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Thread: Misfire!

  1. 4th May 2014, 05:32 PM #1
    Road Stone Guest

    Misfire!

    Hi folks

    Today I had a momentary loss of power over a 2klm stretch in the V8.

    Got home and plugged in Hawkeye, to which it told me

    "Multiple misfires" and then individual cylinders 1,3,5,7 with various codes which I did not write down!

    Does this indicate a coil pack playing up?

    Cheers jerry
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  2. 4th May 2014, 06:02 PM #2
    bee utey's Avatar
    bee utey
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    The coil packs each fire two cylinders on each side, so you'd expect 1,4,6,7 or 8,3,5,2 to show misfires from one dying coil. I'd rather suspect an oxygen sensor playing up as they read one bank each. Dirty old sensors can leak heater voltage into the sensor element and give a false rich signal making the ECU lean off all cylinders affected. Once the ECU turns off the heater element the sensor would read near normal. The effect is clearly visible if you read the sensor output voltage with a suitable device. I've seen it plenty of times on LPG systems that have oxygen sensor input to the mixture controller.
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  3. 5th May 2014, 01:31 PM #3
    Road Stone Guest
    Many thanks for the reply.


    Yes I also had O2 sensor upstream faults showing, didn't take those numbers down either!


    I have some in my spares kit so will change them and report back.


    Cheers, Jerry
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  4. 6th May 2014, 06:20 PM #4
    Road Stone Guest
    Well all done and I thought I'd report back.

    And what an amazing difference, the transition is quite remarkable.

    All good no codes and performance wise, very noticeable improvement.

    Thanks Bee Utey for the pointer. I have put Britpart O2 sensors in so will be interesting to see how they go!

    Cheers Jerry
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