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Message: [QUOTE="BigRedDiesel, post: 1158328, member: 1754"] Here's the back story. We went to Indiana on a hunting trip, while there I parked the truck at the boat ramp. I didn't realize that the vegi pump was on with the diesel pump. Not that huge of a deal because the diesel will run at 60 PSI and vegi runs at 80 PSI. We left the ramp and was heading back to the hotel and the vegi tank ran dry and I guess it was throwing some air into the system. The truck started to have a miss like it was running out of fuel and I got it off the road before it stalled. I looked at the gauges and switches and that's when I realized the vegi pump was on. I turned it off and purged the system with diesel few times to get the air out. The truck started just fine and ran fine from there. We left to come home the next day and about two hours into the trip the CEL came on. I noticed that it would come on under acceleration and off when I let off the pedal. It did this for rest of the trip home. I ran my Aeroforce gauge and came up with P1316 which I know is an IDM code. When I got home I ran AE and ran every test I could with it. I came up with P1274 Cylinder #4 High to Low Side Open. Now the truck has what seems like a miss and the CEL is on all the time now. No new codes just the P1316, P1274 and two others but they are from my missing wastegate and missing AIH. I have a few ideas but I would like some ideas or suggestions on where to look, obviously at #4, but other things. Secondly What does "Cylinder #4 High to Low Side Open" mean anyway? [/QUOTE]

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