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    Re: vauxhall corsa 1.2 2003 Archived Message

    Posted by Glen Strachan on July 2, 2008, 8:50 am, in reply to "vauxhall corsa 1.4 2003"

    did this get fixed ?
    I have a 53 plate corsa 1.2 16v that is giving p0304 missfire cyl 4 and p0300 random missfire and p0170 fuel correction malfunction codes.
    Coil pack , plugs , MAF and O2 new.
    If you scope 02 it is switching OK, but only reaching 0.7v
    Scope MAF and you get a very poor pattern with a lot of hash on wot and then it takes a long time to return to 1.3v
    Manifold vac is good as is fuel pressure.
    I have checked valve timing, although unsure about cam sensor timing plate as I don't have the locking tool.
    Injection duration is moving about - at one stage I had it at 6.5ms at idle, but after a road test it returned to 3 ms.
    I have tried loosing the exhaust after the cat, but can't let it off before the cat as its all part of the manifold.
    This model doesn't have egr

    Driving it feels flat with a roughness at idle and I'm running out of ideas !!! Deffinatly seems to be weak ???

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