How to Tell If the EGR Valve in the 1994 Chevy Is Bad?by Johnathan Cronk
General Motors manufactures the vehicles sold under the Chevy brand. Chevy offers cars, trucks, SUVs and minivans. All Chevy vehicles are equipped with an exhaust gas recirculation (EGR) valve, which maintains engine efficiency by directing exhaust gases into the intake manifold. These gases are cooled before they enter the engine, allowing the engine to run cleanly and smoothly. It's important to check the EGR valve regularly to make sure that it is working properly and does not need to be replaced.
Park the Chevy and let it sit for a half hour. This will ensure that the components are cool and prevent potential burns.
Open the hood of the vehicle and locate the EGR valve. The EGR valve on a 1994 Chevy is on the lower intake manifold beside the throttle body. The EGR valve is a circular metal component with a vacuum hose coming off of it. If you can't locate the EGR valve, refer to your owner's manual.
Turn the engine on and allow the valve to warm up for two minutes. Have someone help you, as the engine will need to be revved while you watch the valve plunger. The plunger controls the exhaust gases being circulated into the engine.
Examine the valve as the engine is revved. The plunger mechanism on the valve should move up and down quickly. If the plunger moves slowly or does not move at all, the valve needs immediate maintenance or replacement.