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/TRANSAXLETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSSPECIAL TESTING PROCEDURESSTALL SPEED TEST
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Stall Speed Test
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Stall Speed Test
STALL TEST
NOTE: The stall test checks converter one-way clutch operation and installation, the holding ability of the forward clutch, reverse clutch, the low and reverse bands, the planetary one-way clutch, and engine performance. Perform test with engine coolant and transmission fluid at operating temperature. Prepare for stall test as shown in the Stall Test Preparation Chart.
1. Firmly apply service and parking brakes.
2. Find specified stall RPM in the Stall Speed Specification Chart and use grease pencil to mark RPM on dial of tachometer.
3. Connect marked tachometer to engine.
4. With transmission in ranges D, 2, 1, and R, press the accelerator to the floor and hold it just long enough to let the engine reach full RPM.
NOTE: Do not hold throttle open for more than five seconds at a time.
5. Note results in each range.
6. After each range, move selector lever to N and run engine at 1,000 RPM for approximately 15 seconds to cool the converter before making the next test.
7. If stall speeds are not within specifications, determine cause from the Stall Test Diagnosis Chart.
CAUTION: If engine speed recorded by tachometer exceeds specifications, release accelerator immediately.
Stall Test Preparation Chart:
NOTE: The stall test checks converter one-way clutch operation and installation, the holding ability of the forward clutch, reverse clutch, the low and reverse bands, the planetary one-way clutch, and engine performance. Perform test with engine coolant and transmission fluid at operating temperature. Prepare for stall test as shown in the Stall Test Preparation Chart.
1. Firmly apply service and parking brakes.
Stall Speed Specification Chart:
2. Find specified stall RPM in the Stall Speed Specification Chart and use grease pencil to mark RPM on dial of tachometer.
3. Connect marked tachometer to engine.
4. With transmission in ranges D, 2, 1, and R, press the accelerator to the floor and hold it just long enough to let the engine reach full RPM.
NOTE: Do not hold throttle open for more than five seconds at a time.
5. Note results in each range.
6. After each range, move selector lever to N and run engine at 1,000 RPM for approximately 15 seconds to cool the converter before making the next test.
Stall Test Diagnosis Chart:
7. If stall speeds are not within specifications, determine cause from the Stall Test Diagnosis Chart.
CAUTION: If engine speed recorded by tachometer exceeds specifications, release accelerator immediately.
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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.