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 MANUALSGMC1992RALLY CAMPER SPECIAL 6.2 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSTHROTTLE POSITION SENSOR (TPS)TPS ADJUSTMENT ( GASOLINE)2.8L (VIN R)
1992 GMC Rally Camper Special 6.2 J
2.8L (VIN R)
1992 GMC Rally Camper Special 6.2 JSECTION 2.8L (VIN R)
Throttle Position Sensor (TPS) can also be adjusted using a scan tester. Perform this check only when throttle body parts have been replaced or after minimum airflow has been adjusted.
- Install 3 jumper wires between TPS and TPS wiring harness connector. Jumpers can be made using the following General Motors parts: Terminals No. 1214836 and 12014837.
- Turn ignition switch to ON position. DO NOT start engine. Using a DVOM, connect test leads to Dark Blue and Black wire terminals. With throttle at closed position, TPS voltage should be .42-.45 volt.
- If voltage reading is not as specified, rotate TPS until specified voltage is obtained. See TPS OUTPUT VOLTAGE . If specified voltage cannot be obtained, replace TPS.
- Tighten screws and recheck readings. Turn ignition off. Remove jumper wires and reconnect harness connector to TPS.
TPS OUTPUT VOLTAGE (GASOLINE)
| Application | (1) Voltage | ||||
|---|---|---|---|---|---|
| 2.5L (VIN E) (2) | 1.25 or less | ||||
| 2.8L (VIN R) | .42-.45 | ||||
| 3.1L (VIN D) (2) | 1.25 Or Less | ||||
| 3.8L (VIN L) | 0.38-0.42 | ||||
| 4.3L (VIN W & Z) (2) | 1.25 Or Less | ||||
| 5.0L (VIN H) (2) | 1.25 Or Less | ||||
| 5.7L (VIN K) (2) | 1.25 Or Less | ||||
| 5.7L CNG (VIN K) (2) | 1.25 Or Less | ||||
| 7.4L (VIN N) (2) | 1.25 Or Less | ||||
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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.