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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 03-19-2013, 12:30 AM   #1
jmanhas
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Help me diagnose my engine misfire :(

Hey guys, I've done hours and hours of research before making thisthread.

Codes I am getting0300 P03003 P03004 p03005 p03006

Symptoms: cold start idle hunting, feels like iit's about to stall sometimes, once warm it seems fine. somewhat bad fuel economy

Last edited by jmanhas; 04-16-2013 at 02:17 PM.
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Old 03-19-2013, 12:33 AM   #2
jasmit56
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O2 sensors only start doing there Job once the car heats up.. Could be your fuel pump or vanos seals.
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Old 03-19-2013, 01:10 AM   #3
jmanhas
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if it was my fuel pump, from what i read, there are two types of failures. Soft failure = car will die even with half tank of gas on the gauge. Or Hard failure = where my car will just die out of nowhere. Unless i am mistaken..
do vanos seals cause engine misfire??
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Old 03-19-2013, 03:44 AM   #4
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Vanos seals generally will lead to bad idle, car hesitating to stay alive at low rpm etc..
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Old 03-19-2013, 07:56 AM   #5
choxor
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Quote:
Originally Posted by jasmit56 View Post
Vanos seals generally will lead to bad idle, car hesitating to stay alive at low rpm etc..
This is an M3.

OP, translate those codes. We're not going to google each of them.
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Old 03-19-2013, 12:07 PM   #6
jmanhas
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The P0300 is multiple cylinder misfire, and p0300 etc is misfireon each cylinder number. I p0171 and p1074 is running llean
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Old 03-19-2013, 05:18 PM   #7
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Quote:
Originally Posted by choxor View Post
This is an M3.

OP, translate those codes. We're not going to google each of them.
Oh shii.. Sorry totally missed the fact it's an m3...
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Old 03-19-2013, 05:22 PM   #8
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Lean mixture codes is an air leak. Somewhere in the intake most likely. As far as your misfire, did it start after you changed your coils and plugs ? Did you use oem coils? What's plugs did you use?

Edit after reading again, it *possibly* could be the fuel pump causing the lean codes. If all the coils and plugs check out, I might consider that.
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Old 04-03-2013, 09:21 PM   #9
jmanhas
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Ok, so afte everything, I'm still getting misfires. I've made sure all coils and spark plugs were correctly fitted. Also installed the rebuilt vanos solenoid from Besian systems. Cleared codes and my car still misfires. I'm not sure what else it is...
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Old 04-04-2013, 06:08 AM   #10
evilpinkeye
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Fuel delivery acting up on you maybe?...still maybe fuel pump. How did you check for air leaks? Sprayed carb cleaner around to see if idle changes on you?
Man hope you find out what's wrong...
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Old 04-04-2013, 02:31 PM   #11
jmanhas
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So I took apart the engine cover and made sure all connections were good. I took out spark plugs and re installed them as well as the coils. It seems to have fixed the issue for now. I'll report back after another few days!
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Old 04-04-2013, 02:57 PM   #12
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Did you read the BMW codes? My Peake reader will tell you more than just the ODB codes.
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Old 04-04-2013, 02:58 PM   #13
jmanhas
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Noo I didn't get the BMW codes read. Are you back in town??
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Old 04-04-2013, 04:58 PM   #14
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Noo I didn't get the BMW codes read. Are you back in town??
Back with a tan and bottles of tequila! Stop by the office after 2 tomorrow and I can read the codes, txt me first.
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