Perform a cylinder leak down test of number five. What it does is apply air to number five cylinder when it is up at TDC when both valves are supposed to be closed and check for a leak. If you can hear air coming out the tailpipe then the exhaust valve is not seating. If air is heard back out the intake manifold or throttle opening, then the intake valve is not seating. If air is heard when you remove the engine oil fill cap or dipstick, then the piston rings are leaking or a blown head gasket, and if air bubbles are coming up in the radiator when you remove the radiator cap, then a blown head gasket.
As far as the others go, you never mentioned the readings but if you squirt a little motor oil into the cylinder and it goes up more then the piston rings are worn.
Monday, May 14th, 2018 AT 8:50 AM
