Since the timing belt was off, suspect bent valves causing the loss of compression. Thank you for providing good information. The next place to turn is a cylinder leakage test. That involves putting each cylinder, one at a time, on top dead center on the compression stroke, then applying regulated compressed air through the tester into the spark plug hole. The tester will indicate the percent of leakage, and you can listen for where the leakage is occurring:
1. Tail pipe - bent exhaust valve.
2. Air intake / throttle body - bent intake valve
3. Oil fill cap - worn piston rings.
4. Bubbles in radiator or reservoir - leaking head gasket or cracked head.
If you didn't replace the timing belt, consider doing so. It jumped for a reason, usually because a few teeth are missing.
Saturday, March 13th, 2010 AT 6:08 PM