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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-15-2013, 08:21 AM   #1
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Join Date: Oct 2012
Location: Nigeria
Posts: 20
My Ride: E46
Morning Misfires

Hi Guys,
I am facing problems of misfires with my e46 at every morning start or when the engine is too cold, when l switch off immediately and restart the engine again the misfire goes away until next morning. The SES light stays on.
Kindly suggest solutions as usual. Thanks
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Old 06-15-2013, 08:40 AM   #2
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Join Date: Oct 2012
Location: NYC
Posts: 501
My Ride: 03 M3, VF570 StgII
get new ignition coils, first find out which clinders are misfiring
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Old 06-15-2013, 12:13 PM   #3
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My Ride: E46
The misfiring cylinder is mainly no.3 and some times 3&5 together(the engine power stalls a little bit).
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Old 06-15-2013, 12:29 PM   #4
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,985
My Ride: 330CiC, M5, X5, E93
Its not likely an ignition coil problem.

What you are having is cold start with misfire and fuel cut off. Turning the engine off and back on will clear the misfire with fuel cut off, however, you still may have a slight misfire.

You likely have a vacuum leak or leaks.

I would start with inspecting the DISA and replace the DISA O-ring.

You can read all about vacuum leaks in this thread here, likely you can find you answer or at least rule out issues one by one - http://forum.e46fanatics.com/showthread.php?t=897616
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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