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, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (VACUUM DIAGRAMS)EMISSION CONTROL DEVICE ABBREVIATIONS
1987 Chevrolet Hi-Cube 6.2 J, 400/M40
Emission Control Device Abbreviations
1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Emission Control Device Abbreviations
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.
ABBREVIATION DEFINITIONS
| Abbreviation | Definition |
|---|---|
| A/CL | Air Cleaner |
| AIR | Air Injection Reactor |
| A/T | Automatic Transmission |
| CCV | Crankcase Control Valve |
| CNG | Compressed Natural Gas |
| CPI | Central Port Injection |
| DISTR | Distributor |
| DVTR | Diverter Valve |
| EFE | Early Fuel Evaporation |
| EGR | Exhaust Gas Recirculation |
| EGR SOL | EGR Solenoid |
| EPR | Exhaust Pressure Regulator |
| ESC | Electronic Spark Control |
| HVAC | Refers to A/C System |
| MAP | Manifold Air Pressure Sensor |
| M/T | Manual Transmission |
| MTR | Motor |
| PCV | Positive Crankcase Ventilation |
| PFI | Port Fuel Injection |
| TBI | Throttle Body Injection |
| TRC | Throttle Return Control |
| TVS | Thermal Vacuum Switch |
| VAC | Vacuum |
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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.