1. GENERAL INFORMATION People GT 300i Possible cause 9. Check oil level and condition Incorrect Oil level too high Oil level too low Contaminated oil Correct 10. Remove cylinder head cover Valve train not Clogged oil and inspect lubrication lubricated properly Clogged oil control orifice Valve train lubricated properly 11. Check for engine overheating Overheating Fan motor not working Excessive carbon build-up in combustion chamber Use of poor quality fuel Not overheating Wrong type of fuel Drive and driven pulleys/clutch slipping 12. Accelerate or run at high Engine knocks Worn piston and cylinder speed Worn type of fuel Excessive carbon build-up in combustion chamber Ignition timing to advanced (faulty ECU) Engine does not knock Lean fuel mixture 1-18