Sometimes putting a jug of Transmission Fluid in your oil will clean the junk out of your lifters and stop your noise - if it is an older vehicle with adjustable rockers you can adjust and get rid of the knock.
You can adjust tapping valves by adjusting the lifters.
I have a mitsubishi galant 2003 and the hydraulic lifters are tapping. It comes and goes. Should these be replaced? Have the lifters adjusted.
rislone
A "clacking" "tapping"sound
you might have to replace the lifters.
In most cases, you can tell that your lifters are bad, in your car engine, by the ticking noise. A bad lifter will make a tapping sound.
possibly low oil or low oil pressure, the tapping may be coming from the oil operated hydraulic lifters.
Lack of oil lubrication to the valve lifters.
Exhaust leaks, bent pushrod
Tapping valves is a noise made by too much clearance between the valve lifter and the valve. Modern engines have hydraulic lifters. If you have too little oil pressure or run the engine low on oil, the lifters will make noise. The lifter can also wear out.
bad lifters will rattle when engine is running at idle you will hear anything from clicking in engine to rapid tapping,depending on how bad and how many lifters are bad if vehicle has hydraulic lifters check for proper oil level in cngine
bad lifters will rattle when engine is running at idle you will hear anything from clicking in engine to rapid tapping,depending on how bad and how many lifters are bad if vehicle has hydraulic lifters check for proper oil level in cngine