Rough Running Truck
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Joined: Apr 2002
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From: Goose Creek USA
Rough Running Truck
I have a 1985 F-150. It originally had a 302 with a 2 barrel carb. When the engine was rebuilt, the intake and carb were replaced with a 4 barrel set up. It ran fine for a long time. My dad has had the truck for the last year or so, and I recently got it back from him. The truck now runs very rough, and puts out black smoke from the exhaust. It would die at stops unless you kept your foot on the gas to keep it reved up.
I adjusted the idle adjustment screw and the electric choke. I actually diconnected the choke altogether for now. Once I get it running smoothly again, I might hook it back up. The truck now runs fairly smoothly, and no longer tries to die at stops, but it is still putting out a lot of black smoke.
I adjust the two mixture screws located on either side of the Holley carb. I found them only about a 1/16th of a turn open. No matter what I do, I can't seem to get rid of the smoke.
Is there anything else that could cause the smoke besides the mixture adjustment screws? I believe it is running really rich due to the smoke and the strong gasoline smell.
Any help is appreciated!
I adjusted the idle adjustment screw and the electric choke. I actually diconnected the choke altogether for now. Once I get it running smoothly again, I might hook it back up. The truck now runs fairly smoothly, and no longer tries to die at stops, but it is still putting out a lot of black smoke.
I adjust the two mixture screws located on either side of the Holley carb. I found them only about a 1/16th of a turn open. No matter what I do, I can't seem to get rid of the smoke.
Is there anything else that could cause the smoke besides the mixture adjustment screws? I believe it is running really rich due to the smoke and the strong gasoline smell.
Any help is appreciated!
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Joined: May 2004
Posts: 2,223
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From: Billings Montana
it sounds like the power valve to me. When you get a hole in that thing, it'll let gas seep into the carb and choke it out. You can get a lifetime replacement from any parts store for a few $$. Holleys are easy to work on and it might only take an hour or so to fix it. Let me know how it goes because I have to do the same thing to my F-250.
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Joined: Nov 2003
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From: Central Virginia
Originally Posted by navynuke04
The metering block is what the accelerator pump attaches to, right? It's held on by the four bolts on the front of the carb?
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From: Omaha, NE
Originally Posted by navynuke04
The metering block is what the accelerator pump attaches to, right? It's held on by the four bolts on the front of the carb?
the front fuel bowl, not the metering block.
Once the four bolts have been removed, the front fuel bowl will come
off. Then the metering block will need to come off, then you'll see the
power valve.
Scott