Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985C 30 P/U 2WD V6-262 4.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSADJUSTMENTSFAST IDLE SPEED
1985 Chevrolet C 30 P/U 2WD V6-262 4.3L
Fast Idle Speed
1985 Chevrolet C 30 P/U 2WD V6-262 4.3LSECTION Fast Idle Speed
Check and, if necessary, adjust ignition timing before adjusting fast idle speed. Make all adjustments with engine at normal operating temperature, choke fully open, air cleaner installed and A/C control off, if equipped.
1. Disconnect and plug vacuum hoses as directed on vehicle emission label.
2. Position fast idle screw on high step of fast idle cam, then start engine.
3. Turn fast idle screw in or out and adjust fast idle speed to specifications.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.