Solarjeff Posted April 25, 2020 Share Posted April 25, 2020 Truck goes down the road and then goes limp with no throttle response and sits at 600RPM until you pull over. Once on the side of the road and fully stopped it just shuts off and then fires right back up and good to go some more. Sometimes you get 5 minutes, sometimes 30 minutes. All battery cables and ECM cables are tight and clean. Found oil in harness leading to low oil cutoff on pan and cleaned harness, plug and sensor. Found source of oil leak to be o-ring on side of valve cover. ECM connectors are dry and clean. Drove truck again and Same issues afterward. No codes on dash. Quote Link to comment https://www.bigmacktrucks.com/topic/62233-2009-mp7-granite-shuts-down/ Share on other sites More sharing options...
Solarjeff Posted April 25, 2020 Author Share Posted April 25, 2020 Sorry truck is 2010 not 2009 if that matters with 233,000 miles. Quote Link to comment https://www.bigmacktrucks.com/topic/62233-2009-mp7-granite-shuts-down/#findComment-449658 Share on other sites More sharing options...
Mark T Posted April 25, 2020 Share Posted April 25, 2020 Might be the crankcase pressure sending unit. Quote Link to comment https://www.bigmacktrucks.com/topic/62233-2009-mp7-granite-shuts-down/#findComment-449660 Share on other sites More sharing options...
fjh Posted April 26, 2020 Share Posted April 26, 2020 19 hours ago, Solarjeff said: Truck goes down the road and then goes limp with no throttle response and sits at 600RPM until you pull over. Once on the side of the road and fully stopped it just shuts off and then fires right back up and good to go some more. Sometimes you get 5 minutes, sometimes 30 minutes. All battery cables and ECM cables are tight and clean. Found oil in harness leading to low oil cutoff on pan and cleaned harness, plug and sensor. Found source of oil leak to be o-ring on side of valve cover. ECM connectors are dry and clean. Drove truck again and Same issues afterward. No codes on dash. Disconnect the big plug at the engine ECU and wash the oil out with brake clean see how that goes for ya! just something to try! This was a common issue at one point! Quote Link to comment https://www.bigmacktrucks.com/topic/62233-2009-mp7-granite-shuts-down/#findComment-449701 Share on other sites More sharing options...
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