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 MANUALSCHEVROLET1985ASTRO VAN CARGO, 4.3 N, STANDARD, MH3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 4-CYLADJUSTMENTSCOLD (FAST) IDLE RPM1.9L
1985 Chevrolet Astro Van Cargo, 4.3 N, Standard, MH3
Cold (Fast) Idle Rpm: 1.9L
1985 Chevrolet Astro Van Cargo, 4.3 N, Standard, MH3SECTION 1.9L
- Run engine until warm. Disconnect and plug distributor, idle compensator and EGR vacuum hoses. Fast idle speed should be about 3200 RPM.
- Throttle valve opening at first step of fast idle cam should be 15-17°. Adjust if necessary by turning fast idle screw.
COLD (FAST) IDLE (RPM)
| Application | RPM | ||
|---|---|---|---|
| 1.9L | (1) 3200 | ||
|
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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.