Hey guys. Got a customers car here and were stumped. Figured you guys might be able to figure it out if you've ran across this before.
103k miles
0 psi compression. 30psi on cyl 4. Cranks fast like the plugs are out. Wet and dry test yield the same results. All 4 pistons are moving. Valvetrain is moving and timing marks all lined up. Set cyls at tdc and pressurized with shop air. No drop in pressure from the shop tank. No air coming from intake, exhaust, coolant or oil dipstick....
So it seems the cyls are holding pressure but no compression during cranking....scratching my head.
Thanks
103k miles
0 psi compression. 30psi on cyl 4. Cranks fast like the plugs are out. Wet and dry test yield the same results. All 4 pistons are moving. Valvetrain is moving and timing marks all lined up. Set cyls at tdc and pressurized with shop air. No drop in pressure from the shop tank. No air coming from intake, exhaust, coolant or oil dipstick....
So it seems the cyls are holding pressure but no compression during cranking....scratching my head.
Thanks