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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > **First Time Tuners** Start Here** Official Misfire Thread| Updated!



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      03-11-2018, 07:07 AM   #309
dpaul
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Forgot to mention, had also replaced bank 2 pre-cat O2 sensor (cyl 4-6; it was accidently damaged during downpipe installation). Also want to emphasize, misfire only occurs when engine is cold, almost always on cyl 6. Once warmed up, WOT is fine. Sound like an injector, I know, but injector swap/replacement did not affect the problem.

Last edited by dpaul; 03-11-2018 at 07:13 AM.
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      03-11-2018, 11:31 AM   #310
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Guy's I've also been through the misfire nightmare. And totally understand the frustration your dealing with. What resolved it after I went through new plugs, coils, and ebay injectors was pre-cat O2 sensors. If you have misfires on 2 cyls on the same bank and your car has close to 100-120K you should look at the precat O2 sensor on that bank. I'm no mechanic but it fixed it for me. I did not have any codes that lead me to believe it was an O2 sensor. Just the fact that I had multiple misfires on Bank 2. cyl4 cyl5 and cyl6 at different times and often 4 and 6 at the same time. Look at your old history and see if you have misfires related to the same bank.

Also please post what your fix is after you have nailed it down. Way to often people fix the issue but never report what actually fixed it. Misfire issue on our cars could be 20 different factors and a real pain to troubleshoot.


Just curious if you reset your adaptations after replacing your O2 sensors? I think this helped my car. Not sure this is necessary as your now running catless DP's.
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Originally Posted by dpaul View Post
Forgot to mention, had also replaced bank 2 pre-cat O2 sensor (cyl 4-6; it was accidently damaged during downpipe installation). Also want to emphasize, misfire only occurs when engine is cold, almost always on cyl 6. Once warmed up, WOT is fine. Sound like an injector, I know, but injector swap/replacement did not affect the problem.
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      03-12-2018, 01:13 AM   #311
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I have couple of questions:

1. Are coil packs bank/cylinder group specific? Can I swap one from any cylinder to test with another?

2. Just to make 100% sure, no coding needed after new coil packs are installed, correct?
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      03-12-2018, 11:31 AM   #312
GEOS07335i
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Quote:
Originally Posted by tdli View Post
I have couple of questions:

1. Are coil packs bank/cylinder group specific? Can I swap one from any cylinder to test with another?

2. Just to make 100% sure, no coding needed after new coil packs are installed, correct?
1) coil packs are not group specific. Yes you can swap them out for testing thats what we all do for checking misfire issues

2) no coding required for coils. Your thinking of fuel injectors.
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      03-12-2018, 11:41 AM   #313
tdli
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Quote:
Originally Posted by GEOS07335i View Post
Quote:
Originally Posted by tdli View Post
I have couple of questions:

1. Are coil packs bank/cylinder group specific? Can I swap one from any cylinder to test with another?

2. Just to make 100% sure, no coding needed after new coil packs are installed, correct?
1) coil packs are not group specific. Yes you can swap them out for testing thats what we all do for checking misfire issues

2) no coding required for coils. Your thinking of fuel injectors.
Thanks so much!
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      03-25-2018, 04:59 AM   #314
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I'm new to this platform but have about 15 years of experience with tuning cars. I just picked up an 09 335 xdrive, I installed MHD and did some logs of a stage 0 tune and my AFRs are in the mid 13's under boost and I'm getting timing correction on all cylinders. I just want to get some input from my logs.
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      05-31-2018, 08:00 PM   #315
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I have been having some drivetrain issues (maybe) and am too much of a noob to create my own post at the moment. My car took a dump on me a month ago and as I've been waiting for my Spec stage2+ clutch kit and MFactory SMF to come in, I installed bolt ons, MHD tune and koni shocks and struts replacing all bushings on the way. I took my car to BMW of SD for a diagnostic when I suspected the clutch went out (Huge clank with a drop feeling) accelerating after a turn. I did the clutch and with my rear tires up, went through reverse, 1st and 2nd gear smoothly it all sounded good. With the car on the floor, I get this clanking sound coming from where the driveshaft meets the rear differential and cant really accelerate. Somebody help please!

