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07-03-2020, 06:30 PM | #1 |
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About to give up and sell the car cause of the idle.
Have been battling this cold start idle issue just like many others here. Bounces from zero to 1 and sometimes almost sounds like its gonna die. I tried posting a video on here but it doesnt like iphones i guess. So far, i have replaced the icv, spark plugs, fuel breather valve. I am at the point where i am considering selling and buying another m3. Before i do, anything else you think i should attempt 1 last time? Thanks for the help. 👍🏼
Last edited by Integfoo; 07-03-2020 at 06:36 PM.. |
07-03-2020, 06:48 PM | #2 | |
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Do you have a tune? Battery / alternator? Throttle actuators? TAs would stall my car when they got degraded to a point of needing replacement. |
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07-03-2020, 07:10 PM | #3 | |
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I have no tune, battery is new but not sure how the alternator would cause a bouncy idle? I was going to replace the throttle actuators too but didnt after reading on the forums and their symptoms were different than mine (i.e. always throwing codes and going into limp mode). Mine shows no codes and never has gone into limp mode. |
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07-03-2020, 07:16 PM | #4 |
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Drives: 2023 G81 M3 Touring
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Mine’s done this for most of the two years I’ve owned it, definitely worse in the colder months. Occasionally it will stall, but most of the time it’s just stumbly for 10-15 seconds.
Holding my foot lightly on the accelerator helps, but it still dances about before settling. I want to get it sorted, but just haven’t been bothered enough. Next service I’ll get it investigated. |
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07-03-2020, 08:46 PM | #6 |
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07-03-2020, 08:47 PM | #7 | |
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07-03-2020, 09:15 PM | #8 |
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07-03-2020, 10:33 PM | #10 |
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There is only one sensor on the s65. It is the low pressure sensor that is easily accessible right behind the airbox.
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07-05-2020, 08:03 AM | #12 |
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You will find that there are 2 different looking sensors, one brass like the original, and a silver one. The brass one is discontinued, and is superceded by the newer silver one. the newer one uses a small adapter that you put on it before screwing it in place. They both go in the same location and do the same thing. You can still find the brass one if you dig around. I changed mine a year ago and used the brass one. It's a pretty simple fix with the right flex head wrench. I didn't have to remove the airbox though most people do. Took 10 minutes to swap it.
I hope that changing it will get your issue resolved. I never had any drivability issues, just a code that would pop up on long drives. Never had the code again after I swapped it out. https://www.ebay.com/itm/151734140904
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07-06-2020, 06:07 AM | #13 | |
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07-06-2020, 10:17 PM | #15 |
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07-30-2020, 02:04 AM | #19 |
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Sounds like you have a leak or a bad sensor. I would check the fuel pressure sensor. Happened to a buddy of mine.
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