Quote:
Originally Posted by Lightningfastbmw
2011 BMW 535i. I as well have the P0171 code with several cylinder misfires. On a cold start my car sounds smooth. But when the engine has warmed up and I start the engine there is a extremely loud and high pitch noise that shows up. It rough idles with the rpm going up and down around 1000rpm. Feels like the car is reving itself. But when I rev the engine up to 3000 rpm the sound goes away and it idles smoothly. Anyone have any ideas?
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Have you ever gotten a DTM or CEL or ran any tools to check for faults? I would start there. Rough idle, bouncing idling and weird noises could be an abundance of things.
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2011 550i (N63)
Upgraded 51mm turbos, Heatsync Stage 3 Flash, JB4 stacked, BMS WMI, Arm Charge Pipes, Heatsync Catless DPs, X-Pipe, Res Muffler Delete, xHP Stage 3 Trans Flash, Turbosmart Diverter Valves, 3.5 TMAPs, Oil Cooler, Heatsync Front Mounted Max Cool Intakes, Walbro LPFP and e40 mix rollin on Stance SF07 9x20 w/Toyo Extensa and 10.5x20 w/Toyo R888R.