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 MANUALSCHEVROLET1986C 20 P/U 2WD L6-292 4.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSADJUSTMENTSFAST IDLE SPEED
1986 Chevrolet C 20 P/U 2WD L6-292 4.8L
Fast Idle Speed
1986 Chevrolet C 20 P/U 2WD L6-292 4.8LSECTION Fast Idle Speed
6-292 ENGINE W/1ME, 1MEF CARBURETORS
Check and, if necessary, adjust ignition timing before adjusting fast idle speed. Make 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. Place transmission in Park or Neutral, then adjust curb idle speed as previously outlined.
3. Position cam follower tang on high step of fast idle cam. On manual choke models with smooth cam surface, rotate cam clockwise to its fully upward position.
4. Support lever with suitable pliers, then bend tang in or out to obtain specified fast idle speed.
RENDER: 1.0x
NO RELATED
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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.