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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 11-15-2012, 08:06 PM   #1
omg A e46
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Motor is not running very smooth keep getting p0303

Ok so I changed my spark plugs about 2 months ago cuz it was misfiring and it's still misfiring. When I give it a lot of Throttle it starts to misfire then it gets a p0303 code then it won't stop misfiring until I shut off the engine and turn it back on. It happens about 8 times a day cuz I drive so much. And I know p0303 is Cylinder three misfire but how do I fix it. Could it be the coil pack on cylinder 3 ?
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Old 11-15-2012, 08:08 PM   #2
omg A e46
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It's a manual transmission too sorry forgot to add that
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Old 11-15-2012, 08:14 PM   #3
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Did you try swapping coils around?
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Old 11-15-2012, 08:21 PM   #4
omg A e46
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No I didn't try that yet. I will try it tomorrow
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Old 11-15-2012, 09:09 PM   #5
cvx5832
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If the code follows the coil, you have your answer.
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Old 11-15-2012, 09:19 PM   #6
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

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Old 11-16-2012, 11:16 PM   #7
omg A e46
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Ok so I switched the coil pack from cylinder 3 to cylinder 1. An it feels better from take offs. But it still kinda misfires when I give it a lot of throttle and not it won't throw a code. So I thing it's still that one coil pack.
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Old 11-16-2012, 11:34 PM   #8
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Try to get it to throw a code again. If it throws P0301 change the coil.
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Old 11-16-2012, 11:38 PM   #9
omg A e46
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I tryed to get it to throw a code but it wouldn't do it. And Before I switched it I could get it to throw a code no problem. So I think I will just buy a new coil and see what happens lol
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Old 11-17-2012, 01:11 PM   #10
omg A e46
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Ok I got it to throw a code this morning and it was p0301 so it's a bad coil pack happy that it is a easy fix
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Old 11-17-2012, 01:20 PM   #11
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Nice work.
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