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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, May-09-2012, 12:32:58 PM   #11
2003carbonM3
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Default Re: Misfires:what could it be besides coils/plug? Codes p1342, p1344, p1346, p0316, p

It clearly sounded like coil pack number one was bad....You stated you unplugged it and nothing happend, this would tell you that it wasn't firing correctly, also sounded like maybe another one was on its way out. Same way I used to test my audi. I would keep the rest of those coilpacks as back ups or sell them cheap, I'd keep atleast two of them for backups. Glad you fixed your baby!
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Old Wed, May-09-2012, 05:59:12 PM   #12
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Default Re: Misfires:what could it be besides coils/plug? Codes p1342, p1344, p1346, p0316, p

Quote:
Originally Posted by 2003carbonM3 View Post
It clearly sounded like coil pack number one was bad....You stated you unplugged it and nothing happend, this would tell you that it wasn't firing correctly, also sounded like maybe another one was on its way out. Same way I used to test my audi. I would keep the rest of those coilpacks as back ups or sell them cheap, I'd keep atleast two of them for backups. Glad you fixed your baby!
The problem did not follow the coil so i believe the coils are fine.

I did not fix my baby

Anyone have other ideas? or know of any reputable indy shops in West Los Angeles that would have either a GT1 or Autologic scanner?
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Old Thu, May-10-2012, 07:37:58 AM   #13
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Default Re: Misfires:what could it be besides coils/plug? Codes p1342, p1344, p1346, p0316, p

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Originally Posted by 2003carbonM3 View Post
It clearly sounded like coil pack number one was bad....You stated you unplugged it and nothing happend, this would tell you that it wasn't firing correctly
I think what was stated here is correct. Like I said. If Coil 1 is on Cylinder 1. with all coils pluged in and car running.. if you un-plug Coil #1, from Cylinder 1.. and no change in rpm or engine bogging happens, this would mean that, that Coil #1 on Cylinder 1 is dead. Do you have a scanner that can data log miss fire counts?

If you have a friend with a E46 M3 near by, maybe talk to him and see about putting a coil from his engine onto your cylinder 1..... then when its installed do the same test as i said.. start the car, while its at idle, dissconnect that new coil pack on cylinder 1 and the engine should bog down, rpms flucuate, that sort of thing...Also if your swaping coils from #1 to #4... when #4 is on cylinder 1... unplug that coil and see if the engine bogs down or rpms are fluctuating ect... then plug it back in and un-plug the coil on cylinder 4 that you swaped over. if no change in engine then its a coil.. but to test for sure if you have 1 or more coils not working, or on there way out, they need to be current ramped as I explained.

I think you are getting confused on following the coil. I understand what your doing. But from your description and symptons I believe its a coil, or possibly more. If you take it to an indy shop, request them to current ramp each individual coil and if possible if they can get you a print out of the current ramping if possible...some lab scopes or scanners may not have the printing feature.

Keep us posted.
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Last edited by Taunto; Thu, May-10-2012 at 07:41:41 AM.
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Old Thu, Dec-12-2013, 05:21:27 AM   #14
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Default Re: Misfires:what could it be besides coils/plug? Codes p1342, p1344, p1346, p0316, p

Was op able to fix the misfire?



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Discussing Misfires:what could it be besides coils/plug? Codes p1342, p1344, p1346, p0316, p1352 in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)