MISFIRES!!!

TheKid · 11-14-2011, 12:08 PM

Last week I found out I had a micro crack in valve cover and it was spurting oil onto the spark plugs which was causing the misfires.... after installing a new valve cover and gasket , changing the ignition coils as well with the spark plugs and cleaning the oil with break cleaner I thought it was fixed... today during a cold start it was a very rough start and have really bad stuttering and shaking trying to reverse out of my drive.... begin to drive and misfire at 2800 rpm not even 25 percent throttle 2 mins into the drive... Help please

Mike@N54Tuning.com · 11-14-2011, 12:14 PM

Is it limited to one cylinder?

Mike

Jeff@TopGearSolutions · 11-14-2011, 12:22 PM

Could be injectors now... need more info.

TheKid · 11-14-2011, 12:27 PM

scanned the car... prior to getting the valve cover replaced.... misfires in cyl # 3,4,5 this was because of the oil...I also got a random throttle body angle code... cleared everything and scanned it again misfire only in cyl 5.... I run 80-20 meth and 94 sunoco gas... I also have a gut feeling my hpfp is on the fritz.... side note... when the car is warmed up runs very well although I'm undering boosting in map 3 peak only to 15.8psi.

Mike@N54Tuning.com · 11-14-2011, 12:42 PM

Jeff is right, could be injector on #5. You can try swapping injectors with another cylinder to see if the problem moves.

Mike

jdbretz · 11-14-2011, 01:41 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Jeff is right, could be injector on #5. You can try swapping injectors with another cylinder to see if the problem moves.

Mike

Injectors need to be coded, so if you do swap them, don't forget about the coding.

enrita · 11-14-2011, 02:40 PM

Quote:

Originally Posted by jdbretz

Injectors need to be coded, so if you do swap them, don't forget about the coding.

and you need a new injector gasket - oring or whatever is called as well otherwise you will leak pressure.

vasillalov · 11-14-2011, 02:55 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Jeff is right, could be injector on #5. You can try swapping injectors with another cylinder to see if the problem moves.

Mike

Lovely advice! You should be ashamed!

11-14-2011, 12:08 PM	#1
TheKid Private First Class 23 Rep 122 Posts Drives: e92 335is Join Date: Nov 2010 Location: Toronto iTrader: (2)	MISFIRES!!! Last week I found out I had a micro crack in valve cover and it was spurting oil onto the spark plugs which was causing the misfires.... after installing a new valve cover and gasket , changing the ignition coils as well with the spark plugs and cleaning the oil with break cleaner I thought it was fixed... today during a cold start it was a very rough start and have really bad stuttering and shaking trying to reverse out of my drive.... begin to drive and misfire at 2800 rpm not even 25 percent throttle 2 mins into the drive... Help please __________________ COBB PROTUNE/HFS4/AFE STG 2 DCI/ BMS OCC/AR 3" C*tless DPs/ER CP/Forge DV's/ Eibach Pro springs/M3 suspension bits/CF rear diffuser/ 30% tints / Lightly smoked tails/ Blacked out grill /SSP clutches
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11-14-2011, 12:14 PM	#2
Mike@N54Tuning.com Joint Chiefs of Staff 4927 Rep 116,037 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Is it limited to one cylinder? Mike
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11-14-2011, 12:22 PM	#3
Jeff@TopGearSolutions 3442 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Could be injectors now... need more info.
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11-14-2011, 12:27 PM	#4
TheKid Private First Class 23 Rep 122 Posts Drives: e92 335is Join Date: Nov 2010 Location: Toronto iTrader: (2)	scanned the car... prior to getting the valve cover replaced.... misfires in cyl # 3,4,5 this was because of the oil...I also got a random throttle body angle code... cleared everything and scanned it again misfire only in cyl 5.... I run 80-20 meth and 94 sunoco gas... I also have a gut feeling my hpfp is on the fritz.... side note... when the car is warmed up runs very well although I'm undering boosting in map 3 peak only to 15.8psi. __________________ COBB PROTUNE/HFS4/AFE STG 2 DCI/ BMS OCC/AR 3" C*tless DPs/ER CP/Forge DV's/ Eibach Pro springs/M3 suspension bits/CF rear diffuser/ 30% tints / Lightly smoked tails/ Blacked out grill /SSP clutches
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11-14-2011, 12:42 PM	#5
Mike@N54Tuning.com Joint Chiefs of Staff 4927 Rep 116,037 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Jeff is right, could be injector on #5. You can try swapping injectors with another cylinder to see if the problem moves. Mike
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