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Old 12-05-2012, 01:19 PM   #1
sihatch
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Rough idle, loss of power, rough throttle response. Help.

Hello,

My e46 m3 recently had the SES light come on right after my car started to loose power and have a rough idle. Its a consistent roughness and consistent loss of power. I have not gotten to check the SES as of yet to see what code it is. However I wanted to check and see what the potentials were. As of now I am thinking it could be the coils. I have no record history of the car having them changed. Spark plugs have less than 12k miles on them. All other maintenance is up to date. Do you all have any suggestions on what it could be? And yes I know I should have my SES light checked first. Which I will, just want to look into the different things it could be. Any help is very much appreciated!
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Old 12-05-2012, 01:20 PM   #2
sihatch
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Also I have not beat on the car and it was at normal operating temperatures and actually I drove it roughly 10 miles on the way to work before this began...
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Old 12-05-2012, 01:31 PM   #3
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Sounds like coils, but you will have to check the codes to be sure. A quick check is to unplug each coil one by one with the engine running. If it gets worse when you disconnect a coil that coil is good. If it doesn't change then that coil is bad. However, although it's USUALLY the coil, it could be the spark plugs or something else effecting the ignition of that cylinder.
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Old 12-05-2012, 01:35 PM   #4
sihatch
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Thanks. Yea im hoping the same also. Appreciate it! Seeing if there are any other things I cant think of. Im pretty mechanically inclined and work on cars often. Keep it coming you all! Worse comes worse ill get it checked and if the next scanner I use cant pull the code(s). Ill check the coils/plugs.
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Old 12-05-2012, 01:35 PM   #5
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Could be a vac leak. Check all the rubber piping going to the air box from the throttle body. Chances are there are tears.

edit: also i would replace the whole pcv system, just because.. its about time for an 03'

Last edited by EmFiftyFour; 12-05-2012 at 01:36 PM.
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Old 12-05-2012, 02:18 PM   #6
sihatch
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Thanks man. Ill check it out. Simple vac leake would be nice. Although for some reason I dont think thats what it is this go around : (
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Old 12-05-2012, 02:21 PM   #7
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Either a vac leak or coils. Check your codes


Your probably going to have a random misfire code P030X Depending on what Cyl is misfiring swap the coil to a different cylinder and see if the code follows.
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Old 12-05-2012, 03:00 PM   #8
EmFiftyFour
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Originally Posted by sihatch View Post
Thanks man. Ill check it out. Simple vac leake would be nice. Although for some reason I dont think thats what it is this go around : (
I had the same exact same symptoms when I had a vac leak. Eventually I blew my head gasket cause I drove like that for over 1k miles like that. Due to the mis-fire. Minimize your driving during this time.
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Old 12-05-2012, 10:20 PM   #9
sihatch
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Thanks, yea its in my garage now. I only drove it about 13 miles to get home and its been in the garage since. Dont plan on starting it until I get my codes pulled.
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Old 12-05-2012, 11:58 PM   #10
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Originally Posted by EmFiftyFour View Post
I had the same exact same symptoms when I had a vac leak. Eventually I blew my head gasket cause I drove like that for over 1k miles like that. Due to the mis-fire. Minimize your driving during this time.
Blew your head gasket? Driving on a misfire cause that?

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Old 12-06-2012, 01:38 PM   #11
sihatch
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Originally Posted by warriorpluto View Post
Blew your head gasket? Driving on a misfire cause that?

Sent from my SCH-I535 using Bimmer App
Can cause that yes, however its not likely unless you drive for a long time. Each car obviously acts differently to certain things but it can happen. Again very unlikely unless you drive it often or etc after the misfire(s) are showing. I have never personally heard of any that have done this out of all the cars I have fixed with mis fires wether it being a spark plug, bad coil, coil pack, etc....
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Old 12-07-2012, 03:24 AM   #12
EmFiftyFour
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Originally Posted by warriorpluto View Post
Blew your head gasket? Driving on a misfire cause that?

Sent from my SCH-I535 using Bimmer App
Sure can. Happened to me. I thought it only happens to people who overheat. Boy was I wrong. Driving down the highway, happily mis-firing like its all good, and BAM, huge cloud of white smoke filled the road behind me. Car lost most of its power and kept spitting out blackish blue smoke. Mechanic friends confirmed it. Took it home, fixed the head gasket, everything was fine. I must add though that there wasnt any coolant or oil mixing. Nor was the car overheating.

Last edited by EmFiftyFour; 12-07-2012 at 03:25 AM.
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Old 12-11-2012, 11:30 AM   #13
sihatch
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Just a update you all. I got my codes back. There were multiple and im sure its due to the coils being bad. I am having a no fire code on cylinder 4-6 which makes sense since it feels like it is running on 3 cylinders. Also from the previous owner stating he replaced three (1-3) it gave me the indication that regardless I need to change the other three. I bought 4 new bosch coils and should be here thursday! Cant wait to get it back on the road.
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Old 12-11-2012, 12:10 PM   #14
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I had a coil go out last week. It sucked. Check and see what brand the PO put in there. Make sure they're not some autozone special.

Coils are a weak spot in the M3. It's a pretty common failure, especially if you have the recalled bremi coils.
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Old 12-11-2012, 12:55 PM   #15
sihatch
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Originally Posted by choxor View Post
I had a coil go out last week. It sucked. Check and see what brand the PO put in there. Make sure they're not some autozone special.

Coils are a weak spot in the M3. It's a pretty common failure, especially if you have the recalled bremi coils.
Appreciate it. I believe they are Borg Warner however I need to pull it apart to check. This is just what my brother told me which is a good friend of the PO.
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