I'm noticing in my 535 that between 2500-4500/5000 rpm, the car will have a couple hiccups through the rpm range. No CEL, only happens under heavy load. Replaced coils/plugs, no change. Could this be the LPFP?
Last edited by extra; 04-23-2020 at 11:06 PM.
F10 535i
Formerly Owned:
2000 540i/6
E23 733i
E90 M3
E53 X5
Doubtful it's the LPFP. The DME is pretty sensitive to drops in fuel pressure and would probably turn on the check engine light. Is your car xdrive?
ASE and BMW Master Certified Technician
Carbon build up?
I bet it's the transfer case. Unplug it and go for a drive.
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ASE and BMW Master Certified Technician
Underneath the car. Find the transfer case. There's a square electrical plug. Squeeze the locking tab and unplug it. You will certainly set off all kinds of warning lights on the dash, but you can drive normally.
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ASE and BMW Master Certified Technician
What makes the transfer case go? Low oil?
2002 525i
No, I don't think I've ever seen one leak. Probably just wear out over time. The F15 transfer cases go out all the time. They start binding up and you can feel it when making low-speed, hard turns (like parking lot maneuvering).
ASE and BMW Master Certified Technician
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