mr_woodster Active Member Jul 28, 2003 1,314 0 36 Riverside, CA Dec 7, 2004 #2 Dec 7, 2004 #2 usualy crappy compression, do a leak down.
8 86GTRag New Member Dec 3, 2003 3 0 0 Dec 7, 2004 #3 Dec 7, 2004 #3 Hook a vacuum gauge up. If you have a bad valve the needle will vibrate slowly back and forth at idle. Then hold the engine at 2000 or so RPM. It will still vibrate but more rapidly with a bad valve.
Hook a vacuum gauge up. If you have a bad valve the needle will vibrate slowly back and forth at idle. Then hold the engine at 2000 or so RPM. It will still vibrate but more rapidly with a bad valve.