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Thread: Misfire #4 on 08 328i

  1. #1
    Join Date
    Nov 2017
    Location
    Marion, IL
    Posts
    1
    My Cars
    2007, 328i sedan

    Misfire #4 on 08 328i

    I have a p034 code. Last fall I changed all plugs and coils because I had the #3 misfire. It didnít help. I unplugged the (device) forget what itís called, in engine bay near driver side so son could drive through winter without the car dying. Now Iím getting the code when plugged back in. Car runs rough and stalls. The CAT light on the OBD is on in red too. I also cleaned the MAF sensor. Please help...

  2. #2
    Join Date
    Aug 2012
    Location
    Simi Valley, CA
    Posts
    331
    My Cars
    1990 BMW 525i
    I fixed that problem in mine by setting the plug gap to 0.044". No more misfire problems. Use Bosch plugs, not NGK.

  3. #3
    Join Date
    Jun 2017
    Location
    Denver, CO
    Posts
    264
    My Cars
    '08 E90 335xi manual
    1. Pull codes with a BMW-capable scanner, not that generic OBD2 toy.
    2. If the misfire is all you have, swap coils between the misfiring cylinder and a good one, and see if the misfire follows.

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