My car has a random misfire its idling rough stalling and hesitating when pushing the pedal. When look at the engine i notice a hizzing and knocking sound at the right side of the engine but im not sure where exacly it is.
First - check engine light came on - then RPMs started accelerating while in park.... then it started making a tea kettle whistling noise...still under warranty. they replaced the pressure regulating valve?... that fixed it.
High pressure fuel pump mafunction and cam replacement due to cam wear on the lobe. Took it in due to engine light and had many trouble codes that went with it. Had to go to the dealer to get it diagnosed. Seems to be not an uncommon problem. Apparently this same cam problem is not uncommon in German cars. Bad metalurgy??? A cam wearing out at 120000 miles is ridiculous.
Engine was at highway speed 75 mph, lost power, engine light came on, engine quit, had to coast to side of road. Technician reported cam follower completely worn through, cam damaged, due to worn cam follower HPFP did not have full stroke for fuel delivery creating lean fuel situation which caused cylinder 3 and 4 to melt sparkplug electrodes and melting cylinder 4 piston. Engine completely ruined. Dealer had just done service at 101780 miles, 315 miles after service performed.
Check engine light came on, dealer said it had camshaft problems. Haven't been given a cost to fix it yet.