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International Automotive Technicians Network
Re: 2008 IH 4400
Posted to HD/Fleet Forum on 5/6/2019

Both of those should jump within 1 or 2 seconds. If you can see IPR% while cranking what is it? 60% should be about max you see. If it is higher the IPR may be failing. You can dead head the IPR valve. Unhook the IPR from the truck. Connect directly to the IPR... Login to read more.