C4 Fuel Injection Overview

Speed density was the first fuel control system used on 1982-1984 Corvettes. It was also used on the 1990-1993 cars. Speed density uses a manifold absolute pressure sensor (MAP sensor) to calculate the necessary fuel load. The 1990-1991 cars have a MAP sensor bolted directly to the intake plenum. The 1992-1993 cars have the MAP […]

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C2, C3 & C4 A/C Retrofit

Basic System Operation The compressor pressurizes the refrigerant then it enters the A/C condenser as a gas. The high temperature, high pressure gas is cooled as it goes through the condenser. This changes the gas to a liquid. Then the liquid goes to the evaporator through an expansion valve or metered orifice. This quickly depressurizes […]

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C2 & C3 Troubleshooting

By Chris Petris The most important tool to use when troubleshooting is a good memory or notes. If necessary, write down as much information as possible. This will help compile a troubleshooting notebook. A factory service manual is an invaluable tool when diagnosing problems. A road test is very important and notes should be taken […]

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C4 Interior Overview

The C-4 interior is comprised mostly of plastic. The 1984-1989 dash carrier is made entirely of plastic. All of the plastic dash fascia can be damaged quite easily just by over-tightening the screws. I use a screwdriver or a clutch-operated power screwdriver. When using a clutch-operated screwdriver, be sure to use the lowest setting to […]

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Corvette Glossary of Terms

For your convenience, the following is a glossary of terms commonly used in the Corvette community. ABS Anti-lock Braking System.  Sensors monitor wheel rotation and prevent wheel lockup during braking by modulating hydraulic pressure. ASR Acceleration Slip Regulation A-Pillar The post section between the door glass and the windshield.

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