I stole this procedure from one of BB's post, so if they need to be critiqued, feel free to do so.

Last week while bnold and bigblue were installing my high idle box, they also recalibriated my APPS. This really woke my truck up.

My truck was not running bad at all, but this made such a difference I though I would bump it back to the top.

Maybe this needs to be listed in the Tech Facts.

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Tools: Digital Volt Meter, T-20 Torx bit, #1 phillips, 10mm socket

With the key on, engine off you need to probe the APPS wire to see where the voltage is currently set at.
The best location to probe the wire is on the PCM (Power Control Module) which is located on the passenger firewall behind the air intake.

• You want the C1 connector, this is the connector closest to the engine

• You want the orange wire with a dark blue tracer which is pin #23

• Voltage should be somewhere around 0.5 volts,

• At this point the voltage reading does not matter, it just has to be accurately written down for later reference

TURN THE IGNITION OFF ON THE TRUCK

Remove the black plastic cover off of your APPS. There are two plastic screws. One on the top and one on the front facing the radiator. It takes a little prying to pull it off.

Undo the 6-10mm bolts that hold the bracketru in place but DO NOT REMOVE THE CABLES!!

You will notice the APPS is on the back of the bracketry that you just removed, it is held in place by 2-T20 torx bit screws. These screws have a little bit of locktite on them so make sure you have a good socket and gently give a little tap with a hammer before attempting to loosen. Be very careful because these screws strip VERY easily and you only get one shot at them (VERY VERY VERY IMPORTANT; They are VERY tight).

• On the APPS you will find a white tag that gives you the information on what the APPS voltage should be.

• After loosening the screws (do not remove) you can rotate the APPS clockwise or counter clockwise to get the adjustment (towards the front of the truck increases voltage and towards the rear of the truck decreases voltage)

• The reading you took at the beginning of the process on pin #23 should match the white tag on your APPS. If it doesn't then adjust accordingly.

 

Sounds like a weekend project for me.