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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Spark Plug DIY Disaster (Beware of the Schwaben Socket) and rough idle



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      01-03-2012, 01:58 PM   #67
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      01-04-2014, 11:32 PM   #68
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Sorry for reviving an old thread, anyone find a fix for this issue. Its been a thorn in my side for over 1.5 years. I just logged 30k miles on the last set of plugs and my new ones r doing the same thing. autohaaus Bosch oem plugs for both my current plugs an previous set. The original plugs never caused any shakes even at 45k miles.
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      01-04-2014, 11:41 PM   #69
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Sorry for reviving an old thread, anyone find a fix for this issue. Its been a thorn in my side for over 1.5 years. I just logged 30k miles on the last set of plugs and my new ones r doing the same thing. autohaaus Bosch oem plugs for both my current plugs an previous set. The original plugs never caused any shakes even at 45k miles.
I still have to try it but I read somewhere that gapping to 24 instead of 22 helps.
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      01-13-2014, 02:39 PM   #70
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I still have to try it but I read somewhere that gapping to 24 instead of 22 helps.
Okay... I never checked the gap's since I didn't have that tool. I just assumed that since it's an OEM bosch and the exact part for my car... that it should have come gaped correctly? I'll have to talk with my mechanic and see if we can go back in and check the gap for each one.
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      01-13-2014, 03:01 PM   #71
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Okay... I never checked the gap's since I didn't have that tool. I just assumed that since it's an OEM bosch and the exact part for my car... that it should have come gaped correctly? I'll have to talk with my mechanic and see if we can go back in and check the gap for each one.
What I read said the stock gap is 22 and that increasing to 24 helped with the rough idle. Like I said tough I have not tried this myself so cannot verify the fix.
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      12-30-2014, 05:54 PM   #72
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Sorry, I have to bring this back.

I have the raised idle issue with my car immediately after replacing the spark plugs and 1 coil on cylinder 5. The work was done by the BMW dealer. I have tried an adaptation reset and that didnt work. I replaced a vanos solenoid that failed and that seemed to have fixed the issue for about 600 miles. My DME fried and I got a new DME installed. The "raised idling" / misfire at idle issue came back and now the car constantly idles at 750rpm again.

I will be replacing my vacuum lines soon and getting a walnut blast but i highly doubt doing any of these things will solve the issue.

Has anyone had success fixing this issue with a regap or some insane reset?
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      03-22-2015, 08:18 PM   #73
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Bumping this because I have the same proble . No codes thrown at all
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