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 MANUALSCHEVROLET1982CHEVETTE L4-111 1.8L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTUNE-UP AND ENGINE PERFORMANCE CHECKSIDLE SPEEDADJUSTMENTS
1982 Chevrolet Chevette L4-111 1.8L DSL
Idle Speed: Adjustments
1982 Chevrolet Chevette L4-111 1.8L DSLSECTION Adjustments
NOTE: Refer to Diesel Engine Performance Specifications chart for specified curb and fast idle speeds.
CURB IDLE SPEED ADJUST
1. Set parking brake, then block drive wheels.
2. Position transmission shift lever in Neutral, then connect suitable tachometer following tool manufacturer's instructions.
3. Start engine and allow to reach normal operating temperature.
4. Loosen idle speed adjusting screw locknut, then turn adjusting screw inward or outward until specified curb idle speed is obtained, Fig. 4.
5. Tighten locknut, stop engine and disconnect tachometer from engine.
FAST IDLE SPEED ADJUST
1. Set parking brake, then block drive wheels.
2. Position transmission shift lever in Neutral, then connect tachometer following tool manufacturer's instructions.
3. Start engine and allow to reach normal operating temperature.
4. Apply vacuum to fast idle actuator, then loosen fast idle adjusting screw locknut, Fig. 4.
5. Turn knurled adjusting nut inward or outward and set fast idle speed to specification.
6. Tighten locknut, stop engine and disconnect tachometer from engine.
CURB IDLE SPEED ADJUST
1. Set parking brake, then block drive wheels.
2. Position transmission shift lever in Neutral, then connect suitable tachometer following tool manufacturer's instructions.
Fig. 4 Curb & Fast Idle Speed Adjustments:
3. Start engine and allow to reach normal operating temperature.
4. Loosen idle speed adjusting screw locknut, then turn adjusting screw inward or outward until specified curb idle speed is obtained, Fig. 4.
5. Tighten locknut, stop engine and disconnect tachometer from engine.
FAST IDLE SPEED ADJUST
1. Set parking brake, then block drive wheels.
2. Position transmission shift lever in Neutral, then connect tachometer following tool manufacturer's instructions.
3. Start engine and allow to reach normal operating temperature.
4. Apply vacuum to fast idle actuator, then loosen fast idle adjusting screw locknut, Fig. 4.
5. Turn knurled adjusting nut inward or outward and set fast idle speed to specification.
6. Tighten locknut, stop engine and disconnect tachometer from engine.
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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.