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Thread: engine warning light and slight misfire

  
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    popeye's Avatar
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    engine warning light and slight misfire

    was driving through town earlier and suddenly lost alot of power, had a slight misfire at idle but fine under load and the engine warning light came on. can i do a pedal test? i have a Z18XE engine in a y plate astra cab

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    yup pedal test will work

    could be AFM, coil pack, plugs etc etc

    anyway do the pedal test and see what comes up

    if it dont work then post in ur local regional forum on here and someone with opcom can come diagnose it for u

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    the fault code coming up is

    P0170 Rich Exhaust C-30
    P0170 Lean Exhaust C-30

    its the only one. any idea what could be wrong?

    edit: ive replaced the o2 sensor on the manifold with a bosch unit just over a month ago

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    update: i just replaced the AFM and the warning light is still on

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    this code can be set off by a small leak in the exhaust system, usually around the front end of the car and also a sluggish temp sensor that tricks the ecu for rich/lean settings

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