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      10-28-2016, 07:45 AM   #1
lofrese1
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N63tu JB4 tune in cold weather problems!

Hi guys, the past fews days when I start the X5 it feels like it is misfiring for the first 10seconds then it stops and idles fine. Also when I'm driving for the first 10-15 mins when I go to accelerate there is big hesitation then the car jerks a little then takes off. This is my first year in the cold running the JB4 tune and it has been unusually cold for this time of the year here in New York it's been in the 40's in the morning and nights. But after the car warms up it drives fine. I was wondering if any of you guys experienced these symptoms running the JB4 tune in cold weather? Thanks.
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      10-28-2016, 02:53 PM   #2
Kzang
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If anything Cold air would help the engine more.. Never heard of this issue from anyone else.
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      10-29-2016, 08:26 AM   #3
onfireX5
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Mine did that too. No big issue. You start up in open loop and can be a little lean (stumble ) before it switches to closed loop. As soon as it switches it will be smooth again.
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      10-29-2016, 08:42 AM   #4
lofrese1
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Quote:
Originally Posted by onfireX5 View Post
Mine did that too. No big issue. You start up in open loop and can be a little lean (stumble ) before it switches to closed loop. As soon as it switches it will be smooth again.
Thanks for getting back to me. I was hoping it wasn't something like that and nothing major. Cause my previous vehicle was a F10 550i with the problematic N63 motor. Which gave me the same symptoms with start-up. I was hoping it wasn't something along those lines again!
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