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 MANUALSCHEVROLET1979LUV RWD, AUTOMATIC TRANS, TRANS MFR CD 200CREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPTUNE-UP PROCEDURES - 4-CYLINDERIDLE SPEED & MIXTURE1979 MODELS
1979 Chevrolet Luv RWD, Automatic Trans, Trans Mfr CD 200C
1979 Models
1979 Chevrolet Luv RWD, Automatic Trans, Trans Mfr CD 200CSECTION 1979 Models
- Set idle with engine at normal operating temperature, valve clearance correctly set and ignition timing to specifications. Choke should be open, air conditioning off and air cleaner installed. Disconnect and plug vacuum lines for distributor, hot idle compensator, and EGR valve.
- Turn idle mixture adjusting screw all the way in, then back out 3 turns (Federal) or 1 1/2 turns (Calif.). Set throttle adjusting screw to obtain 900 RPM or 850 RPM (Federal vehicles with manual transmission).
- Reset idle mixture screw to obtain maximum RPM, then reset throttle adjusting screw to achieve same RPM as in step 2). Turn idle mixture screw clockwise (lean) until speed drops to 850 RPM or 800 RPM (Federal vehicles with manual transmission).
- On all models (except Federal vehicles with manual transmission), turn idle mixture screw counterclockwise (rich) 1/2 turn. Then, reset throttle adjusting screw to obtain specified idle speed.
- On A/C equipped vehicles, turn on A/C to maximum cooling and high blower. Open throttle far enough to allow idle speed-up solenoid to reach full travel. Then, turn speed-up controller adjusting screw to obtain 900 RPM.
1979 IDLE SPEED SPECIFICATIONS
| Application | RPM | |
|---|---|---|
| Federal | ||
| Man. Trans. | 800 | |
| Auto. Trans. | 900 | |
| Calif. | 900 | |
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.