Stumped
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Cross-Country
Joined: Sep 2008
Posts: 61
Likes: 1
Stumped
I've got an 81 F100 with a 300 6cyl. 29K Mi.
When I got the truck the smog pump was siezed, the belt was already off so I removed the pump. The truck ran just fine.
After a while, it started running rough again so I checked and then replaced the plugs & plug wires and a new dist cap & rotor bug. Ran ok for a while and then started running rough agian.
I've located a few vacume leaks and have plugged them. Also replaced the air filter.
Now I'm stumped. Truck still runs rough and won't idle.
What should I try for next?
When I got the truck the smog pump was siezed, the belt was already off so I removed the pump. The truck ran just fine.
After a while, it started running rough again so I checked and then replaced the plugs & plug wires and a new dist cap & rotor bug. Ran ok for a while and then started running rough agian.
I've located a few vacume leaks and have plugged them. Also replaced the air filter.
Now I'm stumped. Truck still runs rough and won't idle.
What should I try for next?
Fleet Mechanic
Joined: Aug 2009
Posts: 1,771
Likes: 9
From: Western Washington
I'd check your carb, my guess is it's gummed up bad, might be time to re-build it, or at-least give it a good cleaning. Fuel filters could be contributing to the issue as well.
Have you done a compression test? I'd do that before much else, it could alert you to any mechanical issues your motor may have.
Sam
Have you done a compression test? I'd do that before much else, it could alert you to any mechanical issues your motor may have.
Sam
Thread Starter
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Cross-Country
Joined: Sep 2008
Posts: 61
Likes: 1
I'm thinkin it might the carb. I've replaced the filter but the truck has sit for long periods at a time, so it might be gummed.
I also had new exhaust put on and the catalytic converter was removed.
Just trying to eliminate all other possibilities b/f I tear into the carb.
I also had new exhaust put on and the catalytic converter was removed.
Just trying to eliminate all other possibilities b/f I tear into the carb.
Laughing Gas
Joined: Nov 2011
Posts: 1,033
Likes: 11
From: Wausau, WI
Another thing would be to pull the carb apart and clean it as said before. It may have the famous ethanol "jelly" in it. If the truck sits for a while, that may also be a problem. Ask me how I know 
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