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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSOIL PRESSURE CHECK
1990 Chevrolet Lumina APV V6-191 3.1L
Oil Pressure Check
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Oil Pressure Check
1. Check transaxle oil level.
2. Check and adjust throttle valve cable.
3. Check shift linkage adjustment.
4. Ensure engine is properly operating.
5. Connect oil pressure gauge to transaxle and tachometer to engine.
6. To check minimum throttle valve line pressure, have throttle valve cable at its minimum travel position, then with brakes applied, transaxle in range specified and engine at specified speed, check pressures according to chart.
7. To check full throttle valve line pressure, tie or hold the TV to the full extent of its travel, then with brakes applied, transaxle in range specified and engine at specified speed, check pressures also according to the chart.
2. Check and adjust throttle valve cable.
3. Check shift linkage adjustment.
4. Ensure engine is properly operating.
5. Connect oil pressure gauge to transaxle and tachometer to engine.
6. To check minimum throttle valve line pressure, have throttle valve cable at its minimum travel position, then with brakes applied, transaxle in range specified and engine at specified speed, check pressures according to chart.
7. To check full throttle valve line pressure, tie or hold the TV to the full extent of its travel, then with brakes applied, transaxle in range specified and engine at specified speed, check pressures also according to the chart.
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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.