Hi all,
Was hoping to get some guidance. Some details on the truck:
- 1986 Chevy K10 - 305
- Stock Rochester Carb (Rebuilt last year) - Electric Choke
Issue: Within last couple of weeks, I have had this issue where the truck goes to high idle randomly while driving. Now, it will only stay on high idle, basically the choke is engaged. The primaries on the carb spring back to being partially closed as soon as you hit the throttle. I can get them to be mostly opened by pressing down on the cam that is by the choke but as soon as I hit throttle, the cam goes back up and the primaries close. A few things I have done to troubleshoot:
- Validated that the wires to the electric choke are giving 12 v., I believe this is correct
- Pulled off the throttle cable as I thought this might have been an issue and pulled throttle linkage on carb back and will still go into high idle when I press the linkage to give throttle. Believe that eliminates the throttle cable being an issue
- I adjusted the choke plate (think that is what it is called), loosen three screws and then adjusted it (rotated forward) to where the cam for the choke is hitting the bottom point which now has the primaries fully open all the time, the choke basically is not in play.
I think with the troubleshooting done so far this is maybe pointing to the spring in the choke going bad? Is there anything else I should be looking at before I take the choke off? Anyone know of a good place to source for the spring?
Also, the idle speed was really high when the choke was engaged, the RPMs were about 2000k, I adjusted the fast idle screw on the choke to get the idle down to about 1200-1400 RPM, is that about right for the fast idle?
Thanks all!
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