How do i adjust my tps?

 

you dont.

 

HI!... Hook a volt meter to the center wire of the 3 wires going to the TPS plug. Turn your key ON forward but engine OFF. With the trottle at ZERO (foot of gas pedal) you should read somewhere around 0.80-0.99 volts. This varies on all trucks. Mine was set at 0.84 volts from the factory. Now to adjust the voltage, simply loosen the two screws that hold the TPS to the TB. Then twist the TPS up or down. You want the TPS voltage to go up, not down. Your perfect voltage is around 0.98 - 0.99 volts.Do not go over 0.99 volts or you can have idle surging. This mod just gives you better throttle responce (very slightly). If you can't get close to 0.99 volts by twisting the TPS then in some cases you have to remove the TPS sensor from the TB and drill the screw holes larger to get the needed room.

 

What year truck and engine?

The TPS is a basic potentiometer (an electronic component that is used to vary, or control, the amount of current that flows through an electronic circuit). I'm not filmilar with Ford TPS's, but I have had a great deal of work on these with my Corvette's.

You will need to know what the voltage should be at closed throttle and what it should be at WOT. I know that the older TPS's are adjustable where the new ones are not. Anytime the thottle blades are moved it causes a change in TPS voltage which the ECM/PCM uses to control fuel delivery, timing, ect. If the voltage is set incorrectly, it will cause drivability problems. Too little voltage will cause a sluggish throttle response and low idle. Too high voltage will cause a high idle and poor drivability...the ECM/PCM thinks the throttle blades are open more than they really are.

Example: MY TPS voltage on my 86 vette is set at .54v at closed throttle and it increases smoothly as the throttle blades are slowly opened. At WOT MY voltage is 4.27v. This is normal with my vehicle and more than likely will not be the same with yours. If these trucks have a minimal idle screw on the throttle body....anytime it is moved it will change the voltage reading given to the ECM/PCM and will need to be adjusted.

 

The TPS has been NON-adjustable since the late 80s/early 90s. The holes aren't slotted so it can't be turned, and the PCM is programmed to 'learn' the TPS readings over a fairly wide range.



If your TPS is out-of-range, it's either bad, or someone has messed with the throttle stop screw. This is a 5.0L/5.8L:

 

There is still enough play in the holes that you can get some adjustment by tweaking it. Whether or not it makes a difference is another issue.

 

Not true, but not a flame either...
TPS's can be adjusted as Neal explained. I have done numerous F-150's and Lightnings for several people including myself....

 

non adjustable..

 

Not true.

 

WRONG!!!!!!!

 

http://autorepair.about.com/library/a/1d/bl091d.htm

Now, you've replaced the TPS, but did you adjust it after you put it in? There are two types of TPS used on this engine, an adjustable and a non-adjustable type. There's a picture below. If your's is the adjustable type, and I'm almost certain it is, then you will need to have a Ford Dealer adjust it for you.

 

There is something none of you know about so far.
The EEC/PCM are auto zeroing.
This starts when the ignition is first turned on.
As long as the voltage is within the 3% tolerence the ECM auto zero references it's table to what ever it finds.
Reason is the normal wear and temp differnces over a long term make this much less a maintaince issue.

 

"None"?

The PCM will accept any LOWER reading instantly at startup as the new minimum, but it takes SEVERAL drive cycles to learn a HIGHER reading as the minimum (throttle stop). It will learn a lower reading while driving after a certain time at that reading.