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Sharino Sharino is offline
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Join Date: Dec 2016
Car: 850i
Default Help with misfires - 08-11-2017, 01:51 PM

Helping a friend with a 535i 2008. Once warmed up it gets misfires on 4,5,6.

What has been done/changed: Plugs, coils, injector 5 only, carbon clean, smoke test, bank 2 pre *** wideband, tested dme for bad mosfets (no 30BB code anyways)

Ready to give up, one thing I noticed is after just a 3 minute idle *** 1 is very hot and *** for bank 2 is still cold to touch. Does that nean bank 2 *** isn't working? Fuel trims on bank 2 hit -30% also, tried resetting adaptations, runs better for a while then returns to misfires.

Any ideas?!? Really stumped.

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Vogt.ryan's Avatar
Vogt.ryan Vogt.ryan is offline
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Car: 2008 BMW 335i sport
Default 08-11-2017, 07:13 PM

Swap your injectors from bank 1 to bank 2 and see if the pattern follows or stays the same

2008 335i Sport Jb4, MHD BEF, Alpina flash, Uncatted *****, PE Mod, Injen Intake, v710's , Vogtland Springs
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Sharino Sharino is offline
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Car: 850i
Default 08-14-2017, 06:34 PM

swapped injectors, recoded no difference. Really thinking *** is gone, can somebody please let me know if that sounds reasonable with what i described
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Car: 135i
Default 08-15-2017, 12:32 PM

You'd need to log but sounds like it may be O2 sensor or something of that nature.

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