[Alturiak]

Hi guys,

Hoping you can help me track down whats going on here. I have a 2011 335 N55 with PS2, FBO, and all the other goodies to go along with it. At 95k I replaced coils and plugs with OEM coils, and NGK 97506 plugs gapped to 0.020". At around 104k the car started to get misfires under WOT in 4th gear and I figured it was just because the plugs were used/old now and I was running upwards of 25psi. So I decided to wait it out to 105k at my next oil change and do everything at once. During this I changed the oil, the spark plugs with again NGK 97506 gapped to 0.020", and cleaned all my air filters. I fire the car up and take it out for a rip, and boom 4th gear again at around 5500rpm it misfires. I check the codes, and it reads:

Codes thrown in 4th gear:

2F02 cylinder 4 misfire
2EFE Random/multiple cylinder misfire detected
2EE0 Combustion misfiring, several cylinders, fuel injection deactivation
2EED Combustion misfiring, cylinder 4: fuel injection deactivation

So I figure it must be a bad coil somehow on cylinder 4. Okay so I swap coils between 4 and 2, putting #4 in the #2 and putting the known good #2 coil in #4 spot, hoping the problem would move to cylinder 2 and identify the coil as bad. I take the car out for another rip and happens again. Same thing, car rips hard until ~5500rpm in 4th gear and misfires- throws exactly the same codes.

So I think damn maybe its the brand new plug, not impossible right? So I swap plugs from 4 to 2 and vice versa and take it out for a rip and get the same codes under the same condition again.

At this point I'm a bit at a loss as the only other things I can think of are fuel injector (which I think is unlikely) or something with the cylinder compression. Car has no vacuum leaks or anything like that.

Any help or suggestions would be greatly appreciated!

[weehe126]

Check to make sure the wires on the #4 coil plug didn't push out, or that there isn't something causing it not to fully seat. Also check the ground and injector wiring.

[Alturiak]

So after checking with various other forums, it seems the fuel injector is likely the culprit. All wiring and connections were good, coil was not backed off of the plug or anything either. I'm going to install new injectors this weekend and I'll update after with the results

[tyson413]

Post a log at wot

[DiFFv1]

Question: Why gap 0.20 and not 0.22

[bbnks2]

Originally Posted by DiFFv1

Question: Why gap 0.20 and not 0.22

Why gap them down at all, honestly...

OP, might be time to troubleshoot the injector. What does the cyl 4 plug look like?

[DiFFv1]

Originally Posted by bbnks2

Why gap them down at all, honestly...

OP, might be time to troubleshoot the injector. What does the cyl 4 plug look like?

Enlighten me on why you wouldn't gap down your spark plugs? Just asking i run a tuned 335i. i run 95570 NGKs. if i didnt gap them down i would have a firework of misfires

[bbnks2]

Originally Posted by DiFFv1

Enlighten me on why you wouldn't gap down your spark plugs? Just asking i run a tuned 335i. i run 95570 NGKs. if i didnt gap them down i would have a firework of misfires

You do you. People gap down plugs for no reason all the time... and plenty others can get away without gaping their plugs down at all.

[DiFFv1]

Originally Posted by bbnks2

You do you. People gap down plugs for no reason all the time... and plenty others can get away without gaping their plugs down at all.

Thanks smarty pants. i was just asking a question for info. preciate ya

[Alturiak]

Hey guys wanted to post an update. So I replaced all the fuel injectors (and coded the new values in INPA) and took the car out for a test drive. It appeared to still misfire on cylinder 4, which was pretty frustrating, then towards the end on my way back home I accelerated hard but not full WOT in second gear and the engine shut off on me. A strange red oil light came on the dash lcd screen and the half engine light came on.. checked the codes and it had a misfire in cylinder 1 and the motor would not start again. The codes read camshaft sensor both intake and exhaust circuit short to ground.

