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03-06-2026, 08:03 PM
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#1 |
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Senior Member
 
Join Date: Jan 2025
Location: Arizona in a van down by the river
Posts: 618
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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.
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1972 C10 Custom Deluxe Highlander 402 Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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03-06-2026, 08:38 PM
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#2 |
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Registered User
Join Date: Nov 2022
Location: Seattle, WA
Posts: 605
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Re: My truck starts up much better using this one simple trick
what's your step/step adjustment instructions?
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'72 C10 Cheyenne SWB North Carolina kept for 50 years, 75k original miles, Medium/Hawaiian Blue paint, 3 owners - one for 40 years & garaged kept. Original: sheetmetal, undercarriage, moldings, glass, immaculate unrestored bed. * * * New - rebuilt engine at 65k in 2015, one frame-on respray in 2010, front bumper, blue houndstooth seat, carpet, 8 inch rally wheels on 275-60R-15, LED lighting. - Semper Paratus! |
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03-06-2026, 08:58 PM
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#3 | |
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Senior Member
Join Date: Jan 2025
Location: Arizona in a van down by the river
Posts: 618
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Re: My truck starts up much better using this one simple trick
Quote:
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.
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1972 C10 Custom Deluxe Highlander 402 Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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03-07-2026, 01:05 PM
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#4 |
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Registered User
Join Date: Jun 2000
Location: Spearfish, SD
Posts: 4,331
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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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Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club. |
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