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 MANUALSGMC1991SUBURBAN R1500, 7.4 NREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSTHROTTLE POSITION SENSOR (TPS)TPS ADJUSTMENT (GASOLINE)NOTES
1991 GMC Suburban R1500, 7.4 N
TPS Adjustment (Gasoline): Notes
1991 GMC Suburban R1500, 7.4 NSECTION Notes
NOTE:
On all models except 2.8L engine (VIN R), Throttle Position Sensor (TPS) is NOT adjustable. Resistance values given in TPS OUTPUT VOLTAGE TABLE are for reference only. If resistance value is not as specified, replace TPS. For testing procedures, refer to TESTS W/CODES - GASOLINE
or SYSTEM/COMPONENT TESTS
article in this section.
RENDER: 1.0x
NO RELATED
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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.