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EGR control question: 1990 C1500 5.7
Posted to Technical Discussion Forum on 2/12/2007 8 Replies

Hello all,

Working on a '90 Chevy C1500 for emissions failure, failed on NOx. Testing showed no/intermittent vacuum to the EGR valve while running on dyno, traced problem down to a bad control solenoid pigtail. Replaced pigtail and now I've got a REALLY stra... Login to read more.

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