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There are actually a few possible symptoms. If it is stuck open the engine may have a very hard time idling if it can Idle. Next would be a stuck closed or for some other reason inop egr valve would raise the Nitrous ox levels in a emission test. In some cases it can also cause a vehicle to Ping or detonate while driving. Next would be one that has a Vacuum leak in the shaft that opens the Valve. If it is leaking though to the outside it can also cause a Vacuum leak causing a ruff Idle. I most Ford it may also set a code in the computer turing on a check engine light.

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Q: What are the symptoms of a bad EGR valve on a Ford Explorer?
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