I was under the impression that the EGR was usually only activated during warmup. When the engine is running and warm, I have been told that the EGR remains closed. I suppose that this is erroneous.

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83 W123 240D
76 300D, "Lil Yellow Car"
1978 Cessna 172N 180 HP Mod

"If life ain't fun, I'm not interested"

The important things are those that you learn after you know it all.
Chip Foose

Build a better mousetrap and you will REALLY infuriate corporate america.