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Thread: Wont start

  1. #1
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    Default Wont start

    03 1.8 petrol

    For some time I've had these two error codes-

    Fuel trim malfunction
    MAP or MAF malfunction

    Fuel consumption into the teens..over fueling and failed emissions test. One night I got in and started as normal, it cut out within ten seconds and wont start, not even a hint of it.

    At first I thought fuel pump, however, if I disconnect the battery for over an hour and things reset, the car will start instantly and run for 20 minutes or so, then same thing again.

    MOT said the lambda was outwith its limits and advised to change but my scanner says lambda is ok when the engine is running????

    My guess is a sensor or something simple, trying to save a bit of money here by not replacing something that's not needed. It's already cost a few hundred when the RAC wrongly diagnosed the car

  2. #2
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    try getting a cheap map + maf from a scrappy.
    shame as i just sold 2 really cheap on ebay.
    They could definitely be the cause of your woes.

    try checking for air leaks around the inlet mani and the throttle body and this will cause a lean mix.

    also, it wont be your O2 sensor as that must be working to know that there is a lean/rich fault in the fuel.
    Last edited by johnsav; 8th October 2009 at 20:46.

  3. #3
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    Thanks John.

    Would a faulty MAP of MAF stop the engine running?

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