'15 S550 Rough Idle, but ONLY at Operating Temperature. ANY IDEAS?
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Joined: Oct 2010
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From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
'15 S550 Rough Idle, but ONLY at Operating Temperature. ANY IDEAS?
I have a new, 2015 S550, with 2K miles. Once it reaches 200 degrees on the digital temperature gauge (which seems to be the standard operating temp) it gives me an intermittent rough idle as I sit at a light. It will sometimes shudder the car and sometimes surge a bit, but never enough to move the tach needle. I feel it in the steering wheel and also in the brake pedal. My wife can feel it in the passenger seat. I have taken it to two dealers who have both pronounced that "everything checks out fine!"
Upon start up in the morning, it is very smooth, until the temp gets to 200.
Any thoughts? I've opened a case with MB Customer Care, but I would sure like to have some intelligent suggestions to give them and any constructive advice would be most appreciated. If one more "tech" hooks it up to a computer and tells me that "everything checks out fine," I think I'm going to scream!
Upon start up in the morning, it is very smooth, until the temp gets to 200.
Any thoughts? I've opened a case with MB Customer Care, but I would sure like to have some intelligent suggestions to give them and any constructive advice would be most appreciated. If one more "tech" hooks it up to a computer and tells me that "everything checks out fine," I think I'm going to scream!
