No more cold start
Thread Starter
Member
Joined: Mar 2010
Posts: 106
Likes: 20
2021 GLE63S
No more cold start
After leaving my car for about a week, I noticed that when first started, cold start was not enabled and the engine just ran at hot idle speed. When I switched it off and then restarted, cold start became enabled.
Only happens if car is left for a week or so.
Any ideas?
Only happens if car is left for a week or so.
Any ideas?
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Joined: Jun 2014
Posts: 1,589
Likes: 683
From: IL
19 E63s, 23 M3 compX, B9 SQ5
What I've noticed is if you keep your foot on the brake pedal firm while starting, it's going to do the loud cold start then reduce to normal idle. If you get your foot off the brake quickly after starting it starts and immediately goes to normal idle.
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Joined: Dec 2013
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My individual mode uses Sport drivetrain setting and I noticed that the latest update caused an intermittent abrupt/hard downshift into 1st when coming to a gentle stop ... at first (pun intended). However, it "trained out" after a few hours of (mixed city/highway) driving and is now back to only downshifting to 1st when the car comes to a complete stop (i.e., as it did before the update). On the plus side, it seems that the transmission is now smoother in city traffic. From a short test in Race mode, that seems to be the same (i.e., still wonderful). Oh, mine is a 2016 C63 S, so has the 7-speed transmission.
Senior Member
Joined: Jul 2010
Posts: 424
Likes: 41
From: Sac, Ca
‘17 GT F1A E85 Monster ‘16 C63s
Mine does the same thing on the very first start when I get back every other week for work. After that initial startup it functions normally which is odd, but whatever
Junior Member
Joined: Oct 2014
Posts: 67
Likes: 15
From: New York
c63s
My individual mode uses Sport drivetrain setting and I noticed that the latest update caused an intermittent abrupt/hard downshift into 1st when coming to a gentle stop ... at first (pun intended). However, it "trained out" after a few hours of (mixed city/highway) driving and is now back to only downshifting to 1st when the car comes to a complete stop (i.e., as it did before the update). On the plus side, it seems that the transmission is now smoother in city traffic. From a short test in Race mode, that seems to be the same (i.e., still wonderful). Oh, mine is a 2016 C63 S, so has the 7-speed transmission.
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Member
Joined: Nov 2017
Posts: 197
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From: SURREY, UK
W212E63s[rwd sold]W211E63[sold] 645ci [sold]2018 C63s Estate[sold], 2017 gla 45 [Sold] E46m3 [sold]
only recently have I not been driving my 18 c63s. indeed when left on the drive for a week or so, when I first start it up, it goes into a sulk and doesnt idle at the cold start revs of approx 1.2k, it does around 0.7k or so. poor car, I feel guilty walking past it every day and not driving it 
seems like it is engineered to do that for one or more reasons ... I call it sulk start.. note not to be confused with the facelift "emotion start"
seems like it is engineered to do that for one or more reasons ... I call it sulk start.. note not to be confused with the facelift "emotion start"
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Thread Starter
Member
Joined: Mar 2010
Posts: 106
Likes: 20
2021 GLE63S
What would the battery have to do with it?
The car cranks just fine with plenty of juice.
It's just the cold start that no longer is enabled after a few days.
Turn it off immediately, and then start it again and cold start then is enabled.
The car cranks just fine with plenty of juice.
It's just the cold start that no longer is enabled after a few days.
Turn it off immediately, and then start it again and cold start then is enabled.
Member
Joined: Apr 2018
Posts: 75
Likes: 6
2018 C63 Cabriolet
Search the forum, it's been covered before. Battery and lost Ecu time data is a possible cause.
