High Altitude Emmissions

[nkrax]

The invoice on my 98 XLT 4x4 SOHC v6 says that i have the option "high altitude package" or something to that effect. Does anyone know what is different about an explorer that has this option?

thanks,
nate

 

[Alec]

The computer may have a slightly different program to deal with less air pressure and oxygen content, and also lower octane gas. Sometimes when I go on a road trip I reset the computer if it runs rough after a very quick change in elevation (if I have time) of a few thousand feet.

This is just a guess.

 

[410Fortune]

YES THAT IS RIGHT, IT is a different spark/fuel curve for high altitude.

The altitude changes can reak havok on your computer.
I stillget a CEL (02 lean) sometimes in the rockies, basically anytime I either scream up a long hill climb or let the compression braking hold me back on a long decent (Eisenhouer Tunnel, or Floyd Hill) the CEL wil come on and then go off in a few minutes......the EEC just cant keep up with the 2000ft altitude changes...

To make up for it Ford made a high altitude package, or a computer just like Alec said with a slightly different program........

 

[MrShorty]

for the sake of information, do you know how to tell (from a calibration code or something) if you have the high altitude package? What is considered high altitude?

 

[410Fortune]

no idea, I am guessing it would be in the computer code, on the EEC itself....