I went overseas for vacation and left my car in the garage. When i came back the battery was dead and jump start it. it would crank but no start. I know i had really worn plugs before i left so i replaced them and gave it a start. It started up smoothly up to 3000 rpm and died smoothly. No clunking noise, no banging, no sound of anything being blown. I had fuel, spark but no compression. I did compression test and weird thing is all 4 cylinders has ZERO compression. I asked older techs and had to advice of adding little oil to cylinder and test again. still ZERO compression. I took the valve cover off and nothing was damaged. Checked timing and the timing belt felt slightly loose. Replaced the belt and tensioner. Got everything timed and tested again. Still ZERO compression all 4 cylinder... i feel air coming from the cylinders really noticeably but gauge shows no compression. I went out bought a new gauge to make sure my old gauge wasn't broken, Same thing... now i am fairly lost on why am i getting no compression. Injector seal is good. When i did leak down test at TDC. It was showing 30% leakage average all 4 cylinders... any advice? when i did cylinder leak down test i felt air in the neighboring spark plug holes...i have a gut feeling that it could be a blown head gasket between the cylinders but that's that hefty job. I don't see how the gasket would be blown all of the sudden...

 

was cam timing spot on before you took the belt off? did it slip a few teeth sending some valves into pistons.

 

the timing did jumped 1-2 tooth now after consulting the technical...im assuming its the valved...i did leak down on all 4 cylinder on tdc and getting air coming out the intake manifold with throttle open and could hear air coming out the tailpipe

 

2 teeth could be 6 degrees. Sorry man.

 

with bent valves in all cylinder, wouldn't there be a lot of abnormal noise? i got everything put back..the engine is cranking normally with no abnormal sound but just no start and no compression

 

When you went on vacation did you take the car keys with you?

 

Unfortunately that thought crossed my mind too.

 

You kept the crank timing mark at TDC when testing all the cylinders? If not, disregard. If so, test it again with each cylinder you're testing on the compression stroke, right before TDC.

 

My first guess is that someone drove your car while you were on vacation. Otherwise, I've never heard of the issue you are having arising from out of nothing.

 

If the vavles hit the piston enough to bend themselve there will be marks on the piston. Could you borrow a camera from your local autopart store?

 

Have somebody else do the compression test.

 

if it started up and ran, you had compression.

 

That is mechanically impossible. Do you have siblings or friends you think might have taken it for a joy ride?

 

Did u figure out what the problem was? This story got me interested.

 

subscribed for results...interesting...