Worn or sticking valve lifters may cause a clinking noise at low speed, specially when the engine is warming up, but you heard a taping noise and you are loosing oil too?
Let me help you to diagnose and locate that noise:
You need a stethoscope to amplify the noise.( Cost very little money)
start your car, open the oil filler cap and listen through the opening. This may give you an indication of clogged lifter or excessive valve clearances.
Listen at each intake and exhaust manifold runner, a valve that have excessive clearance or very worn guide will be detectable and isolated( DO NOT PLACE THE STETHOSCOPE ON THE VALVE COVER OR HEAD BOLT)
Listen at the fasteners holding the valve cover, noises that appear to have a frequency rate less than the speed of the crankshaft indicate a camshaft related problem this includes the valve drive train, mechanical fuel pump, oil pump and distributor.
If noises appear in this area, start checking your oil pump with a oil pressure gauge.
Noise occurring at the same rate as the crankshaft rotation can be caused by piston slap, loose piston pins, worn connecting rod bearings and worn main bearings.
Once the problem is isolated, it will be up to you to do the tear down or take it to a mechanic.
Good luck :)
Tuesday, January 2nd, 2007 AT 12:52 PM