can you manually adjust the idol on the Rochester carb for a 350 small block?

crigglybits
20

Asked by crigglybits Nov 21, 2012 at 05:18 AM about the 1981 Chevrolet Corvette Coupe

Question type: Maintenance & Repair

My '81 has high idle speed and will not kick down. Choke light stays on dash.
1200-1800rpm range. Thank you.

6 Answers

Andrew Olsen
6,095

Its not the idle. You choke is sticking and keeping you at a fast idle. Yes you can adjust idle speed, but that will only act as a crutch to your problem. Repair or disable the choke.

2 out of 2 people think this is helpful.
tcxd40
215

No, do not disable the choke, you will have hard start problems and the air fuel ration will be out of sinc. These are the first computer control carbs for the Corvette. Either have it rebuilt by a shop that knows the style of carb or buy a new /rebuilt from any Corvette parts supplier like Corvette Central, Ecklers, etc.

2 out of 2 people think this is helpful.
Denis Sagendorf
365

YO TCXD40; HADN'T MANUFACTURERS STARTED THAT ADJUST & SEAL THE SET SCREWS BULL ABOUT THAT TIME??

1 out of 1 people think this is helpful.
tcxd40
215

Yes the mixture screws are covered in a steel cap that was cast into the base so to speak. Special tool required ti drill the area around the cap and remove so they can be adjusted.

3 out of 3 people think this is helpful.
crigglybits
20

Thx guys...all helpful hints...found that elect. choke was still ok, but insufficent voltage preventing activation. Sorted out the voltage issue and she now idles at 600rpm...nice work.

1 out of 1 people think this is helpful.
tcxd40
215

Glad to know she's running again....

1 out of 1 people think this is helpful.

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