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I can't find any listing showing that this 4.2 6 cylinder engine uses an EGR valve, and I have read chevy owners saying the same thing about this engine. It does have a block off plate, but no valve mounted. If had one it would be bolted to the top passenger side of the engine
Passenger side of engine compartment. Just below the air duct after the mass air flow sensor. Straight down below throttle positioning sensor. Sorry don't have diagram. Hope this helps.
Symptoms of a bad EGR valve are usually stumbling idle or the engine stalling when the car is warm (normal operating temperature). Find the EGR valve and locate the vacuum line attached to it. Start the engine cold and wait for it to warm up. When the engine starts to stumble, pull off the vacuum line. If the EGR is bad, the engine idle will stabilize and no longer stumble.
It's a valve not a sensor.
Where? it depends what engine do you have 4 cyl 6 cyl?
How do you know the EGR valve could be bad? check engine light on? OBD code? diagnostic made?
Help us to help you please provide more information
Hope it will help
Dan
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