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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 31 (ENGINE CONTROLS - REMOVE/INSTALL/OVERHAUL)FUEL SYSTEM (GASOLINE)THROTTLE BODY (TBI)DISASSEMBLY (THROTTLE BODY COVER MODEL 220)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Disassembly (Throttle Body Cover Model 220)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Disassembly (Throttle Body Cover Model 220)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Place throttle body on Holding Fixture (J-9789-118 or BT-30-15) to prevent damage to throttle valve. Remove cover-to-throttle body screws (note location of 2 short screws). Remove throttle body cover. See Figure. Throttle body cover and pressure regulator are serviced as an assembly. DO NOT remove pressure regulator-to-cover screws.
- Remove TP sensor, IAC, fuel injectors, fuel filter, rubber parts, and diaphragms. Clean all remaining (metal) parts in a cold immersion-type cleaner such as Carbon X (X-55). Blow dry with compressed air. Inspect mating surfaces for damage which may prevent gasket sealing. Repair or replace faulty components.
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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.