gsi3.2's Avatar
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    Ahh.. didn't think you had a petrol.....

    things that make them run rich..

    1: induction kits... play havoc with the fuelling at low rpm's..
    2: lambda sensors.. but i would expect all 4 to be equally sooty
    3: weeping ( dribbleing injectors) allowing fuel past when they should be closed
    4: breaking down leads/DIS coils..

    has it had an emissions check to see what the idle mixture is like.. i.e. is it overfuelling or just not burning what it's got correctly...

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    he just bought it this morning but wanted me to service it & this is what i found when taking them out car is an 05 reg with 54000 think we'll get it checked out at garage as it dont seem right thanks

    i have pulled the HT leads off when engine running 1 & 3 engine runs still ok 2 & 4 engine cuts out dont know if this means owt
    Last edited by PeteRs; 2nd September 2008 at 16:58.

  10. #10
    Regular Member Gsi3.2's Avatar
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    what car is it?...vectra C?

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