misfire and smoke on startup

mikelord7 · 06-23-2014, 01:28 PM

I started my car today and noticed a very rough idle, did not drive anywhere, then smoke coming from exhaust. The car was running fine last night, but now is idling rough and haven't driven it at all. Check engine light came on but nothing else.

What could this be? I've searched and it seems like the consensus is injectors. Would hpfp cause smoke? Anyway to know for sure before I throw money at it?

JB4 map 5 and DCI. New plugs 2k miles ago. Turned off JB4, but still won't run right.

Please help. I'm a novice compared to everyone on here.

Thanks

David1 · 06-23-2014, 01:33 PM

You probably have an injector stuck open. Your exhaust probably smells like gas.

mikelord7 · 06-23-2014, 02:13 PM

Thanks just replace them all?

No way it's hpfp and therefore covered by warrantee?

David1 · 06-23-2014, 03:16 PM

Need to test them first. Or start the car turn off while it is missing. Pull the plugs and see which ones are wet.

06-23-2014, 01:28 PM	#1
mikelord7 Private 8 Rep 99 Posts Drives: 2010 335XI 6MT Join Date: Jan 2014 Location: Exton, PA iTrader: (1)	misfire and smoke on startup I started my car today and noticed a very rough idle, did not drive anywhere, then smoke coming from exhaust. The car was running fine last night, but now is idling rough and haven't driven it at all. Check engine light came on but nothing else. What could this be? I've searched and it seems like the consensus is injectors. Would hpfp cause smoke? Anyway to know for sure before I throw money at it? JB4 map 5 and DCI. New plugs 2k miles ago. Turned off JB4, but still won't run right. Please help. I'm a novice compared to everyone on here. Thanks __________________ 2010 e90 335xi 6MT - JB4, DCI, Lux AEs
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06-23-2014, 01:33 PM	#2
David1 Brigadier General 948 Rep 4,039 Posts Drives: 09 E92 09 X5 Join Date: Mar 2007 Location: Columbus, OH iTrader: (1)	You probably have an injector stuck open. Your exhaust probably smells like gas. __________________ 2021 M2 Comp Sunset Orange \|Black with orange Stitching Dakota Leather\|Executive Pkg\|DCT
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06-23-2014, 02:13 PM	#3
mikelord7 Private 8 Rep 99 Posts Drives: 2010 335XI 6MT Join Date: Jan 2014 Location: Exton, PA iTrader: (1)	Thanks just replace them all? No way it's hpfp and therefore covered by warrantee?
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06-23-2014, 03:16 PM	#4
David1 Brigadier General 948 Rep 4,039 Posts Drives: 09 E92 09 X5 Join Date: Mar 2007 Location: Columbus, OH iTrader: (1)	Need to test them first. Or start the car turn off while it is missing. Pull the plugs and see which ones are wet. __________________ 2021 M2 Comp Sunset Orange \|Black with orange Stitching Dakota Leather\|Executive Pkg\|DCT
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