Specifications

Upper Control Arm Bushing Problem
It's a known fact that the passenger-side, upper control arm bushings deteriorate much quicker than the
driver-side. This is due to the offset of the engine in the engine bay. The heat from the factory manifold
causes the rubber to deteriorate prematurely...not because of headers as some dealerships claim. (It
happens to both factory manifolds and headers...even Mopar headers.)
There is a TSB (Technical Service Bulletin) on this from 1997-2000 vehicles (Dakota/Durango).
Upper Control Arm Bushing TSB - MS Word
Upper Control Arm Bushing TSB - Adobe PDF
TPS Modification:
(Applies to '92 -Current models)
Have you ever noticed that slight stumble right off idle when you mash the pedal to the floor? Here's an
easy fix for the sluggish response of the throttle (which is related to the TPS Sensor).
Here's a chart that shows the change in the Absolute TPS% that the PCM sees
TPS Voltage Absolute TPS%
.44v 7.9%
.53v 10.1%
.685v 12.5%
.75v 13.7%
.82v 15.3%
Check your TPS voltage before doing this modification as none of the factory sensors are calibrated the
same. We've seen ranges from .3v-.7v...from the factory. Connect a Digital Volt Meter to the middle
terminal on the TPS sensor (with the harness connected and the Key-ON/Engine-OFF). If it's close to
.7v...leave it alone.
(1) Remove your TPS Sensor from the vehicle (Located on the drivers side of the throttle body - 3-Wire
Connector)
(2) Put the TPS into a vice and drill the two brass inserts out of the casing with a 1/4" or 7/32" drill bit (drill
from the back of the sensor...not the front). You'll need to push on the drill as it will only spin the
inserts...once they're heated up enough, they'll pop right out.
(3) Clean up the holes with either the drill or (preferred) a small round file.
(4) Reinstall the TPS Sensor on the throttle body. You'll need two small washers on the screws as the holes
are now bigger than the screw head. Leave it slightly loose as you're going to have to set the initial Key
ON/Engine OFF Voltage before starting the engine.
(5) Reconnect the TPS sensor harness and connect a Digital Volt Meter to the middle terminal on the TPS
Sensor (you can poke through the weather-proof connector).
(6) Turn the ignition key ON but do NOT start the engine.
(7) Set the initial voltage (by turning it with your fingers) on the TPS at about .7 volts. (Optimum range is
from .7 - .75 volts)
(8) Tighten down the TPS screws and check the voltage one more time (yes...it can move slightly when
tightening it down)