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1999 chevy s10 2.2L. I'm having a crank but no start symptom…

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1999 chevy s10 2.2L...
1999 chevy s10 2.2L . I'm having a crank but no start symptom on this vehicle. I checked for fuel pressure, fuel injector pulse, good spark on each spark plug, timing chain is good, no codes found and check compression although the compression is a little low about 80psi on all 4cil. I'm asking you my friend cuz I saw you helping a customer for the same problem or really similar issue. I only have the camshaft left to check, ignition module, and pcm and I know is rare to see this three.
Submitted: 11 months ago.Category: Car
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Answered in 1 hour by:
8/1/2017
Auto Mechanic: Jaybird61, ASE Certified Master Technician replied 11 months ago
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Car
Satisfied Customers: 2,312
Experience: Automotive Instructor at Palm Beach State College
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Hi, My name is Jay

The engine compression should not be below 100 psi in any one cylinder and all 4 cylinders should not have any one cylinder less than 70% of the highest cylinder. No cylinder should be lower than 100 psi. You will need to do a wet compression test to each cylinder by squirting or pouring a small amount of motor oil in the cylinder and recheck pressure to see if it goes above 100 psi. If it does then a piston ring is at fault. If it does not come up then one of the valves is still open. You either have cam timing out of position or bad leaking valves.

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Auto Mechanic: Jaybird61, ASE Certified Master Technician replied 11 months ago

"I hope that helps! My goal is your satisfaction today. If you feel I've been professional and helpful, your 5-star rating at this time is most appreciated. However, if you still need my help, you can hold off on the rating for now and reply back here -- I'll respond as soon as possible! Thank you"

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Customer reply replied 11 months ago
I'm just cranking the engine but it will not start, what I'm a little confused is that all 4 4cil have more less 80psi, is hard to think that all 4 rings are bad?? I will do the wet compression test first of all. I will see if the timing chain marks are correct.
Auto Mechanic: Jaybird61, ASE Certified Master Technician replied 11 months ago
A wet test checks rings only if it increases with oil in them otherwise it's timing.
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