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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 > Misfire at Idle, None under power



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      07-28-2022, 11:13 AM   #1
Klos
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Exclamation Misfire at Idle, None under power

Hey so recently I've been trying to diagnose my misfire on my N54, I have swapped coils, spark plugs, injectors, changed injector seals, decouplers. My car is still misfiring at idle for some reason and I don't know what to change or what to swap anymore. If anyone has had a similar problem please let me know, and yes I've literally swapped a set of new index 12 injectors into the car and the same problem persisted. Its not the injectors.
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      07-28-2022, 02:03 PM   #2
335xiE90
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What's it throwing for codes? Did you code the injectors?
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      07-28-2022, 05:09 PM   #3
Klos
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Quote:
Originally Posted by 335xiE90 View Post
What's it throwing for codes? Did you code the injectors?
Yes I coded the injectors each time and drove 50km so the car learns the new values and there is no codes.
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      07-28-2022, 05:20 PM   #4
TSilver335i
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Quote:
Originally Posted by Klos View Post
Hey so recently I've been trying to diagnose my misfire on my N54, I have swapped coils, spark plugs, injectors, changed injector seals, decouplers. My car is still misfiring at idle for some reason and I don't know what to change or what to swap anymore. If anyone has had a similar problem please let me know, and yes I've literally swapped a set of new index 12 injectors into the car and the same problem persisted. Its not the injectors.
What plugs? Gap?
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      07-29-2022, 01:57 PM   #5
gardar
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Seems to be a common problem with the N54's and no single reason that causes it, if it's not throwing any errors then I guess you just have to go down the list, coils, injectors, plugs, fuel pressure regulator, vanos solenoids, etc.
Here's a long thread on the topic: https://www.e90post.com/forums/showthread.php?t=509274
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      07-29-2022, 02:54 PM   #6
CarAbuser
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Quote:
Originally Posted by gardar View Post
Seems to be a common problem with the N54's and no single reason that causes it, if it's not throwing any errors then I guess you just have to go down the list, coils, injectors, plugs, fuel pressure regulator, vanos solenoids, etc.
Here's a long thread on the topic: https://www.e90post.com/forums/showthread.php?t=509274
A slight shudder at idle is a really common problem, what OP is talking about is a misfire which is a different story.

A car that misses at idle and not during driving is often a fuelling issue. I would get a few logs of the rail pressure, fuel trims and lambda readings for both banks.
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