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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Possible coil??



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      03-06-2016, 01:11 PM   #1
Needbmwpartzz
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Possible coil??

Was driving then car started shaking with loss of power with check engine light came on ....pulled over to parking lot shut car off started car again then engine light went out.
However I noticed while waiting at stoplights the engine rpm would stumble for a second then resume at a constant...but no engine light now.
Does this sound like a coil slowly starting to fail or does anyone have an idea as to what this could be....I don't have a diagnostic reader to pull the code.
I have never done coil packs on this car yet and my odo is right at 130000km today.
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      03-06-2016, 01:40 PM   #2
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Could be one of many things (coils, plugs, injectors, Vanos etc). Only way to be sure is to get your fault codes read...
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      03-06-2016, 02:29 PM   #3
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Quote:
Originally Posted by Phil325i
Could be one of many things (coils, plugs, injectors, Vanos etc). Only way to be sure is to get your fault codes read...
Yeah not possible today...going to tear it down today and see if I can cause a coil to go bad by pulling it out to try and replicate the problem.
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      03-06-2016, 04:05 PM   #4
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Ok pulled the coils to see if I could isolate/replicate problem and seems I'm misfiring but not sure which one is going so going to replace all them but can't seem to find anyone on Sunday that carries them.
Should I go Bosch or Delphi or does it really matter....seems Bosch is cheaper:
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      03-07-2016, 05:48 AM   #5
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As coils have so many issues, I'd go OEM from BMW. That way you'll get the latest re-design (which I believe is Delphi).
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      03-07-2016, 02:15 PM   #6
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+ on it being a coil pack. Worn out spark plugs add to the failure of coilpack. Do it right and change all 6 plugs and coils. Swapping a coil only is a band aid.
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      03-07-2016, 07:27 PM   #7
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Quote:
Originally Posted by andrey_gta
+ on it being a coil pack. Worn out spark plugs add to the failure of coilpack. Do it right and change all 6 plugs and coils. Swapping a coil only is a band aid.
Done......update....replaced with Delphi coil packs and idle and drivability are even better than pre-problem.....however check engine light is still illuminated...wonder how long this will stay lit(heard it goes out after so many miles or starts)
Can any one confirm this or is the only way to clear the code to rid the engine light?
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      03-08-2016, 08:30 AM   #8
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Update....changed coils and engine light went away after 100km or so.
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      03-09-2016, 11:03 PM   #9
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It takes about 20 km for the light to go away in my experience.

Who was your source for the parts?
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      03-10-2016, 08:07 AM   #10
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Quote:
Originally Posted by andrey_gta
It takes about 20 km for the light to go away in my experience.

Who was your source for the parts?
Stealers.
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