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Lost compression on all four cylinders

(1992 Toyota Tercel)
in Lake City, FL on March 11, 2010
lost compression on all four cylinders ...timing is on ...car was running great then poof nothing...yes the belt is still on and not broken..like i said the timing is on the cam is not worn or broken..this has me confused....never seen a car lose all four @ once and it not be the timing belt nor cam
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Popular Answer
on March 11, 2010
Check the vavle adjustment and then check the head gasket. I had a customer blow out the rear of her head gasket on her Tercel all at once.
on June 16, 2011
I've had this problem before, The exhaust timing gear may have spun causing the pistons to crash into the exhaust valves. The problem was preceded by what sounded like valve clatter. all 8 valves ended up bent enough to not let them close. The timing chain will still look like its on the marks. The gear may even fall back into place. If you remove the gear you can see a groove where it spun. I noticed this after taking the valve cover off and seeing that none of the buckets over the springs were rising all the way up in comparison to the intake buckets,
on June 16, 2011
've had this problem before, The exhaust timing gear may have spun causing the pistons to crash into the exhaust valves. The problem was preceded by what sounded like valve clatter. all 8 valves ended up bent enough to not let them close. The timing chain will still look like its on the marks. The gear may even fall back into place. If you remove the gear you can see a groove where it spun. I noticed this after taking the valve cover off and seeing that none of the buckets over the springs were rising all the way up in comparison to the intake buckets,
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