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    Corsa 1997 S12XZ single point injection Archived Message

    Posted by Paul Howd on September 26, 2008, 5:24 pm

    Real wierd one this.

    Originally poor performance. A clear case of blocked cat/exhaust.

    However having replaced all this the performance is still not "All there"

    Live data is fine for temp sensors, fuel presure is fine, fuel delivery is fine. not only did I try cleaning the injector a SH one has also been tried.

    But, it feels like a car with a duff MAF sensor-however it doenst have a MAF sensor it has a MAP!

    On scope the MAP seems to behave properly but...

    The voltages seem a little high!

    Autodata says Ing on OP should be 4.5, I am getting 5.0 (same at WOT engine running)

    Idle is around 2V as opposed to 1.0-1.5V

    Using a vac pump I have got the following readings.

    Vac Volts
    20 1.67
    19 1.91
    18 2.10
    17 2.30
    16 2.47
    15 2.72

    0 4.97

    Unfortunatly I have never actually taken detailed readings off a MAP before so dont know what to compare these with (unfortunatly, at the time, I didnt take readings for 0-15 vac for some reason)

    However I am going to try a new sensor and see what happens.

    If that dosnt work I will be officially baffled!

    Has anybody come across anything like this before. Any suggestions about where to go if the new sensor doesnt sort it.

    Paul

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