Traveling for the holiday we took my wifes 2000 Excursion with 178K on the V10 to her aunts place in MI. I filled the tank before we left and then I learned what she has not been telling me. With a full tank only, the fuel gauge will geek out and bounce all over then the low fuel light comes on and the oil light come on. After about 3 or 4 seconds the lights go off and slowly the gauge will normalize at 3/4 and move back to full. This only happens under a load and between 37 to 65mph. the truck also bucks like crazy in that speed range when under a load. I thought it was a coil pack as it was similar in reaction to the last several times a coil pack went out. However, I get no codes of any kind and the lights and fuel gauge added in there toss me for a loop. Not sure if this ties into it or not but.... The remote start no longer works and the rear defrost doesn't appear to be working and when stepping on the brakes you can here the switch click under the dash. Does all of this link to a single electrical issue, multiple electrical issues or a combo of electrical and transmission?

Thanks for any leads, we are miles from home and I'm just trying to make sure I don't kill the truck on the ride back through Chicago. Cruise set at 70mph the truck runs awesome.

 

What are you using to read codes? I think it would be handy to have live data as you drive and recreate the problem. If you do not have a super good scanner, then maybe take it to a shop and pay the $100 to have them read the deep stuff.

A bad coil pack will not necessarily throw a code. Do you have a spare to swap in there?

Do you have a way to read fuel pressure?

Do all or some of the problems go away as the fuel is used up?

 

I've used a basic code reader and my Torqe Pro reader. I don't have a spare CP and if I did I wouldn't know where to start other than replacing one at a time and hoping it's not number 10. There is a dealer right around the corner from where we are at so I was thinking of taking it there today and see if they can plug it in today.

 

I would take it to the dealer, since you are away from home.

 

Great news. I looked under the hood and found a small crack in the CP for cyl 2. Real easy to get to. It was between where the leads plug in and the main body of the CP. Took me all of 3 minutes to replace it and the truck seems to run much better.

Next I need to fill the fuel tank and see if the fuel and oil lights come on and off again or if somehow the CP set those off.

 

Great to hear that the COP was easy to spot. Hopefully everything else will go as well.