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Thread: could it be my air flow senser

  
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    could it be my air flow senser

    Hi Guys

    My car just failed its MOT on emmisions

    basically a good freind of mine is doing the test for me he said when he tests the cat emmisions @ 3000rpm the emmisions are fine

    as soon as he drops the revs back to idle the emissions go thru the roof

    he feels its the air flow sensor......


    could it be anything else?

    Cheers
    Dan

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    Lambda sensor maybe?

    What year and engine size astra is it on mate?
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    Hi Chap

    its a 2001 Y reg 1.8 16v sri

    so the engine is z18xe

    Dan

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    You done the Pedal test yet mate? to see if there is any fault codes stored?
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    In case you haven't I'm quoting Geodiebandit here but he words it better than i do

    Geordiebandit:-

    you can self diagnose faults on Z series engine contrary to public opinion.


    When you're ready I'll begin.....

    With keys out of ignition - press both brake & accelerator pedal at same time and keep them pressed to the floor....

    insert key and turn to 2nd click - ignition on but DONT START THE ENGINE

    Keep both pedals pressed throughout the procedure....

    the EML will flash just like previous models using the paperclip

    You will probably find the light flashes 10 times first then a pause then another number, a pause, another number, a pause then another number of flashes.

    I say 10 times for the first one as 10 flashes = a ZERO on the fault code and most engine related faults range from P0001 to P0999

    If for instance u have the following sequence

    10 flashes
    pause
    3 flashes
    pause
    10 flashes
    pause
    10 flashes

    this equals 10,3,10,10 which in turn equates to 0,3,0,0 or P0300 which in turn is "Multiple cylinder misfire"

    10 is the only number that becomes another number
    1-9 flashes remain a 1-9 code if that makes any sense
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