Thanks here is a video of the issue with general description.
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      06-15-2018, 01:31 PM   #316
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The misfires and other problems on these cars is exhausting. The amount of time I spend replacing coils, plugs, injectors, vanos, water pumps, crank position sensors is 10 times what I spend on my FORD Mustang.

Mine is now misfiring mostly under light load or at idle. Most of the time it behaves well under WOT conditions.

I replaced the valve cover gasket (was leaking pretty bad) all the plugs, coils and the exhaust Vanos. I cleaned the intake Vanos. It is better, but the car still misfires pretty bad sometimes. It doesn't seem to be consistent. Some days are good and some are no so good. I think hot days seem to be the worse.
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      06-15-2018, 02:03 PM   #317
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Quote:
Originally Posted by beetle6986 View Post
The misfires and other problems on these cars is exhausting. The amount of time I spend replacing coils, plugs, injectors, vanos, water pumps, crank position sensors is 10 times what I spend on my FORD Mustang.

Mine is now misfiring mostly under light load or at idle. Most of the time it behaves well under WOT conditions.

I replaced the valve cover gasket (was leaking pretty bad) all the plugs, coils and the exhaust Vanos. I cleaned the intake Vanos. It is better, but the car still misfires pretty bad sometimes. It doesn't seem to be consistent. Some days are good and some are no so good. I think hot days seem to be the worse.
I was in the same boat, i highly recommend switching to JB4+MHD backend, this will solve your timing issues
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      06-19-2018, 06:12 PM   #318
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Persistent Misfire in Cylinder 3

I'm getting a persistent misfire in cylinder 3. New plugs, new coils; swapped new plugs and coils in cylinders 3 and 1; misfire stays in cylinder 3.

Time to replace injectors? Looks like my current ones are index 7.

126,000 miles, completely stock.

I've read through this thread, just praying I can find an answer.
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      06-19-2018, 07:26 PM   #319
GEOS07335i
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Did you swap injector 3 into another cylinder to rule it out. I have an 08 and mine went right around the same milalage
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      06-19-2018, 08:45 PM   #320
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Quote:
Originally Posted by GEOS07335i View Post
Did you swap injector 3 into another cylinder to rule it out. I have an 08 and mine went right around the same milalage
That's a good idea. I don't have a tool to pull the injectors right now, but I was planning on purchasing one anyhow if/when I replace the injectors.

Are there any concerns with swapping injectors without replacing the seal? Obviously I'd try to do it quickly.
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      06-28-2018, 07:03 PM   #321
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Misfire Cylinder 3

Had a "Misfire Cylinder 3" code. Rough idle, rough acceleration.

- new plugs
- new coils
- cleaned intakes
- replaced VCG (not intended to fix the misfire but it needed to be done)
- new injectors

Put it back together and "Misfire Cylinder 3". What's next? Bank 1 pre-cat O2 sensor? I just ordered one. No idea what else it could be. Wiring harness?
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      07-17-2018, 10:06 AM   #322
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Quote:
Originally Posted by b92 View Post
I was in the same boat, i highly recommend switching to JB4+MHD backend, this will solve your timing issues
I haven't been online for a while. So you think it may be timing related? Maybe I should run some logs and see if anything interesting shows up under light load when the car seems to be misfiring. It looks like the MHD requires an android device.
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      07-17-2018, 10:25 AM   #323
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Quote:
Originally Posted by beetle6986 View Post
I haven't been online for a while. So you think it may be timing related? Maybe I should run some logs and see if anything interesting shows up under light load when the car seems to be misfiring. It looks like the MHD requires an android device.
I was chasing misfires for months before I bought & installed an intercooler and flashed MHD. Misfires went away immediately and I fell in love with my car all over again.

MHD costs:
- Cheap Android Tablet - $70 (I got a refurbed Galaxy Tab from Walmart)
- DCAN cable: $25
- MHD BEF flasher: $79
- Total: $174
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