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Re: 1989 Ford Truck, EGR quits, sets code 33
Posted to Technical Discussion Forum on 12/4/1999

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You are right on one point: The EVP (and yes, it was the EVP, not an AC switch) is hitting five volts, which is indeed higher than normal. Though the drop off only goes down to 1.1 volts, in real life... Login to read more.