TB install-TPS Adjustment....

[gonzo50]

I purchased the Accufab TB from the first group buy Todd set up, my questions are;:help: If the Throttle Position Sensor(TPS) needs to be adjusted, how do I go about doing this ?
Is it complicated or simple ?
What tools do I need, ie: voltage meter ?
Do all the TB's have to be adjusted ?
What am I looking for in the reading of voltage ?

Also, do the bolts on the TB have a specific torque #no. to tighten down on installation, if so, what is it ?:dunno:

Before taking the old TB off, does the battery have to be disconnected or can it be taken off with the battery connected ?:confused:

Sorry for the long drawn out questions, Thanks for the knowledge.:thinker:

[Blackened300a]

Todd Posted these instruction in the Group buy thread:

To adjust the TPS, please refer to the following:
Disconnect the ground cable from the battery.
Remove the TPS from the original throttle body and install it on the new Accufab throttle body. If new screws have been provided in the package from Accufab, use these screws (they are shorter). If not, reuse the original or stock screws.
Reconnect the TPS to the wire harness.
Reconnect the battery.
Now, the TPS needs to be adjusted to achieve the correct voltage at idle. Changes to the idle speed can ONLY be made by adjusting the TPS.
DO NOT ADJUST THE STOP SCREW ON THE THROTTLE BODY UNDER ANY CIRCUMSTANCES. This screw has been pre-set at the factory to insure a proper air gap around the throttle blade in the fully closed position. If by chance this stop screw has been adjusted in the field, please call our TechLine for further assistance.
The TPS is connected to the main wire harness with three separate, color coded wires:

Gray & Red
Gray & White
Brown & White The gray & red wire is the ground wire (could also be a black wire).
The gray & white wire provides the voltage information to the ECM (could also be a green wire).
The brown & white wire provides a 5-volt reference signal WITH THE KEY ON (could also be an orange wire).
If you have any problems identifying the different colors or if the wires are different colors from those described, check inside the plastic quick disconnect plug. The plug connection tangs should have an “A”, “B”, and “C” next to each tang.
A = gray & red wire
B = gray & white wire
C = brown & white wire
Because of the different suppliers of TPS’s, and the potential for different wire colors, you may need to “poke around” on the wires in order to determine the positive and negative leads. An easy way to take voltage readings is to stick a safety pin through the individual wires, and then make contact with your Volt Meter probes to the safety pins.
To check voltage, THE IGNITION KEY NEEDS TO BE IN THE ON POSITION BUT THE ENGINE MUST NOT BE RUNNING. With the positive (+) lead from your voltmeter, pierce the gray & white wire. With the negative (-) lead from your voltmeter, pierce the gray and red wire. The voltmeter should read no less than .98 volts nor more than 1.0 volts. If the voltage is too high, loosen, but do not remove, the two screws holding the TPS to the throttle body, and rotate the unit counter-clockwise, until the voltage is correct. Rotating the unit clockwise will increase the corresponding voltage. When the voltage is correct, retighten the two screws. The only adjustment is the “slop” between the inside diameter of the holes and the outside diameter of the screws, so we are dealing with just a few degrees of rotation.
The Ford ECM’s are very unforgiving when it comes to ANY engine modifications from stock. The addition of an Accufab throttle body should not have any negative effect on idle speed, off-idle performance (tip-in) or the RPM returning to idle speed, within a second or two, when the throttle is closed.
If on the other hand, modifications to the stock engine include additional supercharger boost with the use of different supercharger pulleys (particularly noticeable on supercharged 2003-2004 Mustang Cobra’s) or adding a “re-programming” chip or add-on computer module, the standard TPS voltage readings and other drivability issues may be noticeable, and could include an overly fast idle and a resistance of the ECM to “allow” the throttle to close properly, resulting in a delay between removing your foot from the gas pedal and the engine returning to idle.
These are not throttle body problems. The throttle body is a mechanical device with only one moving part. As long as the throttle body slams shut when you close the throttle (key off, engine not running), the throttle body is functioning correctly. Any other problem is associated with the ECM and the feedback it is receiving, either due to the increased boost at idle (more air supply) or the add-on computer chip sending incorrect (or unknown) data to the ECM. <!-- / message -->

[Fourth Horseman]

I posted this in the group buy thread, but thought I'd meniton it here as well in case it helps you. On my throttle position sensor (TPS) I could never rotate it enough to get the voltage within spec (.98 to 1.00 volt). I ended up taking it off and drilling out the metal sleeves that are in the screw holes. This gave me the slack to rotate the sensor sufficiently to get it to .995, right on the money.

It sounds like most people haven't had to remove the metal sleeves, though, so definitely try it first before taking this step.

Also, for the TB bolts, the book says 9nm (80 in-lbs). And I did disconnect the battery so that the computer would have to relearn everything. I think this is a good step any time you alter the air intake path.

[gonzo50]

Todd Posted these instruction in the Group buy thread:

To adjust the TPS, please refer to the following:
<!-- / message -->
I don't know how I could have missed this, but I did.:dunno:
Thanks for the Instructions again.

Also, for the TB bolts, the book says 9nm (80 in-lbs). And I did disconnect the battery so that the computer would have to relearn everything. I think this is a good step any time you alter the air intake path.
Thanks for the "in/lbs" specification.
Wish I had that "Big Red Book" you have, comes in handy for the do-it-yourselfer......:2thumbs: