Engine is making a clicking sound, when I remove oil cap I can see one valve is not moving with engine running

That noise could be coming from your PCV valve. It will make a rattling noise when it is working properly. When you remove the filler cap.you allow air to enter the engine so much that the valve won't work properly.

dont know if engine is blown but when was last time oil was changed -your ticking or diesel noise are probably the valves [oil starved or damaged ] check oil level and also their are 2 sensors that relies on oil and are mounted next to the power steering pump one is the camshaft position which is inline with the oil cap and the other is camshaft position actuator solenoid if clogged or oil starved causes engine to run erratic and sometimes gives a trouble code not always to check your valves and engine cylinders will need to pull and check plugs --compression test and possible may have to pull valve covers to look at the head ---

oil bubbles ? oil splashes under valve covers across the valve train opening the valve cap may get oil splash-- but oil bubbles oil may foam a bit from being old or if coolant got in it and wouldnt bubble out of cap but bubbles --- and oil splash is normal when opening oil cap with vehicle running

this is normal, engine has PCV valve which pulls vapors from engine when running, by removing oil filler cap you are increasing air to PCV valve, the engine runs slightly lean with cap removed

Oil pump, or blocked oil lines. The clicking is the valve lifters not getting oil. You might try running some Sea Foam in it, follow the instructions carefully.

Remove oil pan and pump is bolted to back main bearing cap. But this is most likely not the problem. This engine is known for cam bearings spinning out of the block and cam shaft breaking inbetween #3 and 4 cam journals, oil pump is driven off the end of camshaft, engine runs very rough and makes all kinds of noise when this happens, cure is a new engine. to check for broken cam shaft removed front valve cover, have some one start or crank the engine, the 2 rocker arms on the drivers side will not move at all, most likely there will be silver metal dust laying in the low spots of the head where oil puddles up.

First you have to be able to slide a pan under the engine to catch the oil, Then remove the drain plug. Let all the oil drsin out while you cjange the oil filter by unscrewing it counterclockwise. Put oil on the new filter seal and screw the new filter on as snug as you can by hand.. Put the oill pand plug back in and snug it down. Don't forget the gasket washer under the plug. Slide the pan of old oil out carefully and set it where you won't step in it. Open the hood and on one of the valve covers ia a cap about 3" in diameter. Remove the cap and look inside. If yo can see the rocker arms that is it. Put 4 quarts of new oil in it, then start it. Look underneath for any leaks. Turn the engine off and ck the oil level with the dipstick. If it is a quart low, add the fith quart. If on the full line. Add no more. Only run the engine long enough to fill the oil filter . It should only take 10 seconds. If this is a v8, it should need the fiftj quart. Put the valve cover cap back on , Put he dipsatick back in, Close the hood, and deny forgetting about the pan of oil as you step in it as you move back proud of your first oil change. Always run the engine again for 5 minutes to make sure no leaks appear. Good Luck.

Read my other posts to the same problem. if the noise goes away with the oil filler cap removed you need to replace the oil filter housing and hose. good luk

sounds like an Idle air control valve or a positive crankcase ventalation valve(or pcv valve). use some intake cleaner in the air intake and take the pcv valve out and shake it it should rattle and move freely. mike

Make sure the pcv valve is working correctly and allowing the engine to breath