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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSCODE 44 - LEAN EXHAUST INDICATION ("SCAN" DIAGNOSTICS)AIR SYSTEM
1987 Chevrolet Hi-Cube 6.2 J, 475/M40
Air System
1987 Chevrolet Hi-Cube 6.2 J, 475/M40SECTION Air System
Be sure air is not being directed to exhaust ports while in "Closed Loop". If block learn value goes down while squeezing air hose to left side of exhaust ports, service AIR management system. If okay, oxygen sensor is faulty.
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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.