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What will happen if you replace the ECM and don't calibrate the APPS Sensor?
 

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What's so hard about APPS reset?

The below is from someone else and I don't remember who. o_O

APPS Reset Procedure
Answer: This procedure has shown to help 24 valve ISB engines. It is basically teaching the fly by wire accelerator on these trucks to reread the position of the pedal and it's limits. Most complaints this will help with is poor acceleration, improper shifting, bucking in 5 and 6 speeds. Has been known to increase fuel mileage in some instances.

1. Set parking brake
2. Disconnect negative battery cables on both batteries
3. Turn ignition key to run(to drain any remaining capacitors)
4. Let truck sit for 30 minutes( this is the recommended minimum)
5. Return ignition to OFF position
6. Reconnect both batteries and secure, not a timed event
7. Turn key to run position(not start) and depress accelerator pedal slowly all the way to the floor
8. Allow pedal to return to top position slowly
9. Turn ignition switch OFF
10.Release parking brake
 

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That is correct except that you cycle the key three times leaving it on the third time. You could have idle or accelerating issues if you did not do it, by not necessarily. But if you did not do it just do it now. No harm no foul.
 

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You mean before doing the pedal step?
 

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Yes the three times is what is required to trigger the reading and reset of the throttle to the ECM.
 
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