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The EGR (exhaust gas recirculation) valve redirects exhaust gases back to the intake manifold and cools the cylinders down. On something that old, it's probably vacuum operated. A vacuum line going into the top of the valve pulls up a pintle. One side of the valve has a hose from the exhaust, and the other side goes to the intake.

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Q: What is the egr valve for in 91 wrangler?
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