For several days now the Excursion seems to fall on it's face when accelerating...like it stalls then picks back up and goes. It was happening when cold, but today it happened at operating temperature and died, which hasn't happened before. It cranked right back up and drove home. When it first happened I checked for codes and there was nothing. This sounds to me to be the CPS and I've checked the tin nut. There's no oil in the ICP, but I did unplug it for a couple days and it didn't happen. The reason I did this is it seems to be electrical.

 

I had a ipr fail one time acting kind of like that. It was sticking internally. Power would randomly come and go and ipr% would climb with no change in icp psi. Then some times it would be just fine. Swapped in new ipr and all was good.

 

Recommend logging with FORScan for a few drives and see if you can catch the issue next time it happens. What are you using to pull codes?

 

Forscan...

 

Thought about that too and might change back to the original good one...the one in there now is a year and a half old. I was thinking it might be the electrical side though...

 

Have you open the loom at the IPR connector? The insulation on the wires will actually turn to goo inside the loom and allow the wires to intermittently short out. The only way to find it is to open the loom 6-8 inches and physically inspect the wires themselves.

 

I had a similar intermittent failure present itself in January.

Learn more: https://www.ford-trucks.com/forums/1...-the-road.html

I bought a new CPS to replenish the one I used and also bought a new Motorcraft IPR to keep as a "OH CRAP, NOW WHAT" spare.

 

I have had the electrical side fail on one as well symptoms of it were it would die when got hot. Cool it off with some water and it would be fine until it got hot again. If you suspect the electrical side you can just try swapping the electrical magenet part with another one and see if it changes anything. Thats simple and fast to do.

 

I will look at that today.

 

I read that when it happened and I was surprised you stated it was 24 years old and it hadn't been replaced when Ford recalled them several years back. What's happening with mine is a little defferent. I started the truck from sitting over night in the garage, backed out of the driveway, and gave it some pedal to get down the road. When I hit about 20mph it had the hicup...like the key was turned off then quickly back on...then ran fine the rest of doing some errands. It was so quick I thought maybe it was me, so I checked for codes and nothing. So the next day we took it to a track meet about 25-30 miles away and it ran fine though when parking I thought I noticed it running weird. We were at the meet for about 4 hours so the truck was cooled back down a bit. We load up and leave. After navigating through the parking lot, I turn to get onto the main street and give it some pedal to get down the road and when I hit about 30mph it happens again. The next day I needed to go get it washed so I back it out of the garage, shut it down, pull the ICP plug, and left it unplugged even though there's no oil present in there. It ran fine to and from the car wash place. The next dayI start the truck in the garage after sitting, drive around the block and it seemed fine so I plugged the ICP back up. Later that day which was yesterday, I took our youngest daughter to the high school track to run her for about an hour given she has a district meet Monday and Wednesday. We leave there and go to HEB to pick up some groceries. When we leave I turned onto the main road and upon leaving the stop light the truck did it again about the same speed, but it died this time. I coasted to a stop in the turn lane, put it in park, and it cranked back up so we ran on home about 3-4 miles away.

 

I thought about that the other day, but it's intermittent given it will do it before it gets up to operating temperature and/or cooled off some as you'll see in my more detailed post above to Sous...

 

Prior to my truck being intermittently dead on the side of the road. I say intermittently because sometimes it would start and stay running. Sometimes it would start and immediately stall. Sometimes it wouldn't start at all.

Prior to that, I would be driving on a smooth road at 55 MPH or so and it would die. Sometimes I could put it in neutral and restart it. Sometimes I would coast to the side of the road, shut off the ignition and restart it. Looking back on it now, I had similar symptoms in the past from time to time and the first one was about 4 years ago going through TN when I hit a big pot hole. At the time, I thought maybe the Hydra chip had been rattled loose a bit and maybe that was the case. Maybe not...

Electrical gremlins are worse than the "real" gremlins from the movie...

I wish you the best of luck sir and

 

Okay then, so given I also have some known good spare sensors I'll swap the CPS which is only a couple years old when I look at the ICP pigtail today. It's just odd that it's doing this when it's not fully up to operational temperature and not every time it's driven in that condition. It seems to be getting worse and I'm leaning towards electrical.

 

Hows that wire loom looking at the 42 pin on the driverside valve cover? Easy check.

 

It's fine as I checked and wrapped here the first part of the year when I was doing some other maintenance items to the truck...