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Thread: Replaced plugs & 5 coil packs... car won't start

  1. #1
    Join Date
    Jul 2009
    Location
    spartanburg, sc
    Posts
    28
    My Cars
    2008 535Xi

    Replaced plugs & 5 coil packs... car won't start

    The car will turn over and it almost fires. Almost like it's out of fuel. But that's not the case. I replaced 5 coil packs because the 6th was replaced by the dealer in the Fall. The plugs were the same that came out: Bosch ZGR6STE2. The coil packs are Bosch 0221 504 470; replaced all 6. One old coil had a crack in the boot near the plug. That's probably what was causing my misfiring at low rev/high torque. Anyway, I can't imagine what the problem is. I took care to install everything properly... used dielectric grease (sparingly), antisieze on plugs.

    I'm going back and checking my work now. If anyone has ideas, I'd greatly appreciate it.

  2. #2
    Join Date
    Jul 2009
    Location
    spartanburg, sc
    Posts
    28
    My Cars
    2008 535Xi
    Hmmm... found something about mixing brands of coil packs. The single coil that was replaced in the Fall is likely OEM. It's definitely not Bosch.

  3. #3
    Join Date
    Jul 2009
    Location
    spartanburg, sc
    Posts
    28
    My Cars
    2008 535Xi
    I see that I have a contradictory statement about the number of coil packs replaced. I replaced only 5. And I found the problem; the plugs woulldn't completely slide into the receptacles on the coil, like on the coil replaced by the dealer. After some finagling and some dielectric grease, they seated. So now the car is running fairly well although the idle is somewhat rougher than before.

  4. #4
    Join Date
    Aug 2016
    Location
    Next to Snowden
    Posts
    82
    My Cars
    Not a BMW that's for sur
    Many of have issues with the Bosch ZGR6STE2 plugs and go with the NGK's instead. Most common problem is a soft miss at idle.

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