I've got an 05 f250 6.0l, I keep up on repairs and change the oil and fuel filters regularly. The truck is stock accept for an EGR delete but the EGR sensor is still in place and plugged in. I've been having some issues with the truck that are similar to this thread https://www.ford-trucks.com/forums/1...code-help.html
. i read through that post pretty well and studied wiring diagrams pretty well and i;'m just not getting this.
The truck was running great until about a month ago when I went to tow my boat to Florida, Its just a 21ft tritoon that weights maybe 3800#s. I got about 3hrs into the trip and the truck stated I would say hiccupping and then started running a little rough. then the Wrench light came on. I have an Edge CTS 2 so I checked the codes and I had a number of codes. The codes I got initially where:
I brought the truck into a Ford dealer who had a fleet/commercial department to diagnose the truck. they said that everything was where it should be on their computer. They did a wiggle test on wires while truck was running and drove the truck while graphing data and found nothing. the truck did not act up.
Next we drove the next 1000 miles with no problems. although a P2286 ICP code did come up a time or two the truck ran great. while I Florida, the truck continued to run fine however I did keep seeing a p2286 ICP code a time or two but this did not affect drivability.
When we went to return home 3 weeks later the truck ran great for the first 300 miles no problems at all. We stopped the first night in Georgia. The next day the truck started acting up like it had done I the beginning only worse. I kept seeing P2286, P2287, P0405, P2138, P2139. I would clear the codes and they would return sometimes an EBP code would come up at well sometimes the ICP codes would come up but not the ACC pedal codes. The truck ran like crap. I could barley get power up hills it would spit and spudder so badly that it was almost undriveable. When i shut the truck off and let it sit for 5 minutes the truck starts and runs great, then a couple minutes into driving the starts shuddering again and starts acting up.
I replaced the EBP sensor and pigtail about 20,000 miles ago with an OEM part, I just replaced the ICP sensor but not the pigtail (the pigtail was replaced about 30,000 miles ago). I have tried to unplug each sensor individually and it does not improve drivability. I unplugged the batteries and let them sit for 20 minutes and again it will run fine for about 2-3 minutes max then it will start acting up again.
After the truck as been shut off for a few minutes and restarted ICP PSI seems normal at 575 idle and about 4017psi at WOT (icp volts at 4.7v WOT). when the truck states acting up ICP psi at idle jumps to 870PSI at idle and maintains 3450 at WOT with ICP volts at 3.5 WOT.
KOEO ICP volts 0.2v
ICP volts @ low idle were 1.5-1.6v they dropped to 1.2v @ high idle when not fully warm
ICP volts @ low idle were 1.2 v (850 psi) they rose to 1.3v (980 psi) on high idle fully warmed up.
i used a voltmeter to check VREF at each sensor and ICP, MAP, EGR, EBP, and the Pedal all had 4.99v constant. its worth noting that the ICP did start at 5.07v and then moved down to 4.99v but did not change from 4.99v.
I don't really know what else to do. This seems like it should be a ICP issue but everything is testing fine. I mean i know the VREF connects the pedal, map, egr, ebp, baro, and icp sensors but they all seem fine. Its also weird that when the truck is idling at 850psi i can rev it up slightly and the ICP psi does not change. if i give it a little more gas it will climb above 850psi. Its almost as though ICP is actually at 570psi but the sensor thinks its higher. Maybe this is just me making things up in my head though. its so weird to me that the truck runs perfect when its left to sit for awhile then will act up a few minutes later.