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 MANUALSCHEVROLET1985SUBURBAN C10, 6.2 CREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - DIESELADJUSTMENTSTHROTTLE POSITION SWITCH (TPS)6.2L ENGINES ONLY
1985 Chevrolet Suburban C10, 6.2 C
6.2L Engines Only
1985 Chevrolet Suburban C10, 6.2 CSECTION 6.2L Engines Only
- Loosely assemble throttle position switch to fuel injection pump with throttle lever in closed position. Attach a continuity meter across terminals (Pink wire and Yellow wire on light duty engines).
- Insert proper "switch-closed" gauge block, between gauge boss on injection pump and wide open stop screw on throttle shaft. Rotate and hold throttle lever against gauge block.
- Rotate throttle switch clockwise (facing throttle switch) until continuity pivot occurs (high meter reading) across terminals. Hold switch body at this position and tighten mounting bolts to 48-50 INCH lbs. (5-7 N.m).NOTE: Switch point must be set only while rotating switch body in clockwise direction.
- Release throttle lever and allow it to return to idle position. Remove "switch-closed" gauge block and insert "switch-open" gauge block. Rotate throttle lever against "switch-open" gauge block. There should be no continuity across terminals.
- If no continuity exists, switch is set properly. However, if there is continuity, then switch must be reset by returning to step 1) and repeating entire procedure. See Fig 1 .
TPS GAUGE BLOCK SPECIFICATIONS
| Application | Dimension | |
|---|---|---|
| Switch Closed | ||
| Auto. Trans. | .646" (16.4 mm) | |
| Man. Trans. | .602" (15.3 mm) | |
| Switch Open | ||
| Auto. Trans. | .668" (16.9 mm) | |
| Man. Trans. | .624" (15.8 mm) | |
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.