Rod Williams wrote:
> >>Today my '87 Mustang when I shifted gears, with the clutch in, the RPM
> >>actually went up before hitting the next gear. I stopped at a
> >>stop sign and at a dead stop the RPM went up to 2200 and wouldn't come
> >>down. Stopped at another stop sign, and the same thing. Shut it off,
> >>restarted and it was fine. Any ideas? Did the computer just get dumb or
> >>is this the first sign of a problem?
> > Rod,
> > Sounds to me like you need a new TPS sensor. It's mounted on the top
> > of the throttle body with two small screws. It's really easy to remove
> > and replace, although you'll need a multimeter to adjust the new one.
> > If you want to do it yourself, just ask we'll post instructions.
> I would appreciate the instructions. I have a meter so that is not a
The TPS is located directly on top of the throttle body and is adjusted
by loosening the two phillips mounting screws and swiveling the sensor
until the highest reading is found. It may be necessary to elongate
the holes with a small file to achieve the desired reading (though I've
never had to elongate the holes).
The spec range for Key On/engine not running is from .88 to 1.0 volt;
shoot for the .97 to .99 volt. With the engine running, the voltage
should be no higher than 1.05 volts.
The best way to take a TPS voltage reading is by using two safety pins
through the wires coming from the sensor. The positive lead is
attached to the green wire, while the negative goes to the black wire.
Always ground the meter through the sensor's black wire. This gives a
direct, and more accurate ground into the computer.
Hope this helps.