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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 > rough idle, random misfire codes, no loss of power or stalls or long cranks



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      01-23-2022, 01:10 AM   #1
EEG
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rough idle, random misfire codes, no loss of power or stalls or long cranks

rough idle as in bounces around in a range of maybe 200rpm when idling, not major shakiness

sometimes after a hard acceleration the car starts misfiring alot for the next 5-10 minutes

everything stock

spark plugs just replaced and vanos solenoids cleaned to no avail and oil change has been done regularly

since its random misfire, I kind of doubt it coils or injectors cause they wouldn't all go bad at once

and also I think alot of common issues would trigger specific codes maybe

let me know what you guys think thanks (09 335xi)
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      01-23-2022, 01:49 AM   #2
Saif2018
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Quote:
Originally Posted by EEG View Post
rough idle as in bounces around in a range of maybe 200rpm when idling, not major shakiness

sometimes after a hard acceleration the car starts misfiring alot for the next 5-10 minutes

everything stock

spark plugs just replaced and vanos solenoids cleaned to no avail and oil change has been done regularly

since its random misfire, I kind of doubt it coils or injectors cause they wouldn't all go bad at once

and also I think alot of common issues would trigger specific codes maybe

let me know what you guys think thanks (09 335xi)
Misfires are usually caused by plugs /coils or even injectors.

Read the codes to find out which cylinders misfiring, then swap coils to rule them out first.
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      01-23-2022, 05:49 AM   #3
richas
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Make sure the coil connectors are fully seated. Don't rely on the levers to pull them in.

Rich
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