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-   -   My truck starts up much better using this one simple trick (https://67-72chevytrucks.com/vboard/showthread.php?t=863040)

IT Cowboy 03-06-2026 08:03 PM

My truck starts up much better using this one simple trick
 
Ok, not a trick and not clickbait either, but I adjusted my fast idle this evening on my divorced choke Rochester carb. It now starts up at 1100 rpm and then settles down to @750 with the first blip of the throttle.

Casper42 03-06-2026 08:38 PM

Re: My truck starts up much better using this one simple trick
 
what's your step/step adjustment instructions?

IT Cowboy 03-06-2026 08:58 PM

Re: My truck starts up much better using this one simple trick
 
Quote:

Originally Posted by Casper42 (Post 9425374)
what's your step/step adjustment instructions?

No real challenge and it was easy.

1. With the truck cold I stepped on the throttle once to engage the choke
2. With the air filter off I started the truck
3. I turned the fast idle screw clockwise. It is under the divorced choke on the
passenger side front
4. Once the truck was idling at 1100 like I wanted I let it warm up a few
minutes
5. When I blipped the throttle it release the choke cam and the idle went to
normal idle speed
6. I then adjusted the idle solenoid to the park idle rpms (700-750)

Before I did this my startup rpm was about 600 and I needed to keep it throttled up a bit until it warmed up. My idle speed was also too high then once it did warm up. I am thinking some of my throttle response issues might be related because the throttle was already open past the idle circuit at 900 idle rpms.

toms68cst 03-07-2026 01:05 PM

Re: My truck starts up much better using this one simple trick
 
I need to adjust mine too. I'll give it a try.


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