Quote:
Originally Posted by LS1-450  Check to make sure that the TB plate is all the way open during WOT. Sometimes the cable is not adjusted properly & the TB does not fully open when the gas pedal is all the way down on the floor (WOT). |
Exactly, check this first.
Now if the throttle blade is all the way open and hitting the bumpstop and you're still only getting 4.15V, then you'll need to do the throttle stop mod. Basically you gradually grind away at the throttle bump stop on the side of the throttle body until you get exactly 4.5V.