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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 6.5L DIESEL)FUEL SYSTEMIMPORTANT PRELIMINARY CHECKSVISUAL AND PHYSICAL CHECKS
1987 Chevrolet Hi-Cube 6.2 J, 475/M40
Visual and Physical Checks
1987 Chevrolet Hi-Cube 6.2 J, 475/M40SECTION Visual and Physical Checks
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
The visual and physical checks are very important. The checks can lead to correcting a problem without further checks which may save valuable time.
- Check the Control Module grounds for being clean, tight and in their proper location.
- Check the vacuum hoses for splits, kinks and proper connections, as shown on the Vehicle Emission Control Information label.
- Check thoroughly for any type of leak or restriction.
- Check for air leaks at all the mounting areas of the intake manifold sealing surfaces.
- Check the wiring for the following items: -
- Proper connections
- Pinches
- Cuts
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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.