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Depends....a 2 valve per cylinder V8 would have 16 valves. A 4 valve per cylinder 4 banger would have 16 valves. There are also 3 valve per cylinder V8s...which would be 24. The number of valves does not necessarily determine what engine it is.
If the lifter has failed, the engine will run poorly due to no valve action on that cyl. Confirmation would be to remove the valve cover to see which valve is not working. You will have to remove the intake to get at the lifter, and if you do that, the might be good to replace them all, hopefully the cam is still good. It is possible that the cam is worn also.That can be replace at the same time thru the front of the engine when you strip it.
As far as I know you do not need to readjust the valve lash on the 2.5L 4 cylinder engine as a routine maintenance item. Of course if you do a valve job or replace lifters, push rods or such then you would have to readjust the valve lash.
A compression test would be the first test I would start with, If you have low psi readings in the suspect cylinder your valve could not be opening all the way. To replace them you first have to remove the valve cover then the rocker arm and the push rod, then you can take a telescoping magnet and pull out the lifter. Turn the engine to top dead center and mark the distributor where the rotor is pointing. Remove distributor, fuel lines, the intake manifold and related wiring. Now you can remove the retainer for the roller lifters and replace any bad lifters. Assembly is reversal of removal.
If your engine has a distributor cap then I would replace the cap and rotor with a FACTORY OEM. Cap and that should fix your problem. Now if you have the new stayle engine that don't have a distributor cap then I would replace the coil that is mounted on the top of the valve cover for the #6 cylinder.
Collapsed hydraulic valve lifter? Rocker arm (valves) need adjusting?
I just had mine fixed. I asked the mechanic where it was and he said behind the exhaust and the #4 cylinder. I don't know anything about cars but he showed me a hose that had collapsed because I needed to change the pcv valve. He said that is hard on an engine and he said I would get better gas mileage and oil useage because of changing it.
That cylinder is burning oil, from a bad valve, or worn rings, most likely.
You have to have an operation to replace a heart valve. They had to replace the burned out valve on the truck.
valve who needs ajustment
That would depend on which part of the system the RELIEF valve is located
There would be two valves per cylinder ! The data is in your question.