[tgreer]

Hi,

I've been having issues with my 56 plate with misfiring, shutting off injectors and a mixture of CEL and EML. Lots of 2D92.

So far I've had new plugs, new coils, stopped an oil leak from the rocker cover, and a new injector in Cylinder 6. I've also just had the inlet valve ledge replaced due to one or two (over 4 month ownership) VANOS errors (2A82). It's also had a new water pump and 2 new turbos prior to these errors.

I still get misfire detected cylinder 6, and according to Carly freezeframe it's at 5984rpm. Clearing the codes and repeating the process of accelerating upto/past this rpm ensures the EML comes back on.

Any pointers? Getting a bit peeved now.

[Texus]

Swap plugs/coils. You may have a bad one.

[tgreer]

Originally Posted by Texus

Swap plugs/coils. You may have a bad one.

Done this already. It doesn't move. Also swapped injectors.

[tgreer]

Originally Posted by BimmerGeeks

How does the rough/smooth running values look on 6 compared to the others?

I don't have access to that info, I'd need to get CPC to plug in again.

[TheeGovernor]

Well it looks like you have swapped/replaced all the parts for that cylinder. Consider a bad mosfet in your dme or doing a compression test on cylinder #6.

[tgreer]

Originally Posted by BimmerGeeks

Don't you have Carly?

Ah, didn't realise Carly gives me that info. Would it be under a different parameter name?

[tgreer]

Originally Posted by BimmerGeeks

Should be smooth or rough running

'not smooth cylinder X' that'll be it.

Would the figures without the error be relevant, or just when it registers a misfire?

[STR8-6IX]

Originally Posted by TheeGovernor

Well it looks like you have swapped/replaced all the parts for that cylinder. Consider a bad mosfet in your dme or doing a compression test on cylinder #6.

this. my guess is something electronic/DME related.

[absentmathis]

Originally Posted by tgreer

Done this already. It doesn't move. Also swapped injectors.

So did you put a new injector on cyl 6 or swap another one to it? I had a similar inexplicable misfire on mine and I swapped injectors (and coil and plug and tested compression) and the misfire stayed on the same cylinder. Took it to my favorite indy and they diagnosed injectors. I refused to believe it because the misfire would not move off of the one cylinder, but replacing a bank of three cured it. I cannot explain it.

[tgreer]

Originally Posted by absentmathis

So did you put a new injector on cyl 6 or swap another one to it? I had a similar inexplicable misfire on mine and I swapped injectors (and coil and plug and tested compression) and the misfire stayed on the same cylinder. Took it to my favorite indy and they diagnosed injectors. I refused to believe it because the misfire would not move off of the one cylinder, but replacing a bank of three cured it. I cannot explain it.

So given they're in 2 banks, if I move all 3 injectors from 1-3 to 4-6 should I see it going away to another cylinder?

EDIT: It was a brand new Injector into 6. We swapped with Cyl 1 afterwards to rule out individual injector failure.

[X_Drive]

Have you ever had a carbon media blast performed for your intake valves?

[tgreer]

Originally Posted by X_Drive

Have you ever had a carbon media blast performed for your intake valves?

That's next on the list.

Although I'm being told this is down to my DMFW, so I have a new one + new clutch being fitted next week @ CPC.

If this doesn't solve it, I don't know what will. CPC don't have any more ideas.

[feuer]

Originally Posted by TheeGovernor

Well it looks like you have swapped/replaced all the parts for that cylinder. Consider a bad mosfet in your dme or doing a compression test on cylinder #6.

Originally Posted by STR8-6IX

this. my guess is something electronic/DME related.

Or enlarged injector socket.

[JuniorB]

There is a tread somewere that the number 6 misfire still continuing after all that's replaced, could be from the oem flywheel. Guys running higher hp who experience the same systems, done the same procedure as you, has determined the flywheel is causing the misfire, there is a tread about it and it's been repaired by replacing it with a single mass flywheel. I'm sure others will confirm. Only on 6 tho. Hope this helps, M Factory are building flywheels just for this.

[07lilredwagon]

just a shot in the dark, but is the wiring/connectors going to that coil in good shape and test well?

JP

[tgreer]

Originally Posted by JuniorB

There is a tread somewere that the number 6 misfire still continuing after all that's replaced, could be from the oem flywheel. Guys running higher hp who experience the same systems, done the same procedure as you, has determined the flywheel is causing the misfire, there is a tread about it and it's been repaired by replacing it with a single mass flywheel. I'm sure others will confirm. Only on 6 tho. Hope this helps, M Factory are building flywheels just for this.

Doing a flywheel this week. Going for a new dual mass though, do not want single mass chatter. This is a daily drive.

Wires all look in good condition don't see any breakages.

[Rivers]

Just curious you said you put a new injector in cyl 6? what was the index on it?
if its 12 you have to make sure in cyl 5 and cyl 4 are 10 and up (I believe). Index 12 don't play well with others for some reason. Also make sure they code it.

I just had the same problem constant misfire on cyl 6 did the spark/coils too but kept on misfiring on 6. So I just decided to replace all injectors with Index 12 (had 2 index 5 and 4 index 9) and now the car runs like its brand new. I hope this helps.

[GeneralMitch]

I'm in the same boat as you right now..

Had intermittent misfires since Oct '16. Changed both turbos with new OEM turbos. All Sparks, All Coils, Exhaust Sensors, Just changed all 6 injectors over the weekend however now its misfiring only after a quick WOT. Can't fathom what it is ! Driving me nuts!

[pedrol]

My stealership is pushing a walnut blast... They're telling me these direct injection intake manifolds have terrible carbon buildup... Recommend every 35k... I'm at 88k, and the coil replacement did the trick for me...the walnut blast is about $800

[JuniorB]

After you run down the obvious,the dual mass seems to cause misfires when running higher horsepower, check the other form about the flywheel, if your in there, look into changing it. Guys are going with a single for this reason.

[RCS328]

I just had a persistent misfire in cyl 5. Changed all coils and plugs since they were due. Still threw the code every now and again. Plus in 6th under high load if you punched it the car would mis. So had a walnut blast done and I think I got 50 hp back. Totally different car now.

[tgreer]

Well, we done the DMFW + Clutch, didn't fix it.

We had a look at the ports, and they're not as bad as others, although I'm still going to get the walnut blasting done.

More investigating, found that one of the ports on the intake side for cylinder 6 wasn't opening. Turns out the finger(?) had come off.

That's been reattached and now no more misfires on cylinder 6 at 6k+ rpm.

Thanks to CPC for battling through with this.