'08 335i (n54) check engine w/rough idle on start up

rnokes72 · 05-11-2015, 06:52 PM

Look for some suggestions as to where to start. 83k mi check engine light is on and on start up the idle is a little rough. Once I rev a few times it seems to smooth out and there doesn't seem to be a loss of power. I am currently running FI cleaner through and am going to do one more treatment and see if I can get the code cleared.........like I said any suggestions would be appreciated.

trohde78 · 05-11-2015, 07:25 PM

What's the code?

335NJ · 05-11-2015, 07:46 PM

If you're getting a misfire code on startup, it's likely a leaky injector.

mike@x-ph.com · 05-11-2015, 07:51 PM

Get the codes if you are getting any. As stated above if this is happening on cold start only, it is probably a bad injector.

vapore0n · 05-12-2015, 07:51 AM

+1 to leaky injector.
Mine showed up as Missfire cylinder 6. Code didnt go away after replacing sparks/coils. Replacing injector did fix it.

techwhiz · 05-12-2015, 12:28 PM

Quote:

Originally Posted by 335NJ

If you're getting a misfire code on startup, it's likely a leaky injector.

This +1. Been there done that.

05-11-2015, 06:52 PM	#1
rnokes72 Registered 0 Rep 1 Posts Drives: 08 335i E90 Join Date: May 2013 Location: United States iTrader: (0)	'08 335i (n54) check engine w/rough idle on start up Look for some suggestions as to where to start. 83k mi check engine light is on and on start up the idle is a little rough. Once I rev a few times it seems to smooth out and there doesn't seem to be a loss of power. I am currently running FI cleaner through and am going to do one more treatment and see if I can get the code cleared.........like I said any suggestions would be appreciated.
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05-11-2015, 07:25 PM	#2
trohde78 Captain 74 Rep 718 Posts Drives: 2007 e92 335i 6MT Join Date: Apr 2013 Location: Chicago Suburbs iTrader: (6)	What's the code?
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05-11-2015, 07:46 PM	#3
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	If you're getting a misfire code on startup, it's likely a leaky injector.
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05-11-2015, 07:51 PM	#4
mike@x-ph.com BimmerPost Supporting Vendor 24199 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Get the codes if you are getting any. As stated above if this is happening on cold start only, it is probably a bad injector. __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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05-12-2015, 07:51 AM	#5
vapore0n Captain 40 Rep 669 Posts Drives: 2010 335i Join Date: Jul 2011 Location: MA iTrader: (0)	+1 to leaky injector. Mine showed up as Missfire cylinder 6. Code didnt go away after replacing sparks/coils. Replacing injector did fix it.
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