dead cylinders
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New User
Joined: May 2011
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dead cylinders
I've got a 81' E350 motorhome about 75000 miles 460 . # 3,4,7 cylinders seem to be dead . Pull the sparkplug wire off and no change to the motor . I've had the carb rebuilt ,new cap ,rotor, plugs, plug wires . Compression in each cyl. is about 125 psi. I've even tried a new /used duraspark module .Anybody got any ideas ?
Elder User
Joined: Nov 2004
Posts: 666
Likes: 5
Pull the valve covers and look for bent pushrods and broken rocker studs.
If you have 125 psi on all cylinders, then you are not looking at burnt/bent valves or blown head gaskets. You've ruled out spark plugs, plug wires, and cap. Look for a mechanical problem. Since you get good compression readings, most likely bent/broken parts on exhaust side rather than intake.
If you have 125 psi on all cylinders, then you are not looking at burnt/bent valves or blown head gaskets. You've ruled out spark plugs, plug wires, and cap. Look for a mechanical problem. Since you get good compression readings, most likely bent/broken parts on exhaust side rather than intake.
