Rough cold idle mis-fire

jfranci3 · 11-30-2017, 08:47 PM

2009 328i manual 75k
It started with miss at 2500-2900 rpm under load. Then I got a misfire code in #5. I knew I also had a leaking valve cover gasket.

Changed #5 coil, all plugs, and valve cover gasket. Now car misfires and rocks at low idle at 500-600 rpm. Runs ok at 900-1000 rpm idle and faster. I've swapped coils back and forth, and consistently get firing order 1 of 1 and 2 of 4 codes 0029CD 0029CE, which I think are cyl 1 and 6. I haven't tried swapping in the old plugs yet.

Any ideas???

JuniorB · 12-03-2017, 06:46 PM

What's your fuel pressure, so they smell, are they wet, oily?

jfranci3 · 12-03-2017, 10:18 PM

No, plugs are clean and dry.

I think I got a bad coil pack from AA Ignition off Amazon. Putting in a new Bosch Coil helped with some of the problem. I got to play with the fuel system today, which wasn’t so bad. I flipped the 1 & 3 and the 4 & 6 injectors. The remaining code moved, so mystery should be solved when the new injectors arrive (I’m replacing both, though only one is known bad).

ny325 · 12-14-2017, 12:51 PM

Funny how this usually happens when the temperature drops near freezing. My spark plugs are next.

11-30-2017, 08:47 PM	#1
jfranci3 Private 8 Rep 58 Posts Drives: Not yet Join Date: Jul 2012 Location: Chicago iTrader: (0)	Rough cold idle mis-fire 2009 328i manual 75k It started with miss at 2500-2900 rpm under load. Then I got a misfire code in #5. I knew I also had a leaking valve cover gasket. Changed #5 coil, all plugs, and valve cover gasket. Now car misfires and rocks at low idle at 500-600 rpm. Runs ok at 900-1000 rpm idle and faster. I've swapped coils back and forth, and consistently get firing order 1 of 1 and 2 of 4 codes 0029CD 0029CE, which I think are cyl 1 and 6. I haven't tried swapping in the old plugs yet. Any ideas???
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12-03-2017, 06:46 PM	#2
JuniorB Major 185 Rep 1,017 Posts Drives: 07 e60 525 N54 Join Date: Mar 2016 Location: Rhode Island iTrader: (0)	What's your fuel pressure, so they smell, are they wet, oily?
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12-03-2017, 10:18 PM	#3
jfranci3 Private 8 Rep 58 Posts Drives: Not yet Join Date: Jul 2012 Location: Chicago iTrader: (0)	No, plugs are clean and dry. I think I got a bad coil pack from AA Ignition off Amazon. Putting in a new Bosch Coil helped with some of the problem. I got to play with the fuel system today, which wasn’t so bad. I flipped the 1 & 3 and the 4 & 6 injectors. The remaining code moved, so mystery should be solved when the new injectors arrive (I’m replacing both, though only one is known bad). Last edited by jfranci3; 12-04-2017 at 11:09 AM..
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12-14-2017, 12:51 PM	#4
ny325 Brigadier General 895 Rep 3,141 Posts Drives: Jet Black E90 Join Date: Feb 2007 Location: Gridlock iTrader: (0)	Funny how this usually happens when the temperature drops near freezing. My spark plugs are next.
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