Burnt Valve 96 SSEi
The other day i seem to have burnt a valve. #3 cylinder has 5 psi and all the rest have about 140 psi. Very ruff running and idling. The boost gauge is also wandering from about -3 to -8 as it idles. Two days before this happened i put a new cat on the car and the o2 sensor looked very light in color ( lean ). The scanner also confirmed that. My question is what can cause the lean condition, i plan on fixing the valves but i dont want to burn up another valve. Any help would be appreciated.....