2005 Volvo S80 B5254T with 186,000 miles. I have 0 compression in cylinder 4
What is your question?
The remaining cylinders are all about the same and the compression is reasonable for the miles (155 PSI not warmed up) I know I have a valve problem or piston issue. Problem is the head needs to come off to resolve. Even if it is the valve problem lesser of the 2 issues. I'm leaning toward changing the engine out for one with lower miles. I have had 0 issues with this car since I bought it in 07 with 15K miles. The car is still in good shape everything works. I normally do everything myself timing belts/brakes/tunes ups/PCV system. I feel like I can change the engine myself but I'm curious what it would cost me to have someone else do it?
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You may have a stuck, burned or crusted Valve seat. Unfortunately you may have to pull the cylinder head.. Try putting a squirt of transmission fluid into the spark plug hole but not too much, reinstall the spark plug. Start and run it. It will smoke like hell for a little. Run at high rpm for a minute. May help bust any crud off the valve. If it does not run smooth or better then the head has to come off. You can also contact eerie vovo they have good used engines with warranties they can send you. Good luck
