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 - TBIOVERHAULDISASSEMBLY (MODEL 220)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
Remove throttle position sensor. Invert throttle body assembly and place on clean, flat surface. Remove screws and idle air control valve (7.4L engine) or remove idle air control valve by using a 1-1/4" (32 mm) wrench.
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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.