Q: what can happen if the EGR has been missing and we are unaware and drove any way on 1997 Plymouth Voyager

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were fixing other things like the idle air control motor and its running again please help me?
(1) Answer
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The purpose of the EGR is to lower combustion temperature in the engine and therefore reduce NOx and the EGR reduces the risk of ignition detonation you may have heard the term "pinging" you would hear "pinging" if you had bad gas or were climbing a hill under load in too high a gear, the EGR by lowering the temperature in the cylinders reduces pinging. Idle Air Control (IAC) will help maintain the engine idle speed when electrical loads and air conditioning are turned on.
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