bad speed signal to ecu?

well my truck is a 99 preruner ext cab with the e-3rz in it and an automatic transmission. it has a body lift of about 2-2.5 inches with 31x10.5 tires on it.

my issue is that my speedometer is off by +20 mph. and the truck can not keep up on the freeway with other cars. it has to be literally floored to just enter the freeway at a safe enough speed. and up here in the av with 70mph speed limits on the freeway my car tops out at 80 due to the governor. and if you know this valley the constant 30mph winds on the freeway makes it even worse to maintain that speed in this truck


it feels to me as if the tranny does not hold the gears long enough it will shift too soon (right at 3k)and the next gear up will require me to floor it just to maintain an acceleration than as it picks up speed it will shift again causing me to again, press the pedal to the floor. than once i'm up to 70 it cruses at 3/4 throttle.

the throttle response at at cruising speed is horrible i can rock the gas pedal hearing the engine only slightly rev and i get nothing.

i use the o.d button to pass cars or sometime to get on the freeway if i don't want to floor it.

i do not know exactly why the spedo is off. i need to hook up a code reader i believe and see if its putting out a correct speed to see if its actually the speed signal or the cluster.

and if it is a bad speed signal would it be the reason for my poor preformance issue or is that actually how a 4 banger taco drives on 31's with a body lift?

thanks in advance for all your help

 

have you by chance checked the butterfly in the throttle body to see how far its opening? kinda sounds like it may not be opening all the way. get someone to push the gas pedal in while you look at it.

 

nope i haven't even thought of checking that. i will get my hanes out and see if i cant get to it and see. how much should it be opening than?

 

Under wot....butterfly should be 3/4 to fully open I believe. If its not....need to clean the tb and adjust the cable.

 

i was imagining checking this with the engine running but i just realized i should probably just do it with it off. would that be sufficient?

 

Yeah........don't see a problem checking it not running.

 

ill check this in the morning but i have to say i am really skeptical on this because of the fact that my engine is screaming still when im trying to accelerate it feels to like its all in the shifting. but iv been wrong plenty of times before lol

 

Quite a few things it could be man. Is there any cel at all coming on?

 

cel? what do you mean?

 

Check engine light

 

oh my bad, nope no check engine light