Mostly missing
Freshman User
Joined: Jun 2002
Posts: 28
Likes: 0
From: Mims, Fl.
Mostly missing
I have a '78 F-100 with a 302 that has a miss fifty percent of the time.I have the Duro-Spark which came with the truck. My coil was bad {Arking at the coil boot}. It was really bad before I replaced that. Sometimes it will stop missing on it's own and my speed will increase 5 mph right away. New plugs didn't help. Distributor looks good. Two questions..
1. Can I remove the plug wires at the distributor and test them rather then as the book say's "Remove the plug wires and hold them a quarter inch away from the ground to check your spark or can I check for a spark gap between the plug wire and the plug with an extended piece of metal between the boot and the plug?. I don't seem to have any luck by pulling a plug wire and listen to see If my miss gets worse. Seems like there is hardly a change when I pull any of the plug wires off.
2. Anyone have any secrets on different ways or short cuts to check out a rough running engine? The carb. was just recently rebuilt and I'm 99 percent the problem is electrical. More plug wires didn't help either.
1. Can I remove the plug wires at the distributor and test them rather then as the book say's "Remove the plug wires and hold them a quarter inch away from the ground to check your spark or can I check for a spark gap between the plug wire and the plug with an extended piece of metal between the boot and the plug?. I don't seem to have any luck by pulling a plug wire and listen to see If my miss gets worse. Seems like there is hardly a change when I pull any of the plug wires off.
2. Anyone have any secrets on different ways or short cuts to check out a rough running engine? The carb. was just recently rebuilt and I'm 99 percent the problem is electrical. More plug wires didn't help either.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Mostly missing
Go to your local autoparts store and pick up a spark tester. They are cheap. They plug into the plug end of the wire and clamp to the engine for a ground. This way you don't get shocked either.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Mostly missing
Start the engine in a really dark spot and while the engine is running ,look for a *light show* under the hood where the wires are shorting out(if they are).
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