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E46 General discussion and technical help for 1999-2004 3 series cars.

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Old 07-20-2009, 10:45 AM   #1
onelifeak

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Engine trouble

Hi everyone, I am having trouble with my 3 series and I was wondering if anyone could help me figure out the problem. When I drive the car I randomly lose power in cylinder 2 but if I turn the car on and off while driving it goes back to normal. Sometimes it doesn't come back that day and sometimes it occurs soon after reseting. I have replaced the injector, plugs, done a compression test, and I still do not know why this is happening. I was thinking that maybe something in the engine wiring is being pinched and randomly shorting out but do not know for sure. Any ideas?
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Old 07-20-2009, 11:13 AM   #2
3050rpm
 
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I've got to ask a basic, clarifying question... how do you know you're losing power specifically in the #2 cylinder?
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Old 07-20-2009, 12:03 PM   #3
onelifeak

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engine trouble

My father is a mechanic and he was helping me diagnose the problem and he was saying that the misfire is in cylinder two. I am always up for suggestions as to how I can test to make sure where the problem is. I am not personally positive it is on #2 but my father did a few tests and narrowed it down by switching a few parts in and out to see if the parts were bad or the specific cylinder was the problem.

Last edited by onelifeak; 07-20-2009 at 12:04 PM..
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Old 07-20-2009, 12:44 PM   #4
3050rpm
 
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Okay, so there's some assurance that it's from that cylinder... Hmmm, gotta think now...
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Old 07-20-2009, 04:51 PM   #5
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What about the coil, has your father swapped it out on the #2, or checked the resistance?
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Old 07-21-2009, 07:40 AM   #6
onelifeak

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Yes the coils have been changed.
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Old 07-21-2009, 10:11 AM   #7
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Then it's most likely wiring to the coil pack or the driver in the ECU is shorting out. Could be a loose/bad connector, but you description seems to lead towards an electrical fault. Any codes pop up?
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Old 07-21-2009, 11:15 AM   #8
onelifeak

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Thank you for the help I am going to check out the wiring and ECU and see how that works out. I will post my results once I figure it out.
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