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Repairing stripped Idle Mixture screw hole in throttle body

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Reaper19:
Well, I had the car running almost smoothly for the last month or so after adjusting my rebuilt E4ME that a local carb builder completed. Today I was taking my 81 Corvette out for a ride and the next thing I know the idle jumped up to 1500 and running rough. After checking all connections for gas or vacuum leaks I found one of the idle mixture screws popped out of the throttle body. Come to find out it will not screw back in because it is stripped. I also found the secondaries did not close all the way everytime leaving about a 1/16 inch gap, which could explain some of my rough idle issues.

Anyone know how to repair a striped screw hole? Or will the throttle body need replacement.

Thanks

Ethan1:
 You could either find a used one or send it to Cliff. What carb # are we talking about? Maybe a Helicoil?

Reaper19:
It is a 17081228 carburetor. The base is 707225. It is for a 1981 corvette with the black M/C solenoid. Do you know the hole size and what Helicoil might work? Do you know of anyone who sells the Helicoils?

Thanks

Randy

Ethan1:

--- Quote from: Reaper19 on August 02, 2015, 04:31:54 PM ---It is a 17081228 carburetor. The base is 707225. It is for a 1981 corvette with the black M/C solenoid. Do you know the hole size and what Helicoil might work? Do you know of anyone who sells the Helicoils?

Thanks

Randy

--- End quote ---

 I cannot remember what thread pitch was used for the mixture screws on the later carbs. I know the 10-32 was widely used. Any vendor that sells helicoils, should be fine. Do you have a thread pitch gauge?

Reaper19:
Thanks for the replies. I do not have a thread pitch gauge, but probably can borrow one from my tranny mechanic. I decided to see if the carb builder would repair since I've had multiple issues with the carb since the rebuild. Took the carb back to the local carb builder who is looking it over. He mentioned possibly replacing the base with another one from the same model carb, so I'm waiting to see if he decides to repair or replace the base or come back and tell me he will not repair. He is determining why the idle screw would have been stripped, but after all the other issues with the rebuild and taking it back 7 times I am beginning to lose faith in their abilities on electric carbs. Wish I would have found this site first and just sent the carb to Cliff to rebuild in the first place.

I'll let you know how it turns out.

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