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 MANUALSFORD1985RANGER 2.8 S, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMIDLE SPEED CONTROL SYSTEMDIAGNOSIS & TESTINGENGINE RUNNING QUICK TEST
1985 Ford Ranger 2.8 S, RWD, Automatic
Engine Running Quick Test
1985 Ford Ranger 2.8 S, RWD, AutomaticSECTION Engine Running Quick Test
- Start and run engine to stable idle. Upper radiator hose should be hot and pressurized. Carburetor should be off high cam.
- Turn ignition off. Connect a jumper wire from Self-Test Input (STI) to Pin 2. See Fig 1 .
- Set analog VOM on a DC voltage range to read from 0 to 15 volts DC. Connect VOM from battery positive post to Pin 4 Self-Test Output (STO) in the Self-Test Connector.
- Start and run engine to stable idle. Upper radiator hose should be hot and pressurized. Carburetor should be off high cam. Activate self-test.
- Observe and record all service codes. Service codes are transmitted to the Self-Test Output terminal in the form of timed pulses. On the analog meter each pulse equals 1 meter sweep.
- One-half second on-time pulse for each digit.
- Two seconds off-time between digits.
- Four seconds off-time between codes.
- Eight to twelve seconds before fast and service codes.
Example: 6 pulses (sweeps) equals digit 6; two second pause then 8 pulses (sweeps) equals digit 8, this will equal code 68.
SERVICE CODES
| Output Code | Go To | ||
|---|---|---|---|
| 11 | Test 3, Step 3) | ||
| 12 | Test 4 | ||
| 13 | (1) Adjust Minimum Speed Idle Screw | ||
| 58 | Test 2 | ||
| 68 | Test 3 | ||
| NO CODES | Test 5 | ||
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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.