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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 Sat, Jun-23-2018, 02:36:47 PM   #11
bigjae1976
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Default Misfire Issue - Cyl 6

Quote:
Originally Posted by mrgizmo04 View Post
Jae,
It's very specific to one cylinder...outside of the usual maintenance stuff like coil, injector, plug, maybe electrical connections, you also have some internals that could be causing it - worn cam lobe, burnt valve, bent valve(?), misadjusted valve, broken piston ring or broken ridge between piston rings, etc. When you did the head gasket you notice anything on the cam or valves?

When I posted my first infamous post on the forum last Aug, chasing misfire and stutter on mostly 1 cylinder without codes, I ran through everything, coils, plugs, injectors, etc. What ended up helping me the most was a valve adjustment when I got around to it. The cylinder that was misfiring the most needed a MUCH bigger shim.
I just put on a different head/cams and the cylinders looked fine when I had the head off. Just did a valve adjustment and all of the valve shims were between .218 to .226.

I donít think timing is an issue because Iíve I had the misfire before and after removing the head.

Come to think about it...the only thing on the head that is the same is the VANOS.

Quote:
Originally Posted by ThunderMoose View Post
I had some mystery misfires that I was able to resolve by cleaning the vanos solenoid valve body. My theory is that it was a tad too slow to adjust cam timing. Easy enough to do.
What error codes did you get?
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Last edited by bigjae1976; Sat, Jun-23-2018 at 02:40:38 PM.
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Old Sat, Jun-23-2018, 02:42:08 PM   #12
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by Ramp1 View Post
Double check all the wiring for the coil and injector for that cylinder. I had a similar issue on an old car i had that would come and go and Ďfiddlingí with things seemed to sometimes fix it but it always came back. Turns out a wire was damaged and would sometimes ground out but moving the wire would prevent the short sometimes. Just a thought.

Iíve replaced the ignition coil harness and checked the injector wire for continuity. I replaced the plug for cyl 6 since the contacts looked to be bent a little. No difference.


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Old Sat, Jun-23-2018, 02:43:46 PM   #13
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by bigjae1976 View Post
I just put on a different head/cams and the cylinders looked fine when I had the head off. Just did a valve adjustment and all of the valve shims were between .218 to .226.

I donít think timing is an issue because Iíve I had the misfire before and after removing the head.

Come to think about it...the only thing on the head that is the same is the VANOS.



What error codes did you get?


Just random misfire codes. Sometimes it would go into limp mode and cycling power would fix. These cars can be persnickety.


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Old Sat, Jun-23-2018, 03:14:36 PM   #14
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Default Re: Misfire Issue - Cyl 6

The fact that it's coming in and out and is not consistent leads to 2 things, variation of "something" with temperature somehow or electrical.

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Old Sat, Jun-23-2018, 03:50:35 PM   #15
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Default Re: Misfire Issue - Cyl 6

How about the knock sensor on that side of the engine?
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Old Sat, Jun-23-2018, 07:10:20 PM   #16
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by mrgizmo04 View Post
The fact that it's coming in and out and is not consistent leads to 2 things, variation of "something" with temperature somehow or electrical.

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It was going in and out...now itís consistent.


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Old Sat, Jun-23-2018, 07:11:06 PM   #17
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by Drewster View Post
How about the knock sensor on that side of the engine?

Interesting. Whatís your thought behind that?


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Old Sat, Jun-23-2018, 08:08:16 PM   #18
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by bigjae1976 View Post
Interesting. Whatís your thought behind that?


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It was a shot in the dark - looks like you've looked into most everything else (aside from physically deformed valves and VANOS?) - but it looks like most ECU's detect a misfire from how the crank wheel moves, not the knock sensor, so it's probably moot.
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Old Sat, Jun-23-2018, 08:56:14 PM   #19
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by Drewster View Post
It was a shot in the dark - looks like you've looked into most everything else (aside from physically deformed valves and VANOS?) - but it looks like most ECU's detect a misfire from how the crank wheel moves, not the knock sensor, so it's probably moot.

Definitely open to ideas!


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Old Sat, Jun-23-2018, 09:09:09 PM   #20
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by bigjae1976 View Post
Definitely open to ideas!


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Might as well look at cam sensors and the crank sensor.

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Discussing Misfire Issue - Cyl 6 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)