09 335i automatically accelerating and decelerating - BMW 3-Series (E90 E92) Forum

ericruiz911 · 10-31-2012, 11:02 AM

Hey everyone,

Car is currently at the dealer because I was doing maybe 70 holding constant and I started feeling a slight jerk back and forth. I switched to live MPG on dash and it was jumping from 32 to 26 and back and forth. I would accelerate and it would be fine until I would hold it at a constant speed. The dealer cannot seem to duplicate. Has Anyone ever experienced this?

volkswackin · 10-31-2012, 08:56 PM

Quote:

Originally Posted by ericruiz911

Hey everyone,

Car is currently at the dealer because I was doing maybe 70 holding constant and I started feeling a slight jerk back and forth. I switched to live MPG on dash and it was jumping from 32 to 26 and back and forth. I would accelerate and it would be fine until I would hold it at a constant speed. The dealer cannot seem to duplicate. Has Anyone ever experienced this?

Only thing I've had give that sensation in an n54 engine is carbon buildup

ericruiz911 · 11-04-2012, 01:23 PM

Well dealer figured it out. 3 injectors were clogged so it looks like the ECU was trying to compensate AFR to fuel PSI and it was fluctuating causing this. Hopefully get her back monday

markusvt · 11-04-2012, 08:08 PM

Any codes?

Quote:

Originally Posted by ericruiz911

Well dealer figured it out. 3 injectors were clogged so it looks like the ECU was trying to compensate AFR to fuel PSI and it was fluctuating causing this. Hopefully get her back monday

ericruiz911 · 11-05-2012, 12:05 PM

Quote:

Originally Posted by markusvt

Any codes?

I post a copy of the service receipt once I get the car back. Thursday makes it 2 weeks at the dealer

10-31-2012, 11:02 AM	#1
ericruiz911 Second Lieutenant Drives: 2009 335i Sedan Join Date: May 2012 Location: MIAMI, FL Posts: 265 iTrader: (0)	09 335i automatically accelerating and decelerating Hey everyone, Car is currently at the dealer because I was doing maybe 70 holding constant and I started feeling a slight jerk back and forth. I switched to live MPG on dash and it was jumping from 32 to 26 and back and forth. I would accelerate and it would be fine until I would hold it at a constant speed. The dealer cannot seem to duplicate. Has Anyone ever experienced this?
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11-04-2012, 01:23 PM	#3
ericruiz911 Second Lieutenant Drives: 2009 335i Sedan Join Date: May 2012 Location: MIAMI, FL Posts: 265 iTrader: (0)	Well dealer figured it out. 3 injectors were clogged so it looks like the ECU was trying to compensate AFR to fuel PSI and it was fluctuating causing this. Hopefully get her back monday