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 PASSENGER, 2.5 E, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSSERVICING - A/TADJUSTMENTSVACUUM REGULATOR VALVE TEST (DIESEL ONLY)DIAGNOSIS & TESTING
1985 Chevrolet Astro Van Passenger, 2.5 E, Automatic
Diagnosis & Testing
1985 Chevrolet Astro Van Passenger, 2.5 E, AutomaticSECTION Diagnosis & Testing
- Loosely assemble throttle position switch to fuel injection pump with throttle lever in closed position. Attach an ohmmeter across terminals IGN (Pink wire) and EGR (Yellow wire).
- Insert "switch-closed" .624" (15.8 mm) Gauge Bar for Emission Label Code YJH or .646" (16.4 mm) Gauge Bar (J-33043) for all other models, between gauge boss on pump and wide open stop screw on throttle shaft. Rotate and hold throttle lever against gauge block.
- Rotate throttle switch clockwise (facing throttle switch) until continuity occurs (high meter reading) across terminals. Hold switch body at this position and tighten mounting bolts to 4-5 ft. lbs. (5-7 N.m).NOTE: Switch point must be set only while rotating switch body in clockwise direction.
- Release throttle lever and allow it to return to idle position. Remove "switch-closed" gauge bar and insert "switch-open" .646" (16.4 mm) Gauge Bar (J-33043) for Emission Label Code (YJH) or .668" (16.9 mm) Gauge Bar for all other models. If no continuity exists, switch is set properly. If continuity exists, switch must be reset or replaced.
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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.