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 MANUALSCHEVROLET1985NOVA/CHEVY II L4-1600CC 4ALC NUMMIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSADJUSTMENTSFAST IDLE SPEED
1985 Chevrolet Nova/Chevy II L4-1600cc 4ALC Nummi
Fast Idle Speed
1985 Chevrolet Nova/Chevy II L4-1600cc 4ALC NummiSECTION Fast Idle Speed
Refer to Tune Up Specifications chart for curb and fast idle speeds. Check and, if necessary, adjust engine idle speeds every 30,000 miles.
Nova Models
1. Remove air cleaner.
2. Plug hot idle compensator hose to prevent rough idling.
3. Disconnect and plug hose from thermal vacuum switch valve M port. This will shut off the choke opener and EGR systems.
4. While holding throttle slightly open, push choke valve closed and hold it closed as you release the throttle.
5. Start engine but do not depress the accelerator pedal.
6. Set fast idle speed to specification by turning the fast idle adjusting screw.
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.