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    vauxhall vectra c 05 reg y22yh Archived Message

    Posted by jamie lambert on May 19, 2008, 7:35 pm

    Hi everybody
    Had the above vehicle in on friday, still have it now. Car came in with very lumpy idle and misfiring. Fault coded and came up with no faults.Car came from another garage they had put a coil pack and plugs on it and checked the compressions and were good. At first suspected an air leak so purchased a smoke pro today. Connected through the intake pipe after the air mass meter i presume i was doing everything right but no leaks left it on for a couple of cycles. Ive got some readings of the vehicle, these values are at idle.
    air mass sensor 14.83 kgh
    fuel pressure 5016.26 kpa
    b1s1 o2 sensor 1523 mv
    b1s1 air/fuel ratio lean for ages then
    somtimes rich
    b1s2 o2 sensor 879 mv
    b1s2 air/fuel ratio rich
    b1 short term fuel trim 4-13%
    co 2.02 lambda 1.171 hc 54 o2 4.42

    These values are at 2500 rpm

    air mass sensor 31.60 kgh
    fuel pressure 5030.85 kpa
    b1s1 o2 sensor 1465 mv
    b1s1 air/fuel ratio switching from lean
    to rich very slowly.
    b1s2 o2 sensor 742 mv
    b1s2 air/fuel ratio rich
    b1 short term fuel trim -2.67%
    co 0.44 lambda 0.989 hc 53 o2 0.03

    Im getting abit lost with this one, im thinking maybe the front oxygen sensor is at fault but not 100% certain i would much appreicate it if anyone can shed some light on this one.
    Regards Jamie

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