Mitchell on demand has a 5 condition test sequence for that egr system. Condition # 1. idle, no vacuum. #2. 3000rpm, 2-6 in. Hg. #03. 3000rpm (w/egr bleed plugged), less than 2 in Hg. #4. hard acceleration, 2-6 in. Hg. #5. deceleration, no vacuum.

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