what does the sound sound like? A whistling a clunking a cherping, a banging, or a squealing. And what part of the lower motor, driver or passenger, and hopefully one of your lower bearing are not going on you.
What makes you think it's valve noise? How's your oil pressure? If you only have a light, does it flicker or just plain turn on when the engine is hot and idling? If it's an oil pressure gauge, is the oil pressure down near the bottom during idle? If you have poor oil pressure and the engine is making a tapping noise when you accelerate hard, it
The air movement that creates the negative pressure (vacuum) is being redirected to the intake manifold to serve engine acceleration - making the vacuum drop.
if is a fast(constant) ticking sound which increases in speed as you accelerate then that sound most likely will be your lifters. they're not getting proper lubrication.perhaps you should either check and make sure your oil is not low and or concider using a thicker oil. 10/40.
Clutch throw out bearing bad.
When does it make a tapping noise? When your !) braking and turning wheel B) braking c) engine idling D) starting engine E) turning. I mean it just all depends....
Bring to a shop and have it scanned to determine problem
It sounds very much lke you have a leaking vacuum hose. Either it has deteriorated and needs replacing or it has come off its fitting. Carefully check the engine compartment in an effort to locate the source of the hissing sound. When you do repair or replace the hose you will probably cure the source of your idling (and hihssing) problem(s).
You could have a broken ring in one of your pistons. The broken ring can allow coolant to pass into your oil.. This will cause the engine to make noise and overheat.
IT is your CV Joints which is making this noise.
most likely reason for any vehicle to perform under its natural ability when cold is simple. cold engine= thick oil + more friction + less horsepower. until an engine has reached its optimum temperature and oil is warm and not thick anymore, there will be alot more friction inside the engine making it harder for the car to run.
My 2003 Chevrolet Suburban 280 hp engine is making metal clicking sounds when I accelerate. It gets worse the faster I go. The battery went dead and had to be jumped two days ago. The car starts fine but then it makes this clicking sound when I put it in drive and go. It happens in park also. What is this?
Probably belts. Does it come from the engine compartment? Does it go away when you accelerate, or does it just get worse?