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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.
That is lifter noise, they probably need adjusting
Collapsed hydraulic valve lifter? Rocker arm (valves) need adjusting?
There could be a humming noise from the engine of a 2002 Toyota Corolla because of low oil or a fouled spark plug. It can also indicate a more serious problem.
It could be a sticking hydraulic lifter or valves that are slightly out of adjustment.
Check the heat shield on the catalytic converter
A clicking noise in the engine of a 91 Ranger could indicate a problem with the valves. A valve lifter in the engine may be worn or stuck.
Saturn vue V6 lifter noise when first started
you cant if rattling noise occures its a worn lifter very common on 3.1 motors
A ticking or clicking sound is probably lifter noise, the valves need adjusting
Hydraulic lifters are nonadjustable. Chances are the noise is coming from play in rocker arm, or ignition out of time. If you are sure it is the lifter, then it must be replaced.
1998 model year corolla has a timing chain and does not need to be changed unless it is making noise or is broken