E32 750i misfire problems
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  1. #1
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    E32 750i misfire problems

    I tried posting in the 7 series section but it says I'm not allowed? Not sure why? Anyway hope this is okay maybe admin can move it for me?

    So... I had a intermittent misfire when I got it, no big deal... Then it got more often... And had a eggy smell... So I got a straight thru exhaust thinking it was collapsed cats, it wasn't the case..

    So tested the coil packs and the resistance is as it should and works as should.. Checked dizzy and they where well worn as well as rotor's so I replaced them and it ran a dream! Smooth as silk! Took it round the block and it was brilliant... For maybe a mile.... Then it came back

    So double checked the rotor's and dizzy and all as new and fitted properly.

    Does anyone have any ideas what it could be? It's driving me insane now... I think it's ht leads as I had to move them all and mess about and re fit them so I wonder if there's a couple of dodgy leads? Not sure where else to check?

    Hope someone can help

    Thanks
    Niall


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  2. #2
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    Any suggestions anyone?


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    If the leads are the last part of the ignition system then it is pointing to that?
    Have you checked the plugs?

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    Eggy smell is misfire. Pull the plugs and check colouration/ condition/ correct gaps. They are at the end of the HT circuit and can point you in the right direction if something has gone bendy back down the line. Get the fault codes read, there may have been an intermittent misfire from a coil and if that cylinder corresponds to a fouled looking plug, you're onto a winner.
    You can replicate the eggy smell by simply closing up a plug gap on one cylinder and running the engine but do it on a mates car in case you nuke the CAT.

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    Get a lead/ spark plug testers approx 10 from halfords which fit between the ht lead and plug, run the car and if you have a lead on the way it will show up.

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