Took it to my local shop, Eurowurx in Burbank, and he told me the spark plug in cylinder 1 had the tip exploded off, and the motor was failing a compression test measuring 0psi across all cylinders. He didn't get much past that to tell me if its the head or the bottom end of the motor because he was too busy. The car is currently at Minicorsa in North Hollywood for further diagnosis, but sounds like either way the head needs to be pulled.

I'm even more stumped over this than the misfiring. What could cause this? Could the timing chain jumping do something like what has happened?

[weehe126]

Crank hub probably slipped and valves in all cylinders hit pistons causing no compression. Only way the chain would slip is if the hydrologic tensioner failed which I have never heard of. Easiest way to confirm timing slipped is to pull the valve cover and see if the cams are off.

[Alturiak]

The shop currently suspects spun crank hub as well. They're pulling the valve cover today to find out and I'll update within the next couple days.

[weehe126]

Hopefully timing is just off and valves didn't hit pistons. You can still have 0 compression with everything fine but timing off, so there is hope.

[Chris_Rav]

Alturiak Any updates on this? I have been trying to track down a very similar misfire issue for the last few months. WOT >5k rpm will yield a half engine light and the car needs to be restarted to get any power out of the engine again.

[carlosg1016]

any updates on this im having problems with cyl4 misfiring

[TunafishE93]

Moral of story don't push car if its not running right... Who would of known..

[mhanson321]

Originally Posted by Alturiak

Hi guys,

Hoping you can help me track down whats going on here. I have a 2011 335 N55 with PS2, FBO, and all the other goodies to go along with it. At 95k I replaced coils and plugs with OEM coils, and NGK 97506 plugs gapped to 0.020". At around 104k the car started to get misfires under WOT in 4th gear and I figured it was just because the plugs were used/old now and I was running upwards of 25psi. So I decided to wait it out to 105k at my next oil change and do everything at once. During this I changed the oil, the spark plugs with again NGK 97506 gapped to 0.020", and cleaned all my air filters. I fire the car up and take it out for a rip, and boom 4th gear again at around 5500rpm it misfires. I check the codes, and it reads:

Codes thrown in 4th gear:

2F02 cylinder 4 misfire
2EFE Random/multiple cylinder misfire detected
2EE0 Combustion misfiring, several cylinders, fuel injection deactivation
2EED Combustion misfiring, cylinder 4: fuel injection deactivation

So I figure it must be a bad coil somehow on cylinder 4. Okay so I swap coils between 4 and 2, putting #4 in the #2 and putting the known good #2 coil in #4 spot, hoping the problem would move to cylinder 2 and identify the coil as bad. I take the car out for another rip and happens again. Same thing, car rips hard until ~5500rpm in 4th gear and misfires- throws exactly the same codes.

So I think damn maybe its the brand new plug, not impossible right? So I swap plugs from 4 to 2 and vice versa and take it out for a rip and get the same codes under the same condition again.

At this point I'm a bit at a loss as the only other things I can think of are fuel injector (which I think is unlikely) or something with the cylinder compression. Car has no vacuum leaks or anything like that.

Any help or suggestions would be greatly appreciated!

I just had the same issue 2011 335i xdrive changed plugs just as a preventive maintenance and felt like it had a slight hesitation. i followed all proper procedures... sure enough I get the cylinder number 4 misfire... I think coils. so I get a 6 pack and now I get multiple misfires on 1 and 3 and sometimes 4. put everything back in to what it was except cylinder number 5 plug because the gap was completely shut with no errors. and still have this stinking misfire. it'll drive but anything past 4th gear is almost enough to get yellow limp mode and shuts down cylinder 4 injector. I've tried clearing codes and idle is fine go through on the computer and shut down each injector individually and a rough idle happens as it should.... I'm so lost here and I never see any resolution on the forum just people dumping in parts..... grr help anyone?!?!?

[ghayes420]

Alturiak

Did you ever come up with a solution here for your misfires?

We are at a loss and could use some more advice. Thanks.