M42B18 Firing Sequence order.(FIXED)

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  1. M42B18 Firing Sequence order.(FIXED) 
    #1
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    Hey guys,

    I'm hoping someone here can answer my question. I have a 1993 BMW 318is with the M42B18 engine.

    I've been getting a lead in the head in the first spark plug cylinder so I decided on the weekend to install a new rocker cover gasket set.

    All over and done with but during the activity, I completely forgot to mark which HT lead ran to which coil

    Have put it all back together, and wasn't starting at first. Changed the leads around and it's now running but I think I still have the wrong firing sequence as it feels very rough compared to before I changed the seal.

    From reading around it seems that the engine is (front to back) 1-2-3-4, and the firing sequence is 1-3-4-2. But the problem is I unplugged the leads from both the coils and the plugs so i don't know which is which.

    Can anyone tell me which coils which, and where these need to go? Heres some pics of how I have it right now.

    Thanks for any light you guys can shed

    y5yta2pq.2pq.jpg
    yaneosfh.oyo.jpg
     
     

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    Normally the coil at the front is number 1 cylinder, then they go back in numerical order to number 4.

    As for the cylinders, they are correctly numbered in your top picture.

    I haven't come across that type of early coil set up though so may be wrong.
     
     

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    #3
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    Yeah I tried them in that order, had them follow the same order as the cylinder order. But it doesn't like to start.
     
     

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    Just wanted to post and say thanks for the help, but got it sorted

    So from front (radiator) to the rear (firewall) it goes

    Cylinder: 1-2-3-4
    Coilpack: 4-1-2-3

    Just thought i'd post the info in case anyone else has the same issue with these older E36 4 cylinder models
     
     

  7. The Following User Says Thank You to Jarsky For This Useful Post:

    Ronnie (24-02-2012)

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    Cheers for the update, much appreciated.
     
     

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