BMW 3-Series (E90 E92) Forum - View Single Post - N52 - Stumbling/misfires on heavier acceleration

NumericalIntegration · 12-13-2019, 09:18 PM

Like the title says, I get sporadic stumbling/misfires when at about 3/4 throttle or more. It tends to happen more at lower revs (2-3k). I can have INPA open in the passenger seat and get it to stumble/misfire but no codes show up. I recently replaced the intake VANOS solenoid and the #4 injector to fix previous codes. After I replaced these two it pulled cleanly as far as I can recall. Anyone have any suggestions or have expericed the engine stumbling but no codes being set?

The car is a manual 325i with 148k and a 3IM with the BimmerLabs 330i tune.

12-13-2019, 09:18 PM	#1
NumericalIntegration New Member 3 Rep 19 Posts Drives: 2008 Z4 3.0si Join Date: May 2018 Location: Charlotte, NC iTrader: (0)	N52 - Stumbling/misfires on heavier acceleration - get no codes Like the title says, I get sporadic stumbling/misfires when at about 3/4 throttle or more. It tends to happen more at lower revs (2-3k). I can have INPA open in the passenger seat and get it to stumble/misfire but no codes show up. I recently replaced the intake VANOS solenoid and the #4 injector to fix previous codes. After I replaced these two it pulled cleanly as far as I can recall. Anyone have any suggestions or have expericed the engine stumbling but no codes being set? The car is a manual 325i with 148k and a 3IM with the BimmerLabs 330i tune.
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