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Thread: HELP Misfire Cylinder 4

  1. #1
    Regular Member Coppen's Avatar
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    Default HELP Misfire Cylinder 4

    All on my '04 1.8 Vectra.

    The other day the EML came on...still drove fine. Read the codes and it threw up the lambda sensor.

    I still used the car while waiting for the sensor to arrive and the other day while doing a 5th to 4th change at 60mph lost power.

    Sounds like its running on 3 cylinders.....still accelerates but doesn't like it. Complete lack of power across entire range.

    Limped home and read the codes again and got lambda and misfire on cyl 4.

    I've tried 2 different lambda's, 2 coil packs and a AFM but to no avail the problem still persists.

    Not checked the plugs yet as don't have the correct socket atm but i'm thinking it surely can't just be down to those...can it????

    The RH 2 spark plug wells were full of oil (so not helping the coil pack no doubt) but that's due to a new rocker gasket being needed i'm pretty sure. Cleaned/dried them out and tried another coil pack and appears to start better but problem still occurs.

    What else do you guys suggest?

    Plugs? Compression test?

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    that is where your prob is , replace plugs , or even that one only ? that should be a first before coilpacks etc etc . if its sitting in a well of oil it will throw the spark onto the head .

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    Regular Member Coppen's Avatar
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    Thought as much seeing as i eliminated the others first. Just gotta find my plug socket today then

    Fingerz crossed its that

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    Regular Member rich r's Avatar
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    I'd have gone for spark plugs first - they're the cheapest part of the system, and also the part that's subject to wear. As a test, swap spark plug 4 and spark plug 1. Now see if it's throws up a 'misfire on cylinder 1' fault code...

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    Regular Member Coppen's Avatar
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    Quote Originally Posted by rich r View Post
    I'd have gone for spark plugs first - they're the cheapest part of the system, and also the part that's subject to wear. As a test, swap spark plug 4 and spark plug 1. Now see if it's throws up a 'misfire on cylinder 1' fault code...
    I'll try that when its light again. Yeah, i'd have normally done the same but had all the other parts to hand at the time as spares and had no spark plug socket. Least i know those spares are good

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    Regular Member Coppen's Avatar
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    Rightyo. Just removed all spark plugs. Everyone was covered in oil...thread to electrode!!! Fitted brand new set of plugs. Started fine. Run issue still remains...running on 3 cyl.

    Did another ECU check and had the following:

    P0036 HO2S Heater Control C ircuit (Bank 1 Sensor 2)
    P0100 Mass or Volume Air Flow Circuit Malfunction
    P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
    P0304 Cylinder 4 Misfire Detected
    P1565 Speed Control Command Switch Out of Range High

    O2 has been sorted but why has P0100 suddenly popped up????

    It never did before and when the issue first arrived. Have done 4 code reads now and this never showed until today ????

    I removed the AFM and replaced with a non-working and car failed to start...put original back on and started fine just the misfire still.

    What's next on the list???? Think i've covered everything that it might be unless engine is dead

    I'm at a loss

    ???????????

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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

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    coil pack

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    o and the p100 will be stored from when u put tue faulty maf on mate

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    Regular Member Coppen's Avatar
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    Quote Originally Posted by paulvectrac View Post
    coil pack
    Yeah i've tried 2 other coil packs but no change

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    Quote Originally Posted by paulvectrac View Post
    o and the p100 will be stored from when u put tue faulty maf on mate
    Of course, that would make sense...didn't even think.

    Do the coilpacks tend to fail on cyl 4 then??

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