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 M L4-151 2.5LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESNO OVERRUN BRAKING-MANUAL 3-2-1
1985 Chevrolet Astro Van M L4-151 2.5L
No Overrun Braking-Manual 3-2-1
1985 Chevrolet Astro Van M L4-151 2.5LSECTION No Overrun Braking-Manual 3-2-1
1. Throttle linkage incorrectly adjusted.
2. Throttle valve or 4-3 sequence valve stuck
3. Number 3 check ball incorrectly installed
4. Valve body spacer plate and gaskets incorrect, damaged or incorrectly installed.
5. Turbine shaft oil passages plugged or not drilled.
6. Turbine shaft seal rings damaged.
7. Turbine shaft sealing balls loose or missing.
8. Porosity in forward or overrun clutch piston.
9. Overrun piston seals cut or damaged.
10. Overrun piston check ball not seaing.
2. Throttle valve or 4-3 sequence valve stuck
3. Number 3 check ball incorrectly installed
4. Valve body spacer plate and gaskets incorrect, damaged or incorrectly installed.
5. Turbine shaft oil passages plugged or not drilled.
6. Turbine shaft seal rings damaged.
7. Turbine shaft sealing balls loose or missing.
8. Porosity in forward or overrun clutch piston.
9. Overrun piston seals cut or damaged.
10. Overrun piston check ball not seaing.
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.