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Re: I guess I don't understand Mercedes EGR monitor theory
Posted to Technical Discussion Forum on 2/25/2021 5 Replies

John,

I usually take a test drive while graphing the engine rpm, MAP sensor, EGR pid, at a minimum and if necessary I tee a vacuum gauge into the EGR valve line.

I've found anything from weak vacuum at the EGR valve to a faulty MAP sensor, even without a M... Login to read more.

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