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      11-19-2022, 03:12 PM   #1
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Unhappy N54 Misfire Diagnoses Help!

I've posted once before but I haven't gotten a reply so, I'll give the whole story with what I've already tried once more before getting it towed to a shop.

Drove my car all day and at night as I'm going home I floor it at a light once its green. I turn and pull into a parking lot and realize the car is badly misfiring. The car ends up dying and shutting off. I start it and it struggles to start, however once it does the rpms almost drop low enough to shut off I tap the accelerator enough tot get home. Luckily I was close. CODES: 2D2E THORTTLE-VALVE ANGLE - INTAKE MANIFOLD VACCUM, CORRELATION. 29D2 MISFIRE CYLINDER 6.

I reset my throttle, through MHD and regular way as well. Reflashed the car back to stock.

THROTTLE code appeared, no throttle response extreme bouncing of RPMS 500-1500. Issue disappeared after disconnecting battery.
After a couple start-ups with misfires, the throttle codes seemed to have disappeared all I was left with was, 29D2 Misfire Cylinder 6, and eventually all cylinder combustion misfire. I replace spark plugs and coils with brand new OEM ones. NOTE: OLD Front spark plug threads covered in oil due to spill, however rears were dry.

I start the vehicle and I hear a weird loud sound, and feel misfires so I turn it off quickly. Same codes come back Cylinder 6 misfire, Throttle-valve angle.


BACKGROUND INFO ON CAR:
2009 N54 XDRIVE
153,000KM (94K?? miles)
Stage 1+ (DCI, OCC, FMIC, CP, BOV.)
INDEX 9 Original Leaking injectors
I believe original HPFP as well.

If anymore info is needed please ask. I hope these details may help any of you determine what could be going on or how I can move forward to diagnose.
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      11-21-2022, 10:37 AM   #2
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Anyone?
I have inpa installed as well, however I donít know how to use it well. I havenít used it yet. Maybe diagnostics from that would help?
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      11-21-2022, 12:04 PM   #3
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I would verify no vac leak and mechanical (compression) is good. then swap injectors (i would replace them anyways).
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      11-21-2022, 01:06 PM   #4
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Injector 6 getting stuck open.

Replace injector.

As a matter of fact replace all of those garbage index 9s.
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      11-21-2022, 02:22 PM   #5
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Quote:
Originally Posted by Wolf 335 View Post
Injector 6 getting stuck open.

Replace injector.

As a matter of fact replace all of those garbage index 9s.
Yeah I was trying to go as long as possible without spending 4k+ for new ones I guess I have to now Iíll compression test and then Iíll replace them thanks for the response.
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      11-21-2022, 02:25 PM   #6
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Quote:
Originally Posted by 335i54n View Post
I would verify no vac leak and mechanical (compression) is good. then swap injectors (i would replace them anyways).
Thanks I have already checked vacuum Iíll get a compression kit and check. These index 9ís were gonna go soon enough anyways.
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      11-21-2022, 02:42 PM   #7
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you can do used 12's and have them cleaned and regenerated. not a common failure but you can also pop the tb cover and inspect the gears.
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      11-21-2022, 11:05 PM   #8
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Quote:
Originally Posted by 335i54n View Post
you can do used 12's and have them cleaned and regenerated. not a common failure but you can also pop the tb cover and inspect the gears.
Sure Iíll check that as well. Thanks so much. I know eBayís not a good source for used index 12ís, anywhere else I could get them ? Iím working on Facebook marketplace and Kijiji nothing in my area. I might try FB marketplace in other places and see if anyone is willing to ship.
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      11-22-2022, 02:10 AM   #9
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Why not replace the single cyl6 injector if compression is good?
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      11-22-2022, 09:26 AM   #10
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Quote:
Originally Posted by Serf27 View Post
Why not replace the single cyl6 injector if compression is good?
I think he mentioned that all of his injectors are leaking.
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      11-22-2022, 09:35 AM   #11
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Quote:
Originally Posted by Wolf 335 View Post
I think he mentioned that all of his injectors are leaking.
Yes they are Iíve been planning to replace them all anyways.
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