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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, 02:48:05 AM   #1
bigjae1976
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Default Misfire Issue - Cyl 6

My engine has a miss on cyl 6 and the ECU throws code 51 (ign coil #6).

Here's the background. I bought the motor with 93k on it. Did the rod bearings and VANOS on it. Motor looked solid. Ran well until I took it to the track a couple of weeks ago.

On track, I would get an intermittent miss. I would come into the paddock and then it would go away. I finally got the miss to occur in the paddock. Swapped a coil pack and it was good to go. I tow the car home and then the miss is back. This time, it didn't go away with a coil pack swap.

Here's what I've done...

1. Swapped ignition coils, miss remains on cyl 6
2. Installed a new spark plug (OEM NGK)
3. Replaced ignition coil harness
4. Replaced fuel injector plug (looked suspect)
5. Replaced fuel injector
6. Swapped fuel injector
7. Replaced head gasket

I decided to do the head gasket because I wanted to try and get the car on track. The fact that the miss started occurring when the engine was hot was a clue. It was 10 days out and I was at a point where I either needed to just do it or pray the HG wasn't the issue. I had brown coolant as well so I had my suspicions. I had all of the parts and an extra head on hand. Head was cleaned and checked out OK. Surface was flat. The block and cylinder walls all looked good.

I get voltage at the coil and the fuse checks out.

The only thing left is the DME. Thoughts?
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Old Sat, Jun-23-2018, 03:12:59 AM   #2
icecream
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Default Re: Misfire Issue - Cyl 6

Quote:
Originally Posted by bigjae1976 View Post
My engine has a miss on cyl 6 and the ECU throws code 51 (ign coil #6).

Here's the background. I bought the motor with 93k on it. Did the rod bearings and VANOS on it. Motor looked solid. Ran well until I took it to the track a couple of weeks ago.

On track, I would get an intermittent miss. I would come into the paddock and then it would go away. I finally got the miss to occur in the paddock. Swapped a coil pack and it was good to go. I tow the car home and then the miss is back. This time, it didn't go away with a coil pack swap.

Here's what I've done...

1. Swapped ignition coils, miss remains on cyl 6
2. Installed a new spark plug (OEM NGK)
3. Replaced ignition coil harness
4. Replaced fuel injector plug (looked suspect)
5. Replaced fuel injector
6. Swapped fuel injector
7. Replaced head gasket

I decided to do the head gasket because I wanted to try and get the car on track. The fact that the miss started occurring when the engine was hot was a clue. It was 10 days out and I was at a point where I either needed to just do it or pray the HG wasn't the issue. I had brown coolant as well so I had my suspicions. I had all of the parts and an extra head on hand. Head was cleaned and checked out OK. Surface was flat. The block and cylinder walls all looked good.

I get voltage at the coil and the fuse checks out.

The only thing left is the DME. Thoughts?
You tried new coils or swapped around old coils?
Did you ever try a different spark plug (I assume you ised the ngkdcpr8 platinum? Did you damage or try to gap the plug (I dont think you are supposed to gap platinum or iridiums?
How old are the plugs and coils on the motor?

Last edited by icecream; Sat, Jun-23-2018 at 03:16:33 AM.
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Old Sat, Jun-23-2018, 03:20:54 AM   #3
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by icecream View Post
You tried new coils or swapped around old coils?
Did you ever try a different spark plug (I assume you ised the ngkdcpr8 platinum? Did you damage or try to gap the plug (I dont think you are supposed to gap platinum or iridiums?
How old are the plugs and coils on the motor?

Both new and used coils. Iíve swapped coils in other cylinders and the code is still for cyl 6. Iím using a new plug, whatever the OEM NGK part is. No, youíre not supposed to gap them.

The ignition coils are 1000 mile old Bosch, injectors were rebuilt around the same time and the plugs are all new.


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Old Sat, Jun-23-2018, 03:49:28 AM   #4
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Default Re: Misfire Issue - Cyl 6

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Originally Posted by bigjae1976 View Post
Both new and used coils. I’ve swapped coils in other cylinders and the code is still for cyl 6. I’m using a new plug, whatever the OEM NGK part is. No, you’re not supposed to gap them.

The ignition coils are 1000 mile old Bosch, injectors were rebuilt around the same time and the plugs are all new.


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So try this then. Find a cliff and push the car off.

But id replace that spark plug with a fresh one again before anything more drastic. Other than that not sure what could be the problem. Sucky for sure. Out of curiosity how does it run? Does it go into limp mode?
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Old Sat, Jun-23-2018, 06:06:07 AM   #5
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Default Re: Misfire Issue - Cyl 6

I had an intermittent crank sensor issue in my other car. It ended up being the harness connectors were folded down too far and weren’t making good contact with the crank sensor. I opened up the connectors and bent them back to factory position and it solved the problem. Worth a shot
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Old Sat, Jun-23-2018, 11:37:42 AM   #6
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Default Misfire Issue - Cyl 6

Quote:
Originally Posted by icecream View Post
So try this then. Find a cliff and push the car off.

But id replace that spark plug with a fresh one again before anything more drastic. Other than that not sure what could be the problem. Sucky for sure. Out of curiosity how does it run? Does it go into limp mode?

Just has a miss. Hasnít ever went into limp mode. No SES or EML light which is odd.


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Old Sat, Jun-23-2018, 01:46:18 PM   #7
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Default Re: Misfire Issue - Cyl 6

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.


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Old Sat, Jun-23-2018, 01:48:20 PM   #8
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Default Re: Misfire Issue - Cyl 6

Swap injectors. 'Rebuilt' means someone other than the factory messed with them, which IMO is usually a begative thing.
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Old Sat, Jun-23-2018, 02:17:40 PM   #9
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Default Re: Misfire Issue - Cyl 6

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.

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Old Sat, Jun-23-2018, 02:30:51 PM   #10
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Default Re: Misfire Issue - Cyl 6

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 ‘fiddling’ 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.
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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)