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.
1987 Chevrolet Hi-Cube 6.2 J, 400/M40FACTORY OEM SERVICE PROCEDURE
Air System
- To determine if excessive noise is fault of Air Injection Reactor System, operate engine with air pump drive belt removed. If excessive noise does not exist with belt removed, inspect pump for damage.
- Inspect drive belt for wear, cracks or deterioration. Check for seized air pump. Check for improper pump mounting and bolt torque. Check for improper routing and connection of hoses. If none of these conditions exist and pump is still excessively noisy, replace air pump.
CAUTION:
DO NOT
oil air pump. Pump will be damaged if any liquid is injected.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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