By Chris Petris Illustration by Chris Petris A common question asked among C4 Corvette owners is “why does my engine run so hot? The cooling fans do not come on until the coolant temperature is way too hot”. Federal regulations required high operating temperatures to keep idle emissions at their designated levels. The oxygen sensor […]
Tag: C4
Corvette Central “no drone” dual outlet mufflers for 1984-1990 Corvettes.
Corvette Central is pleased to introduce our exclusive correct sounding dual outlet mufflers for the 1984-1990 Corvette. These are manufactured and welded in USA by Corvette Central (cases are manufactured in Canada). On the original 1984-1990 dual-outlet muffler, the inner outlet tube is for appearance only, and is blocked off. With our design, the outer […]
LS Engine Swap for C4 Corvettes
The following is an engine swap workshop guide that was produced by Chris Petris (www.petrisenterprises.com) in cooperation with Corvette Central, with assistance from Jared Ochs of Current Performance (www.currentperformance.com), and Chris McDonald of www.mcspeed.com. Developed in conjunction with GM Performance, Corvette Enthusiast, TCI, Holley and Vette Brakes & Products. Photo credit: Chris McDonald. We will […]
Tech Tips: C4-C6 Tire Pressure Monitoring Systems
Our technical assistance reps get a lot of questions regarding the Tire Pressure Monitor System (TPMS) that is standard on C4, C5, and C6 Corvettes. The TPMS became a requirement for all vehicles under 10,000 lbs. produced after September 2007. An interesting side note is that the band sensors which are so prevalent today were […]
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 […]
C2, C3 & C4 Air Conditioning 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 […]
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 […]
Automatic Transmission Maintenance
If you own a 1984 to 1996 Corvette you probably have an automatic transmission. Most Corvette owners prefer the automatic transmissions to the manual transmission. This means that most of you reading this article have an automatic transmission in your Corvette.
Electrical Diagnosis
The following is a workbook from a technical seminar that we sponsored during Corvettes at Carlisle in 2007. The workshop was hosted by Chris Petris from Petris Enterprises in Scottsboro, AL. The concept is to provide easy to understand electrical troubleshooting concerning all Corvette generations in layman’s terms. We’ll show you how to do this […]
Replacing the Front Spoiler: 1984 to 1996
Time: 2 Hours Tools: Sockets and screwdrivers Talent: (3) Applicable Years: 1984 to 1996 Tools: ¼-inch drive socket set and metric combination wrenches Tab: $100 Tip: You don’t have to replace the entire spoiler. Remember it comes in three pieces. The way these spoilers get abused you might want to consider doing one section each […]