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 MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEGOVERNORTESTING AND INSPECTION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Governor: Testing and Inspection
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Testing and Inspection
GOVERNOR TEST
NOTE: The governor can be checked at the same time as the Control Pressure Test is performed and in the same manner.
1. Raise and support rear of vehicle, then disconnect and plug the vacuum line to the vacuum diaphragm unit.
2. Connect the line from the distributor tester to the vacuum diaphragm unit and install automatic transmission tester.
CAUTION: Never exceed 60 MPH speedometer speed.
3. Place transmission in D2, with no load on engine, and apply 10 inches of vacuum to vacuum diaphragm unit.
4. Increase speed slowly and watch speedometer, noting speed at which control pressure cutback occurs. It should occur between 8 and 12 mph.
5. Decrease vacuum at vacuum diaphragm to 0.0-2.0 inches. Control pressure cutback should occur between 10 and 14 mph.
NOTE: After each test, move selector to N and run engine at 1,000 RPM to cool transmission.
6. The governor is good if cutback occurs within specifications. If cutback does not occur within specifications, check shift speed to verify that it is the governor and not a stuck cutback valve, then repair or replace governor as necessary.
NOTE: The governor can be checked at the same time as the Control Pressure Test is performed and in the same manner.
1. Raise and support rear of vehicle, then disconnect and plug the vacuum line to the vacuum diaphragm unit.
2. Connect the line from the distributor tester to the vacuum diaphragm unit and install automatic transmission tester.
CAUTION: Never exceed 60 MPH speedometer speed.
3. Place transmission in D2, with no load on engine, and apply 10 inches of vacuum to vacuum diaphragm unit.
4. Increase speed slowly and watch speedometer, noting speed at which control pressure cutback occurs. It should occur between 8 and 12 mph.
5. Decrease vacuum at vacuum diaphragm to 0.0-2.0 inches. Control pressure cutback should occur between 10 and 14 mph.
NOTE: After each test, move selector to N and run engine at 1,000 RPM to cool transmission.
6. The governor is good if cutback occurs within specifications. If cutback does not occur within specifications, check shift speed to verify that it is the governor and not a stuck cutback valve, then repair or replace governor as necessary.
RENDER: 1.0x
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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.