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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 Thu, Apr-04-2019, 01:36:50 PM   #11
sacman
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

I don't own an E46 M3 and i'm looking for one but I did have my fair share of random misfires with my 993. Yes, it is a PITA especially during the inspection time. I chased with with all possible options and suggestions and it was really annoying and frustrating when the car drives like there's nothing wrong at all. In my case, it turned out to be the flywheel. There is a sensor that relies on the flywheel to report the timing to the DME and in my case causing the CEL due to emission faults. If your flywheel is old enough, mine was 80Kmiles, it's probably good to take a look.
QN
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Old Thu, Apr-04-2019, 01:39:29 PM   #12
alwaysbored786
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by ThunderMoose View Post
Our cars donít seem to have complicated vacuum systems near as I can figure. You buy a smoker and do a smoke test. I have one and it never yielded anything.

Youíre certain on O2 sensors because the same guys that installed headers checked it three times?

I have had issues with misfires caused by vanos. Once it was solenoid pack but that threw codes. Another time it was the solenoid valve body needing to get cleaned.

Coil packs going bad can cause it. When I have one go, I just replace all 6.


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I always love a good excuse to buy some tools, bought a fuel pressure test gauge set cause of this, always a bright side haha!

I actually installed the headers with a buddy, and we threw in the old bosch o2 sensors willy nilly without double checking banks in regards to being euro headers. The shop that changed out my o2 sensors to OEM BMW ones confirmed they are in the correct banks for Euro headers.

I almost forgot about cleaning the solenoid, i'll have to give that a shot for sure, thanks for the reminder.

Im hoping I can drill down and replace the offending part. I've put about $800 in trying to find this misfire already (replacing parts + some labor). Next ill do spark plugs since i have FCP warranty on those.
__________________
Current Stable:
2006 ZCP M3, Interlagos Blue/Black, 6MT
1998 M3 Coupe, Black/Black, 5MT, 28K miles
1996 M3 Coupe, Techno Violet/Hurricane, 5MT

Gone but not fogotten:
1997 M3 Coupe Techno Violet/Mulberry 5MT, 2004 Noble M12 GTO 3R 6MT, 1996 XJ Red/Tan AT, 1995 M3 Coupe Silver 5MT, 1988 325e Black/Black 5MT, 2002 330ci Blue/Grey 5MT, 2003 ZHP Sedan Black/Black 6MT, 2003 M3 Imola Red/Black 6MT
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Old Thu, Apr-04-2019, 01:39:40 PM   #13
ThunderMoose
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by sacman View Post
I don't own an E46 M3 and i'm looking for one but I did have my fair share of random misfires with my 993. Yes, it is a PITA especially during the inspection time. I chased with with all possible options and suggestions and it was really annoying and frustrating when the car drives like there's nothing wrong at all. In my case, it turned out to be the flywheel. There is a sensor that relies on the flywheel to report the timing to the DME and in my case causing the CEL due to emission faults. If your flywheel is old enough, mine was 80Kmiles, it's probably good to take a look.
QN


E46 M3 doesnít use flywheel for timing but we do a wheel on the crank itself. That would be something to check though.


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__________________


#67 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS Suspension, Hyperco 800F 900R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Thu, Apr-04-2019, 01:44:20 PM   #14
ThunderMoose
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by alwaysbored786 View Post
I always love a good excuse to buy some tools, bought a fuel pressure test gauge set cause of this, always a bright side haha!



I actually installed the headers with a buddy, and we threw in the old bosch o2 sensors willy nilly without double checking banks in regards to being euro headers. The shop that changed out my o2 sensors to OEM BMW ones confirmed they are in the correct banks for Euro headers.



I almost forgot about cleaning the solenoid, i'll have to give that a shot for sure, thanks for the reminder.



Im hoping I can drill down and replace the offending part. I've put about $800 in trying to find this misfire already (replacing parts + some labor). Next ill do spark plugs since i have FCP warranty on those.

FWIW there about 100+ threads on here with someone describing the symptoms you have after a header swap and that they are 100% sure that they are installed correctly and report back later that they indeed were crossed. If it was me, the car would have been up in the air and the sensors swapped after the first misfire.


Sent from my iPhone using Tapatalk
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#67 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS Suspension, Hyperco 800F 900R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Thu, Apr-04-2019, 01:59:41 PM   #15
Drewster
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by ThunderMoose View Post
FWIW there about 100+ threads on here with someone describing the symptoms you have after a header swap and that they are 100% sure that they are installed correctly and report back later that they indeed were crossed. If it was me, the car would have been up in the air and the sensors swapped after the first misfire.


