Saturday, April 26, 2014
How to Test a Chevrolet Electronic EGR Valve
The EGR (exhaust gas recirculation) valve is an important component to a cars exhaust system and can help your engine run more efficiently. The EGR valve pushes exhaust gas back into the combustion chamber -- this hot gas helps to heat the air and fuel mixture faster, saving the engines energy. If you notice your car has a rough idle, it is recommendable to test the EGR valve. These steps apply to Chevrolet EGR valves.
Instructions
- 1
Engage the vehicles parking brake, and put the car into neutral (for manual transmission models) or park (for automatic models).
2Open the hood, and locate the EGR valve, which is on the intake manifold. After you have located it, start the car, let it run for five minutes, and then turn it off.
3Remove the vacuum hose from the EGR valve. This hose is on the top part of the valve. Once you have removed the vacuum hose, replace it with the hose from the hand vacuum pump.
4Use the pump on the hand vacuum pump to give 10 inches of vacuum to the EGR valve. Once you have done this, observe the EGR valves diaphragm -- a properly functioning EGR valve remains closed for 15 to 20 seconds with 10 inches of vacuum. If your valve takes longer to open, it is time to replace it because of leakage.
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