The LT1 was a high-performance small-block engine designed and manufactured by General Motors. It is not to be confused with the "LT-1," a high-output GM engine from the 1970s. Produced from 1992 to 1997, the LT1 was used in many GM vehicles ranging from the Chevrolet Corvette, Camaro and Caprice to the Pontiac Firebird, the Cadillac Fleetwood and a couple of Buicks. The LT1 used an EGR valve to recirculate some of the engine exhaust gas back into the engine cylinders, ensuring proper fuel consumption and engine efficiency. It's important to know where the EGR is located in your LT1 engine and how to remove it in case you need to clean or replace it.
Place your car's transmission in "Park," turn off the LT1 engine and allow it to cool with the engine off. This will ensure components are cool to touch and prevent possible burns.
Locate the EGR valve under the hood. The valve is located directly behind the intake manifold. It is a mushroom-looking valve with a small hose coming out of the side of it.
Use a socket wrench to loosen and remove the two bolts securing the valve. The valve will now be loose. Set the bolts in a safe location for reinstallation.
Disconnect the valve by pulling the electrical connector out of the top of the valve. Place the electrical connector to the side.
Locate the gas feed hose, which is on the side of the valve. Pull the hose out of the valve. Now you can remove the EGR valve. Pull the valve off the manifold; some force may be required depending on the carbon buildup surrounding the unit. Once removed, your LT1's EGR valve is ready for maintenance or replacement.
