Engine miss
Thread Starter
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Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
Engine miss
What am I missing? 84 302 Ford HO motor. Edelbrock intake with 500 cfm Edelbrock carb. HEI distributor. Motor has developed a dead miss on # 5 cylinder. Compression is 120 to 130 in all cylinders. Idle vacuum is 20 inches. Following the chart for vacuum gauge reading, there is no indication of any related problem areas. Once I isolated the cylinder by removing plug wires untill one had no effect, I installed an ingition test device that goes between plug and wire end cap. It was firing strong, so I replaced the plug, no change. Thinking I might have a cam problem I pulled the vc and found that both valves are opening and closing. I am just a hobbiest and have no training in diagnosing this stuff, have I overlooked something? Joe
Thread Starter
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Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
Thanks bashby, you are 100% correct. A local guy suggested I do the same and that proved to be the culprit. I had assumed that a leak there would cause low idle vacuum, but it did not. I do appreciate your input. Joe
