Quote:
Originally Posted by Boog
Someone mentioned it might be a worn tps. Since the computer uses tps to select proper gear selection for load/throttle requirements it does sound plausible. I have reason to believe my tps is original and on some occasions it seems like it should have downshifted on a passing maneuver requiring a good bit more accelerator but didn't.
I've had the truck going on 3 yrs and have only replaced the iac and fpr so far.
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A "PCM reflash" at the dealer might cure this, Ive had this fix alot of 99-00 trucks with shifting problems.
An intermittent VSS signal can cause the PCM to command second gear.
Debris on top of the spacer plate or in the valve body or a leaking shift solenoid can cause a 4L60E to start in a gear higher than first.