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Yup - "I triple checked, so it must be something else" is pretty frequent
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Old Thu, Apr-04-2019, 02:00:25 PM   #16
alwaysbored786
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by ThunderMoose View Post
FWIW there about 100+ threads on here with someone describing the symptoms you have after a header swap and that they are 100% sure that they are installed correctly and report back later that they indeed were crossed. If it was me, the car would have been up in the air and the sensors swapped after the first misfire.


Sent from my iPhone using Tapatalk
I'll check them again, probably do a short term fuel trim test and O2 live data view during and after a drive to see how it responds, then swap O2's and see how it looks again.
__________________
Current Stable:
2006 ZCP M3, Interlagos Blue/Black, 6MT
1998 M3 Coupe, Black/Black, 5MT, 28K miles
1996 M3 Coupe, Techno Violet/Hurricane, 5MT

Gone but not fogotten:
1997 M3 Coupe Techno Violet/Mulberry 5MT, 2004 Noble M12 GTO 3R 6MT, 1996 XJ Red/Tan AT, 1995 M3 Coupe Silver 5MT, 1988 325e Black/Black 5MT, 2002 330ci Blue/Grey 5MT, 2003 ZHP Sedan Black/Black 6MT, 2003 M3 Imola Red/Black 6MT
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Old Thu, Apr-04-2019, 02:23:10 PM   #17
alwaysbored786
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by Drewster View Post
Yup - "I triple checked, so it must be something else" is pretty frequent
Just to confirm, so im clear headed when I do this. From searching around, it seems 11781743994 - 840mm (Pre cat Bank 1 sensor), should be plugged into the long pre cat bank 1 (cyl 1-3) euro header. And 11781405324 - 750mm (pre at bank 2 sensor), should be screwed into the shorter bank 2 euro header (cyl 4-6), correct?
__________________
Current Stable:
2006 ZCP M3, Interlagos Blue/Black, 6MT
1998 M3 Coupe, Black/Black, 5MT, 28K miles
1996 M3 Coupe, Techno Violet/Hurricane, 5MT

Gone but not fogotten:
1997 M3 Coupe Techno Violet/Mulberry 5MT, 2004 Noble M12 GTO 3R 6MT, 1996 XJ Red/Tan AT, 1995 M3 Coupe Silver 5MT, 1988 325e Black/Black 5MT, 2002 330ci Blue/Grey 5MT, 2003 ZHP Sedan Black/Black 6MT, 2003 M3 Imola Red/Black 6MT
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Old Thu, Apr-04-2019, 02:25:08 PM   #18
ThunderMoose
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by alwaysbored786 View Post
Just to confirm, so im clear headed when I do this. From searching around, it seems 11781743994 - 840mm (Pre cat Bank 1 sensor), should be plugged into the long pre cat bank 1 (cyl 1-3) euro header. And 11781405324 - 750mm (pre at bank 2 sensor), should be screwed into the shorter bank 2 euro header (cyl 4-6), correct?


Just swap at the bungs and see if it goes away.


Sent from my iPhone using Tapatalk
__________________


#67 2017 NASA TX TT3 Champion

FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS Suspension, Hyperco 800F 900R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Thu, Apr-04-2019, 02:27:41 PM   #19
alwaysbored786
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Quote:
Originally Posted by ThunderMoose View Post
Just swap at the bungs and see if it goes away.


Sent from my iPhone using Tapatalk

Will do, hope the wires have enough length!
__________________
Current Stable:
2006 ZCP M3, Interlagos Blue/Black, 6MT
1998 M3 Coupe, Black/Black, 5MT, 28K miles
1996 M3 Coupe, Techno Violet/Hurricane, 5MT

Gone but not fogotten:
1997 M3 Coupe Techno Violet/Mulberry 5MT, 2004 Noble M12 GTO 3R 6MT, 1996 XJ Red/Tan AT, 1995 M3 Coupe Silver 5MT, 1988 325e Black/Black 5MT, 2002 330ci Blue/Grey 5MT, 2003 ZHP Sedan Black/Black 6MT, 2003 M3 Imola Red/Black 6MT
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Old Thu, Apr-04-2019, 02:42:18 PM   #20
Steve M3
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Default Re: At my wits end, misfire issue, OBDII monitors incomplete...

Which tune do you have? If it's the OE CSL tune for the box, I've heard that it has problems showing emissions readiness on some state computers.

Or is it simply not showing ready because you keep clearing the misfire CEL and you don't have time to go through a drive cycle before it comes back?
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Discussing At my wits end, misfire issue, OBDII monitors incomplete... 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)