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 MANUALSCHEVROLET1987S10/T10 BLAZER 4WD V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1987 Chevrolet S10/T10 Blazer 4WD V6-173 2.8L
Throttle Position Sensor: Adjustments
1987 Chevrolet S10/T10 Blazer 4WD V6-173 2.8LSECTION Adjustments
THROTTLE POSITION SENSOR (TPS):
Verify that idle is at specified value.
Make all checks/adjustments with engine at operating temperature.
Carburetted Models: Remove aluminum plug covering the adjustment screw. Remove the screw and connect a digital voltmeter from the TPS center terminal to the bottom terminal. Apply thread locking compound tot he screw and with ignition on and engine not running (as applies), quickly adjust screw to obtain specified voltage at indicated condition.
Fuel Injected Models: Disconnect harness multi-plug from TPS. Using three six-inch jumper wires, reconnect harness to TPS. With ignition on and engine not running, connect a digital voltmeter to terminals A and B of TPS harness. If TPS is adjustable, loosen the unit retaining screws and rotate the unit to obtain the specified value.
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.