good evening
I would like to know in which position the tps mounts please?
Because some say the beam is mounted upwards towards the iac and mine and in the other direction, the beam towards the engine.
For the values ​​I am 0.93v with the beam to iat and 0.88 beam to the motor like the photo.

 

Should I leave it like that or put it back like several people?
it doesn't look like it was taken apart yet.

 

This is the page from the 1996 FSM. I don’t know what you are working on.. I’m assuming ‘beam is mounted upwards’ you mean pigtail?

 

I'm working on a 1993 f150 5.0 302.

the pigtail you are talking about is the start of the beam?

 

Your TPS looks fine to me.

A photo from a very good write-up for TPS R&R:


Throttle Position Sensor Testing, Replacement

Good photos and info in that thread. I completely disagree with adjusting the TPS to some magical number at closed throttle. Anything between 0.6 to 1.0 VDC closed throttle is perfectly fine.

 

thank you so much, i'll leave it as it is then.
with this position the idle is not the same as in the other direction.

the other way slows it down and lower and when i unplug the iac the motor stalls while the other way slows it down but doesn't stall.

 

The important part is that the tabs of the sensor engage the tabs on the throttle shaft and that the sensor turns with the throttle.

 

ok, but it seemed weird to me that some f150s are positioned differently.
and that mine changes behavior depending on the position.

 

If in doubt measure the actual TPS output voltage.

The idle RPM should be very low or the motor stalls when the IAC is disconnected. That is normal operation.

 

In the position as in the photo, the Ford slows down more and the engine speed does not drop immediately, I am at 0.88v at idle (engine off with ignition on) and 4.62 open.

in the beam position towards the IAT the engine has a low slowdown when disconnecting the IAT when hot. the Ford seems to have more response but seems to vibrate when I stabilize the accelerator with throttle stick off.

I am at 093v slows down and 4.62 open.


since it's test I haven't ridden with it to see.
the iat is new.


I wanted to know if it was touched by the previous owner or is it normal.

what you called pigtail? the beginning of the beams?

 

IAC = Idle Air Controller


IAT = Intake Air Temperature sensor


Two very different devices referred to on this thread.


To be honest I am completely at a loss when you are asking about "beam". Your TPS output signal appears to be well within range for closed throttle and open throttle. Any differences in perceived operation may be caused by slight differences in the actual TPS resistance and the curve it has. Curve meaning the rate the resistance changes from closed to open. An original TPS on a vehicle this old is suspect to me due to age. A replacement TPS has it's own issues related to aftermarket part quality or lack thereof versus OEM. Even the Motorcraft version is showing signs of declining quality control.

 

sorry I spoke of the IAC I was wrong.

as for the sensor, I just wanted to know the original position to know if it was correctly installed.

in the manual it says to put the pigtail towards the IAC and mine went up the other way, that's why I asked the question.

 

here is the other assembly of the tps, when you spoke about the pigtail it is sui is surrounded in verse?

 

We posted two different examples of how the TPS is mounted. One from an actual TPS mounted on the throttlebody and another a diagram from a Ford service manual. The picture I sent from the write-up does show the TPS mounted with the connector pointed away from the IAC. In a later photo of the write-up the TPS is mounted as described in the diagram from the Ford Service Manual documentation. The throttlebody shaft axis of rotation is going to be the same regardless if the TPS is mounted pointing away from the IAC versus towards the IAC. The main concern is the TPS may be rotated a little more or a little less internally with the throttle closed. The result may be a slightly higher or lower output based on which way the TPS is mounted.

In situations like this I tend to follow the Ford documentation regardless of how you may have found the original part.

On my old 1992 F350 w/5.8L engine the EGR Valve Regulator (EVR) was mounted opposite of every photo I found. I was hearing a low frequency rumbling noise whenever I shut the truck off. The rumbling lasted for a few seconds. I found it annoying so I traced it down to the EVR. According to the photos the intake cap/filter was supposed to be in the upright position, mine was at the bottom on the bracket. Everything looked original so I inverted the EVR to match the photos. That rumbling noise, actually sounded like a dying goose, went away. Another one of those scenarios where mounting something opposite should have zero effect on operation, but there was obviously something amiss.

Others may have different opinions and experience on the TPS mounting orientation. But based on your TPS output measurements there was very little change in output voltage at both ends. That could very easily be attributed to slightly difference resistance.

The main take away here is to be sure to engage the TPS on the throttlebody shaft "tang" then rotate the TPS slightly to line up the mounting holes.

 

great thanks for the explanation. so I'm going to reassemble my tps like the ford manual then, towards the iac.
thanks again