Car «jumps» on me

Billyboy · 08-10-2020, 02:25 PM

I live on the top of a small and steep hill, and whenever I fire up my ‘20 F90 and drive down the road while the cold start mode is running, the drivetrain is very unsettling. It seems the car does not like going at the 30 km/h speed limit. If I leave the gas, the car will brake itself way down to maybe 15-20 km/h, and if I give it a slight bit of gas, it will suddendly go to 40 km/h.

If I go to manual gearing, all is good - the car (obvoiusly) stays in gear, and I’m able to keep it nicely at the speed limit.

I’m considering complaining to my dealer, and maybe suggest they disable the cold start program as a workaround. The car is just fine with the cold start if I’m in a flat or uphill terrain. Anyone got opinions or similar experience?

brava09 · 08-10-2020, 03:18 PM

It does not like to be put in gear during the cold start. Can't you wait for 10 seconds for the cold start to finish before driving it? I rather enjoy the cold start sound while idling in my underground parking

Billyboy · 08-11-2020, 01:09 AM

Quote:

Originally Posted by brava09

It does not like to be put in gear during the cold start. Can't you wait for 10 seconds for the cold start to finish before driving it? I rather enjoy the cold start sound while idling in my underground parking

That is good advice I guess

probably reduces the wear and tear slightly too, in the long run. Thanks!

JK-M5 · 08-13-2020, 06:16 AM

agree with the above, let it warm up for 30 seconds before you move.

TrevorM3 · 08-13-2020, 07:38 PM

i thought this was basic knowledge, to let the idle drop before pulling away... jeez. lol

Billyboy · 01-06-2021, 11:37 AM

Technical Campaign 0012470500 Programming the control units actually made a difference here - the car is much more settled going down a steep downhill when cold now!

(from this thread: https://f90.bimmerpost.com/forums/sh....php?t=1783714)

08-10-2020, 02:25 PM	#1
Billyboy Enlisted Member 31 Rep 48 Posts Drives: 2020 M5 F90 Join Date: Aug 2019 Location: Norway iTrader: (0)	Car «jumps» on me I live on the top of a small and steep hill, and whenever I fire up my ‘20 F90 and drive down the road while the cold start mode is running, the drivetrain is very unsettling. It seems the car does not like going at the 30 km/h speed limit. If I leave the gas, the car will brake itself way down to maybe 15-20 km/h, and if I give it a slight bit of gas, it will suddendly go to 40 km/h. If I go to manual gearing, all is good - the car (obvoiusly) stays in gear, and I’m able to keep it nicely at the speed limit. I’m considering complaining to my dealer, and maybe suggest they disable the cold start program as a workaround. The car is just fine with the cold start if I’m in a flat or uphill terrain. Anyone got opinions or similar experience? Last edited by Billyboy; 08-10-2020 at 02:31 PM..
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08-10-2020, 03:18 PM	#2
brava09 Lieutenant Colonel 767 Rep 1,683 Posts Drives: M4C xdrive Join Date: Nov 2009 Location: Europe iTrader: (0)	It does not like to be put in gear during the cold start. Can't you wait for 10 seconds for the cold start to finish before driving it? I rather enjoy the cold start sound while idling in my underground parking __________________ 22 M4 Competition xdrive 19 M5 Competition sold 16 F-Type S AWD sold 11 Audi RS5 Misano Red--sold 08 E92 M3 Jerez Black 6MT--sold 08 E92 335i 6MT traded in for M3
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08-13-2020, 06:16 AM	#4
JK-M5 Second Lieutenant 61 Rep 240 Posts Drives: MBB F90 M5 Join Date: Jan 2016 Location: United Kingdon iTrader: (0)	agree with the above, let it warm up for 30 seconds before you move.
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08-13-2020, 07:38 PM	#5
TrevorM3 Banned 3322 Rep 8,083 Posts Drives: 6.3 AMG Join Date: Apr 2013 Location: Florida iTrader: (0)	i thought this was basic knowledge, to let the idle drop before pulling away... jeez. lol
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01-06-2021, 11:37 AM	#6
Billyboy Enlisted Member 31 Rep 48 Posts Drives: 2020 M5 F90 Join Date: Aug 2019 Location: Norway iTrader: (0)	Technical Campaign 0012470500 Programming the control units actually made a difference here - the car is much more settled going down a steep downhill when cold now! (from this thread: https://f90.bimmerpost.com/forums/sh....php?t=1783714)
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