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 PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER M4M SERIES 4-BBLADJUSTMENTSCHOKE UNLOADER
1985 Chevrolet Astro Van Cargo, 4.3 N, Standard, MH3
Choke Unloader
1985 Chevrolet Astro Van Cargo, 4.3 N, Standard, MH3SECTION Choke Unloader
NOTE:
Adjustment is performed using choke valve angle gauge. See ANGLE GAUGE ADJUSTMENT TOOL procedure at beginning of ADJUSTMENTS.
- Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Attach angle gauge and set angle to specification.
- Hold secondary lock-out lever away from pin. Hold throttle lever in wide open position. See Fig 1.
- To adjust, bend fast idle lever tang until bubble of angle gauge is centered.
NOTE:
Adjust with secondary lock-out lever held away from pin.
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.