There is a tapping coming from the valve train

Sounds like some valve train problem. You mean it won't run at all, just sputters when cranking? Sounds like that could be one or more cylinders not firing because of valve train problem. If you took the valve cover off from the top of the engine, you could maybe see what is causing the tapping. Not that unusual for worn parts to fall out of place and not work the valves properly. If the valves don't work correctly, you won't get the engine started.
A '94 Probe...is that a beater needing a quick fix? Engine work can get very costly, so be careful.

LOUD tapping noise coming from valve train... ' Mustang Forums at ...

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Nov 16, 2010 - Last night on my way home from work something broke in my engine. I have a 98 GT. It sounds like it's coming from the top of the passenger ...

What the heck is this sound...?? Too loud for normal valve ...

? 0:11
https://www.youtube.com/watch?v=IMp1H8-0BSE
Aug 9, 2013 - Uploaded by team14robot
Freeing up a stuck valve without having to tear the engine down - Duration: 11:38. by dawino6260 47,255 ... 2005 scion tc enginetap/knock.

tapping noise is usually a problem in the head [valve train ] check oil level and oil pressure -tapping usually from oil starved ,worn or damaged -valve,rocker,push rod--also can check belt pulleys or alternator they can also cause a noise but the head area is the most common

I think you will ruin the engine with the thick stuff from the parts store
if you have variable cams-- your in big trouble with thick oil

I think you forget the noise & continue on


How would a timing belt cause noise in the valve train?


You had it apart some what ,see any reason the belt would
be an issue?


I think it is worn out ,try something that isn't Asian next time

If you hear the valves, usually they are worn out and/or not getting enough oil. They are self-adjusting so they are supposed to stay in place. The valve train is the last thing in the engine to get oil from the pump.

i may say is not from the valve train could be ticking sound if the valve has problem. tapping noise has when the head gasket leak develops.

Hi, This sound is the rocker gear or valve train in the engine, you will need to get these checked and gaps reset.
Hope this helps, Thanks
Jason

If the tapping noise speeds up with engine speed, a bad valve lifter.Depending on if it has hydraulic valve lifters.

How long has it been from oil change. Have you checked Oil pressure? If filter is old and dirty fluid needs to warm to be thin enough to get enough volume to valve train. If oil pump is getting weak it will not pump sufficient fluid to valves at low RPM. First change oil and filter. After that make sure pressure is in spec's.

The 6.0 engine had an issue with piston to bore clearances, from the factory these clearances were excessive. It is reffered to as "piston slap". This condition is known by GM, but most dealers say it's normal. It can be as slight as an annoying tick, to a clearly audible clacking noise. Unfortunately the condition was under played by GM, and there are many folks who haven't been able to get help with their trucks. I own an '03 Silverado w/6.0, and hear this noise everytime I start my truck. I deal with it, because I'm a mechanic and figure I'll be able to fix it if I need to. Research more online about this condition. I've found many websites that relate to this issue (Google: 6.0 piston slap) I hope this helps.