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 MANUALSCHEVROLET1989CAPRICE BASE, 4.3 Z, 700R4/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - 200-4RTESTINGPRESSURE TEST RESULTSHIGH OR LOW PRESSURES
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8
High or Low Pressures
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8SECTION High or Low Pressures
- T.V. cable out of adjustment, binding, unhooked, broken or wrong link.
- Throttle lever and bracket assembly binding, unhooked or mispositioned.
- Throttle valve or plunger valve binding.
- Pressure regulator valve binding.
- T.V. boost valve binding or wrong valve installed (causing low oil pressure only).
- Reverse boost valve binding.
- Manual valve unhooked or mispositioned.
- Pressure relief valve ball missing or spring damaged.
- Oil pump slide stuck or slide seal missing or damaged.
- Pump decrease air bleed orifice missing or damaged (causing low oil pressure only).
- Pump decrease air bleed orifice plugged (causing low oil pressure only).
- T.V. limit valve binding.
- Line bias valve binding in open position (causing high oil pressure).
- Line bias valve binding in closed position (causing low oil pressure).
NOTE:
Control valve assembly spacer plate and case should be closely inspected for corroded orifices and passages.
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.