Engine has 54K miles, not a racer, well maintained, just replaced the valve springs with the heavy duty ones, 100#. Engine ran fine for 20 minutes or so while I bled the brakes, then after I drove 5 miles and came to a stop I hear a rattle/knock. It's only at idle, goes away as soon as I build rpm. Does not do it until engine has warmed up, cold start no noise. Could it be carbon that has broke loose? If it were a bearing I would think it gets worse at RPM.
Thanks for any tips or ideas,
MT
Thanks for any tips or ideas,
MT