2014 F10 - RPM Drop on Cold Start

ryansbmw · 04-18-2021, 11:23 PM

For the past few weeks with the warmer weather, car has been running fine. This past weekend I drove out to Cleveland. It was in the 30s one morning and sure enough, first cold start of that morning, very rough and stumbling idle. No codes....

undftdrew · 10-23-2021, 01:07 AM

I went thru the same problem for months tried everything did walnut blasting my self smoothed out the idle but didn't solve the problem then i tried spark plugs and coil packs also did nothing I even replaced my injectors and the problem still persisted the only thing left was the Vanos Solenoids !! they were the culprit change the intake and exhaust solenoid together and it solves the problem totally and its an easier repair than than everything else Ive done to slove the problem space is limited but with the right pick tools it is easy work.

550bye · 10-29-2021, 11:39 PM

O2 sensors fixed the idle issue for me, cold start would drop and idle at 500 rpm's at all times. Replaced the O2's and it went back to normal. Not saying that's your fix, but you may want to take a look at it

ryansbmw · 01-07-2022, 07:57 AM

Cold weather is back...rough idle and some stalling is back. Im at least getting some codes now. Codes point to valvetronic motor. Hopefully its just the motor that needs to be replaced and not the eccentric shaft as well.

N55ight · 02-02-2022, 05:13 PM

Quote:

Originally Posted by ryansbmw

Cold weather is back...rough idle and some stalling is back. Im at least getting some codes now. Codes point to valvetronic motor. Hopefully its just the motor that needs to be replaced and not the eccentric shaft as well.

Ever figured it out?

Trainwreck914 · 02-03-2022, 11:25 AM

My wife's X5 had a bad injector. #5. Replaced #5 & 6. As well as the hpfp. It does not drop rpm's anymore.

04-18-2021, 11:23 PM	#67
ryansbmw Lieutenant 181 Rep 551 Posts Drives: 2013 X5 35i M-Sport, 2010 535x Join Date: Jun 2017 Location: NJ iTrader: (1)	For the past few weeks with the warmer weather, car has been running fine. This past weekend I drove out to Cleveland. It was in the 30s one morning and sure enough, first cold start of that morning, very rough and stumbling idle. No codes.... __________________ VRSF CP & DP \| BMS Intake \| MHD 2+ Tune \| BavSound Stage 1 \| 20% Tint Need coding or modules reset? PM me
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10-23-2021, 01:07 AM	#68
undftdrew New Member 2 Rep 5 Posts Drives: 16' F10 535i M-Sport Join Date: Oct 2021 Location: Los Angeles iTrader: (0)	It may not be the walnut blast after all !!! I went thru the same problem for months tried everything did walnut blasting my self smoothed out the idle but didn't solve the problem then i tried spark plugs and coil packs also did nothing I even replaced my injectors and the problem still persisted the only thing left was the Vanos Solenoids !! they were the culprit change the intake and exhaust solenoid together and it solves the problem totally and its an easier repair than than everything else Ive done to slove the problem space is limited but with the right pick tools it is easy work.
	Appreciate 0 Quote

10-29-2021, 11:39 PM	#69
550bye Second Lieutenant 1391 Rep 262 Posts Drives: 2011 550i Join Date: Dec 2018 Location: Utah iTrader: (0) Garage List 2011 BMW 550i [5.67]	O2 sensors fixed the idle issue for me, cold start would drop and idle at 500 rpm's at all times. Replaced the O2's and it went back to normal. Not saying that's your fix, but you may want to take a look at it __________________ 2011 550i (N63) Upgraded 51mm turbos, Heatsync Stage 3 Flash, JB4 stacked, BMS WMI, Arm Charge Pipes, Heatsync Catless DPs, X-Pipe, Res Muffler Delete, xHP Stage 3 Trans Flash, Turbosmart Diverter Valves, 3.5 TMAPs, Oil Cooler, Heatsync Front Mounted Max Cool Intakes, Walbro LPFP and e40 mix rollin on Stance SF07 9x20 w/Toyo Extensa and 10.5x20 w/Toyo R888R.
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01-07-2022, 07:57 AM	#70
ryansbmw Lieutenant 181 Rep 551 Posts Drives: 2013 X5 35i M-Sport, 2010 535x Join Date: Jun 2017 Location: NJ iTrader: (1)	Cold weather is back...rough idle and some stalling is back. Im at least getting some codes now. Codes point to valvetronic motor. Hopefully its just the motor that needs to be replaced and not the eccentric shaft as well. __________________ VRSF CP & DP \| BMS Intake \| MHD 2+ Tune \| BavSound Stage 1 \| 20% Tint Need coding or modules reset? PM me
	Appreciate 0 Quote

02-03-2022, 11:25 AM	#72
Trainwreck914 Lieutenant 132 Rep 452 Posts Drives: BMW F10 F15 E39 E90 E53 Join Date: Dec 2019 Location: NY CT iTrader: (0)	My wife's X5 had a bad injector. #5. Replaced #5 & 6. As well as the hpfp. It does not drop rpm's anymore.
	Appreciate 0 Quote