SBC Issue

[ftpiercecracker1]

Since this is not a Comanche specific problem i decided to put this in the pub.

 

As some of you may know, i have an 82 J10 Gladiator.

 

 

 

This is the actual truck, albeit she is not in nearly as good of shape now.

 

 

Chevy 350/Turbo 400/Dana 300, pretty basic. She has been sitting for several years with minimal attention. Once or twice a year we would start and drive her around the block, but now that i am back in FL where she has been kept i am able give her the attention she deserves.

 

She has a new Carter fuel pump and a new Edlebrock 650, Electric choke, 4 barrel carb. Both have been bought a year or two ago now, but should only have a few dozen hrs on them.

 

 

The Problem:

 

The problem is after the engine has run for about 10-15 minutes it will start to run rough at lower rpms and at idle. If you raise the rpms up just a little it picks back up and runs quite smooth. After you have raised the rpms, if you drop the hammer the truck responds very well and will take off like a rocket, BUT once you let of the gas again it will really start to stumble and will even die completely. Starting the truck back up after it dies can be a bit of a challenge. You have to pump the pedal to get it to start and a lot of the time you have to stay in the gas to keep it running.

 

 

 

I have flushed the fuel tank with premium, replaced all the fuel filters, poured Sea Foam into the crank case, brake booster vac line (engine running) and fuel tank. I have also sprayed  a generous amount of carb cleaner directly into the carb with the engine running all in the hopes of cleaning out whatever gunk might have built up during its hibernation.

 

 

I am fairly certain the choke is disengaging because during a cold start the rpms are slightly elevated, then after a minute or two if i pump the pedal slightly the rpms drop dramatically to a more normal idle.

 

 

So, what are your ideas?

 

 

 

 

 

 

[HOrnbrod]

Clogged passage(s) in the idle circuit, maybe the jet itself. I'd tear it down to parade rest and throw a kit in it since it's been sitting so long.

[ftpiercecracker1]

10 4, i have been thinking the same thing, but put it off hoping my tune-up-in-a-can would solve it. Off comes the carb. :wrench: 

[JeepsOLot]

Nice J10! I'm not far from you, down in Stuart. I'm in a Jeep club, and there's always someone that can help with whatever you need. Should come down and meet up with us!

 

Jerry

[ftpiercecracker1]

I appreciate the invitation very much. Its a very rare occasion that i venture down to Stuart, but i may make an exception once i get the truck road worthy again . . . . . . . which will be a while.