|
I used to have quite frequent pinging on my my11 manual m3, pretty much in any gear under load and under 3k rpm. I've had some success with Redline si1 fuel system cleaner - pinging greatly reduced after a few bottles.
The build up appeared to be caused by a faulty thermostat (stuck open, so car warming up too slowly) - after fixing that and running the cleaner the car pings less but it's not completely gone.
I'll be trying a couple more bottles on a long drive to see if I can get rid of it altogether.
|