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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-08-2013, 07:01 PM
BMWbaffoon BMWbaffoon is offline
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Location: Orlando, FL
 
Join Date: Dec 2008
Posts: 25
Mein Auto: E65
Question Misfiring engine

Help: 2008 328i Two weeks ago, engine suddenly misfired consistently with lack of power, and the CEL came on. Lucky it was the weekend. Cheapo OBD 2 showed PO301. I narrowed it down to the #1 coil pack (integrated with spark plug connector). $80 later and she purred like a kitten. Next day, CEL reset itself, and she ran like a champ until tonight. Now it's misfiring again, and the OBD codes constantly change (U2500, POE8C, POE68) and others that don't make sense, or aren't listed. I was expecting P0302 - P0306.

Anyone have any ideas? When I bought the new coil pack from the stealer, parts guy asked if I wanted one or six? I only bought one as I didn't think these were a routine replacement. I also didn't want to spend $400 needlessly, which is the stealership's M.O. This car still has under 40,000 miles, but is beyond the warranty in age (Nov. 07)

Advice is appreciated!
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Old 01-09-2013, 02:11 AM
Leekay07 Leekay07 is offline
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Location: Fishkill, NY
 
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Mein Auto: 08 335Xi, 2013 X1
I`d check the battery power levels then replaced the plugs and all the coil packs.
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Old 01-09-2013, 04:44 AM
BMWbaffoon BMWbaffoon is offline
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Location: Orlando, FL
 
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That's next. Thanks!
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Old 01-09-2013, 01:34 PM
BMWbaffoon BMWbaffoon is offline
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Location: Orlando, FL
 
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Mein Auto: E65
Wink

Resolved:

#3 coil pack was the culprit this time. Parts guy (they're advisors now) at Stealership and Leekay are correct: If one goes, replace them all as the rest are getting in line to take a dump. In this case, only 10 days apart. I'll now buy the remaining 4 from Bavarian online and have them ready when the time comes.

Per BMW tech I met, no worries if you need to drive a bit on 5; car automatically shuts fuel off to the misfit cylinder.
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