Strange misfire issue

JK135i · 05-20-2014, 07:23 AM

My car has recently been developing a misfire problem on start up. It was on cylinder 4 and 5. I pulled the plug on 4 and it wasn't fouled nor was there any oil on it. I put that plug back in it's spot and swapped the coil packs to see if the misfire changed location, unfortunately I didn't have a chance to hook the computer up this morning but the misfire actually got worse, it sounded like I was driving a Subaru. The strange part is after the car comes out of "cold start mode" it runs just fine, no misfires at all even during WOT. Any idea what could be causing that?

I am running FBO + meth and the BB flash.

SDS135 · 05-20-2014, 09:13 AM

Have a similar issue. Multiple misfires on start up. CEL comes on, I pull over, turn the car off then on, CEL is gone, car is running fine. Happened on a couple cold starts recently but not every time. Running Stage 1 Sport.

05-20-2014, 07:23 AM	#1
JK135i 8:39 37 Rep 696 Posts Drives: 2010 135i Join Date: Mar 2010 Location: Jacksonville, Florida iTrader: (1) Garage List 2010 135i [9.50]	Strange misfire issue My car has recently been developing a misfire problem on start up. It was on cylinder 4 and 5. I pulled the plug on 4 and it wasn't fouled nor was there any oil on it. I put that plug back in it's spot and swapped the coil packs to see if the misfire changed location, unfortunately I didn't have a chance to hook the computer up this morning but the misfire actually got worse, it sounded like I was driving a Subaru. The strange part is after the car comes out of "cold start mode" it runs just fine, no misfires at all even during WOT. Any idea what could be causing that? I am running FBO + meth and the BB flash. __________________ "Never attribute to malice that which is adequately explained by stupidity."
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05-20-2014, 09:13 AM	#2
SDS135 First Lieutenant 19 Rep 318 Posts Drives: 2009 BMW 135i M Sport Join Date: Nov 2012 Location: Toronto, Ontario, Canada iTrader: (2)	Have a similar issue. Multiple misfires on start up. CEL comes on, I pull over, turn the car off then on, CEL is gone, car is running fine. Happened on a couple cold starts recently but not every time. Running Stage 1 Sport.
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