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International Automotive Technicians Network
Re: GM P0401 ' EGR SYSTEM FLOW INSUFFICIENT' QUESTION
Posted to Technical Discussion Forum on 3/1/2007

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The exact MAP reading would depend on throttle position and altitude. To start, you should monitor MAP at KOEO, idle and WOT. KOEO should be about 4.5v. At idle it should be about 1v. At WOT it should... Login to read more.