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 MANUALSCHEVROLET1987FORWARD CONTROL 4.8 T, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - TBIOVERHAULREASSEMBLY (MODEL 700)THROTTLE BODY
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40
Throttle Body
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40SECTION Throttle Body
- Install tube assembly using a new gasket. Install throttle position sensor. Before installing idle air control valve, measure distance between tip of valve pintle and mounting surface. Distance should not exceed 1 1/8" (28 mm).
- If distance is incorrect, exert firm pressure on pintle while moving pintle from side to side until distance is correct. The flange mounted IAC valve on 2.5L engines has a dual taper, 10 mm diameter pintle. Ensure replacement valve has same shape and diameter of valve removed.
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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.