Loss of cylinder #7

Guest

I picked up my car Saturday and the drive home all was fine. Took it out for a short
drive (over to a friends) later and on the way coming up to a stop light and slowing
I heard a pop and noticed the exhaust sounded different. The engine stalled and upon restart runs really rough. Initial finding
by shop is no compression in cylinder #7. Not sure what happened yet, as trying to work out with previous owner since I just bought the car and did not expect this type of promlem. Blown head gasket, bent valve, other? Any suggestions on how to proceed?
TIA.

11/7/002:31 AM

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Original Post

Bosswrench. (Guest)

Stock Fords have two-piece valves. The heads are friction-welded to the stems. With many millions of valves built,inevitably a few WILL fail statistically. Zero compression means there is metal missing somewhere in that cylinder. It is closed at the bottom by the piston & rings and at the top by the head & valves. The odds are it is a broken valve head, a keeper that unlatched and dropped the valve inside or a broken spring that allows a valve to stay open. Possibly a pushrod bent or broke, cocked the rocker and bent a valve open. Without driving further, pull the valve cover for that bank of cylinders & carefully look at all the valves. If this guess is correct, the head and block could be destroyed if you run the engine any more. FYI, this exact scenario happened to a Pantera owner with a newly bought, lo-mileage GT5-S 90 days ago in France. Let us know what really happened; good luck.

11/7/0011:57 AM

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