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Without the egr valve opening properly it will have a tendency to detonate for several seconds after applying WOT. The ecu adds a considerable amount of timing anticipating a slower burn/inert gasses in the chamber.
Interesting - All these years I thought the absence of the egr would activate the MIL.
I posted an egr valve repair thread on here somewhere, for sticky diaphragm-to-sensor pins, perhaps it will save you some trouble.
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