Throttle throw relearn? - Mustang Evolution

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Old 05-11-2014, 12:01 AM   #1
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Throttle throw relearn?

I added a stiff little spring behind the pedal, on the cable, to lift it up and allow it to pull the throttle open fully....Most people know about this adjustment.

However, my OBD scanner reads that my throttle is only at 92% when I have it floored.

I have searched and found bits and pieces about a throttle relearn procedure, but there are several minor differences in each one I find.

The basic idea:
1. Disconnect battery for at least 20 minutes
2. reconnect battery.
3. Turn key to accessory position (before it engages the starter)
4. slowly depress pedal from idle to WOT spanning a duration of 5 seconds
5. slowly release pedal from WOT to idle spanning a duration of 5 seconds
6. start car

Is this for real?

The different sources Ive found have minor differences about the time it takes to complete the procedure, and sometimes include a wait period from key switch to pedal action.

Does anyone have a definitive procedure for this? and will it allow my throttle to read 100% on my scanner if performed properly?
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Old 05-11-2014, 03:07 PM   #2
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This is very interesting. I've never heard of a "throttle throw relearn" procedure but, then again, I'm no expert on such things...
I HAVE heard of people drilling, or filing slots in the mounting holes so that they can "clock" the TPS to get it in the right range.
Here's what I would do as an experiment; Remove the TPS from the throttle body and, with it connected, rotate the TPS through it's entire range of movement and see what it reads, particularly, at wide open. Maybe the TPS never reads 100%?
You can also check the TPS with a Multimeter.
I suppose that another thing that you could try is to back off the screws on the TPS and see if you can rotate it backwards from the direction that the throttle opens. There may be enough play to move it around a little.
Haha. Now you have me wondering what mine reads!
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Old 05-11-2014, 05:44 PM   #3
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my car used to read:

ABSLT TPS% 19.2 Idle (92.6 at WOT) on my Actron scanner

After changing the TPS and adding the cable spacer, I still got 19.2 at idle, but a 92.9 at WOT.. a whopping 0.3 percent increase.

I think I will play around with the TPS and my scanner to see it it will actually reach 100%

I've read alot of conflicting info about "setting" the TPS and whether it actually provides real improvements...so much so, that I decided it was just a pointless experiment.

However, after watching several Youtube videos of supposed stock Edge GTs running sub 6 sec 0-60 runs, I am thinking that this low WOT percentage may be part of my cars sluggish 0-60 runs of mid 7 seconds.
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Old 05-12-2014, 10:23 AM   #4
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Quote:
Originally Posted by straybullitt View Post
Here's what I would do as an experiment; Remove the TPS from the throttle body and, with it connected, rotate the TPS through it's entire range of movement and see what it reads, particularly, at wide open. Maybe the TPS never reads 100%?
ok. I have 2 TPSsensors. the one that was one the car when I bought it, and a new one I purchased last week.

I tested them both with the key on, engine off, and my Actron scanner. They both read from 0-92.9% when turned fully by hand and removed from the throttle body (but with plug still attached), and they both read ~19% at idle when placed on the throttle body.

Both TPSs are consistent with each other and read a fully sweeping range of 0%-92.9%

So that must mean that my ECU never reads 100% WOT.

So, there has to be some way to program or "relearn" that parameter.
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Old 05-12-2014, 10:33 AM   #5
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I just tried the relearn procedure as posted above with no success.. still 92.9% WOT.

I also tried a procedure I saw on the F150 forums:

1. Turn key to accessory
2. Slowly push throttle pedal to floor
3. Quickly release pedal.
4. turn key off.
5. repeat 1-4 two more times.

Again no luck...Still 92.9%

Does anyone have any other ideas?
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Old 05-12-2014, 11:13 AM   #6
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Quote:
Originally Posted by jefx View Post
I just tried the relearn procedure as posted above with no success.. still 92.9% WOT.

I also tried a procedure I saw on the F150 forums:

1. Turn key to accessory
2. Slowly push throttle pedal to floor
3. Quickly release pedal.
4. turn key off.
5. repeat 1-4 two more times.

Again no luck...Still 92.9%

Does anyone have any other ideas?

Ive heard about the first relearn procedure that you posted but I think it only works on 05 and up stangs. I don't know for sure though.
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Old 05-12-2014, 11:44 AM   #7
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The TPS signal will never reach 100%, nor is there any need for it to do so--the PCM considers anything more than 75 to 80% to be WOT (that and determining closed throttle is about all the TPS does).

If you examine the TPS and the connecting blade on the TB shaft you will find it to be a rather "sloppy" fit; intentionally so as a mechanical hysteresis to prevent small changes in throttle position from making the TPS signal jump about and confuse the PCM.

What is important is that the throttle valve be fully open when "floored"; the MAF will read the air flow and the PCM will calculate and inject the proper amount of fuel...
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Old 05-12-2014, 12:10 PM   #8
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Thanks cliffyk.

I've been reading the same basic premise around the web on various car forums. I will no longer worry about my 92.9% WOT

What concerned me is that some people report actually having 100% WOT on their TPSensors according to their scanners.. one guy claimed his F150 reads 108%.

Just thought I was leaving some throttle left unexplored.
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