Excursion Electrical Shut-down Help Stuck on side of the Road

[Jamessims]

Was driving along and the radio started tripping out and fading in and out then we lost all the gauges and all the dash lights where coming on and the excursion started to speed up on its own. We finally here able to stop and now nothing is working and the truck will not start. After a whole now it cranks but will not start. I think it is the computer not sure any help or input will be greatly appreciated ! Thanks


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[NoRalPh]

First, do you get a WTS light when you first roll-on the key? (a sign the computer is running)

Next - What yr is your truck?

[Jamessims]

2000 excursion yes the WTS does come on when u roll the key. Also a few weeks back the battery light would flicker ever so often... Maybe alternator the batteries are new


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[NoRalPh]

So, it's still cranking fast enough (won't even try to start once you notice it's cranking slower)

You Tube

You Tube

My usual No Start -

Do you see cranking rpm on the Tach? Do you have a spare CPS to try?

Is there fuel in the fuel bowl now? Does it refill after cranking? (open the drain level to check)

Could the fuel gauge be giving a bad reading? (Below 1/4 tank?)

You can unplug the ICP sensor, as a Test, so the PCM sets a default value for the IPR to run on.

Did you check the plug and sheet metal nut going to the IPR? That nut can vibrate off and allow the solenoid going over the valve to slide around. The wires going to the IPR can get brittle, crack, and short together. Make sure the plug & wires look in good shape.

[Jamessims]

It was the alternator


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[NoRalPh]

So, you got it going.... Great!