Slight RPM Surge at 47 MPH
12-12-2012, 08:15 PM
#41
Mine pulls 1,500rpm easily in 5th gear without any of this surging.
It could be the TCC not being able to make up it's mind to lock or unlock. Sounds more like a programming error than anything else.
There's a threshold where the TCC is supposed to lock. Some are programmed to only lock when you're above say 10% (a guess) throttle. You may be right on the edge of this threshold. All of them unlock when you let off the gas and most unlock when you're at WOT.
Either way, 50-100rpm difference under light throttle sounds about right for the TCC to be locking/unlocking.
It could be the TCC not being able to make up it's mind to lock or unlock. Sounds more like a programming error than anything else.
There's a threshold where the TCC is supposed to lock. Some are programmed to only lock when you're above say 10% (a guess) throttle. You may be right on the edge of this threshold. All of them unlock when you let off the gas and most unlock when you're at WOT.
Either way, 50-100rpm difference under light throttle sounds about right for the TCC to be locking/unlocking.
mine did that when i first tried to hypermile.
then after few hundred miles of locking-unlocking between 45-50mph, car decided it's safe to lock and now it's in lock 5th past 45mph all the time.
and zero gas pedal = 12% throttle according to OBD2.
it stays locked until rpm reaches 1000 then it blips around. and once i apply steady 15-17% throttle(per OBD2) it locks at whatever speed i'm going.
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