adjust your TPS (another free hp mod)

[03_LTD]

I did this tweak yesterday! Before the tweak the voltage reading was .987V, after it was .958V! The idle sure seems to be smoother than before!

99-5.0explorer,

I don't recall which two wires I tested, but all the other combinations I tried were way over a fraction of a volt! Once I got a reading of .9 somthing, I figured I had the right combination! I'm pretty sure it was taken between the two grey wires, and the red lead was probably connected to the grey and red wire. I didn't have to even remove the TPS, just wiggled it till I got a reading as close to .960V as I could and then tightened down the screws. It's a pain the butt on the 03 because the TPS is on the back side of the TB and there's not much room to manuvere. I used an off set phillips screwdriver. I took a couple of the wife's sewing needles and slid them into the back of the connector till they touched the metal, then attached the volt metter using alligator clips. The freed up my hands to adjust the TPS and tighten the screws while making sure the voltage stayed on mark! Good luck!

 

[DazedNConfuzed]

Just FYI, anything past .99 tells your computer that its no longer at idle anymore. You should get a full 5.0 volts at WOT, if not replace the TPS. They are cheap and known to go bad.
Dazed

 

[J. Kennedy]

Help. One wire reads 1.78, on wire reads 0.00 and another wire reads 0.46. Turning the TPS does not change any readings! I even pulled the TPS out and turned it with a screwdiver, and it did not change any readings. They stayed steady. I even put on a spare TPS (left over from my bad transmision experience) and got the exact same readings!

What am I doing wrong? It seems these readings should at least move.

 

[J. Kennedy]

Help. One wire reads 1.78, on wire reads 0.00 and another wire reads 0.46. Turning the TPS does not change any readings! I even pulled the TPS out and turned it with a screwdiver, and it did not change any readings. They stayed steady. I even put on a spare TPS (left over from my bad transmision experience) and got the exact same readings!

What am I doing wrong? It seems these readings should at least move.

When I wiggle the positive lead, the fuse box next to the master cylinder goes "click click clickiddy click". an I get a buzzing that sounds like it is below the master cylinder.

 

[Kamaaina]

Ground one lead of your voltmeter and probe the wires until you get one wire that has voltage between .8 to 1.2........that's the wire. Voltage should increase as you open the throttle body linkage.

 

[J. Kennedy]

Not working. I have tried grounding to the ground strap, the batt, and the middle (Ground) wire of the harness. Readings are consistent: 1st wire read 1.78, middle wire reads 0.00, third wire reads 0.46. Turning the TPS does not change this. Opening the butterfly valve does not change this.

If anyone has a positive answer as to what is going on I would appreciate it.

 

[Funmobile]

J. Kennedy,
If your getting the same reading no matter what you are doing, then you need to explain what you are doing. Use a digital VOM and conect one lead to the middle wire and the other lead to one of the other two wires. You have a 50/50 chance of picking the right one. You want to one the reads low .8-1.2v. You don't want to connect it to ground. Your measuring voltage on the TPS, not to ground. If you have hooked it properly check to see if the readings change when you open the throttle. You may have to go back to the begining of this thread and read it over again. I have links on how to do this with pics.
RE-read
Hit print
Do over

 

[J. Kennedy]

Here is what I'm doing: ground lead to middle (ground wire), or to alternate ground locations, as mentioned in this thread by other users. One of the wires reads 1.78, the other reads 0.46, no matter where I am grounded. If you RE-read my post, you will see that neither wire reads between .8-1.2, be it to ground or the TPS. As I mentioned before, the readings dont change when I open the throttle.

I have read this, seen the pics, and done over & over again. I always did better than average in Reading Comprehension. I am posting here in the hopes that someone knows why I am getting these bogus readings.

 

[Funmobile]

Are you disconnecting the connector from the TPS and hooking up? Everything stays connected. How are you making contact with the terminals in the TPS connector? If they aren't fully contacted then you will get a bogus reading. Both of the leads from the meter should be connected to the wires from the TPS, not to groud. I can't tell you wire colors to use because different years and different models use different colors.

 

[Opera House]

Have you checked the meter lately? Do you have that little battey symbol on? Try it on a good "D" battery and see if you get about 1 1/2 volts. Your readings sound strangly divided by two. Stuff happens. I left my good meter at a friends house and then he did some TIG welding on the same bench. Never read right after that. He later did the same thing to his own meter.

 

[james t]

I agree, something's not right. Test the meter. If possible, borrow one from someone else.

 

[DS_Monsoon]

J. Kennedy, if you're still working on this, just a thought but is the meter set to DC?

 

[DMan446]

I did the TPS and the TC adjustments today (5/15/04). I took before and after readings on the TPS. Before was set at 1.014 and after I adjusted it, it fluctuated between .959 and .960. Coudn't hope for more than that.

Also I noticed that mine wasnt really off that much, so I didn't notch the holes in it. I just used a drill bit slightly bigger than the factory hole and drilled the hole a little bigger. Gave me enough play either way to adjust it. Mine was so sensitive, if it moved a hair either way it would go way off.

Thankx all

 

[V8BoatBuilder]

Is 0.96V the ideal setting?

Why is 0.96v the ideal setting for the TPS?

I hooked up my OBD-2 scanner and did some playing around: when the computer is receiving 0.96v (I get the exact value on scanner, through the OBD2 Port), the PCM thinks the throttle plate is open 18.8%.

When the TPS is putting out 0.63v, the PCM thinks the throttle plate is open 12.5%.

When the TPS is disconnected, and the PCM is receiving back 0.0 volts, then it thinks the throttle plate is closed. These conversions from sensor voltage %open are from the PCM directly, and have nothing to do with the sensor itself.

What gives? What's magical about 18.8% to the PCM?

-Aaron

 

[james t]

Running it around that voltage will give you very close to an ideal "power" A/F ratio at idle. Its just rich enough to give a smooth idle with good off-idle response, but not so rich that the motor will bog and/or have a lumpy idle. As far as the throttle open % conversion, i have no idea. It just works.

 

[Funmobile]

V8BoatBuilder,
You can do .96vDC or .98vDC. The second number would give you a better "Feel" about driving it. You DO NOT WANT to be over 1vDC. Anything over 1vDC will put the ECM into a default program, no performance and no economy.
It does not change your A/F ratio. The TPS is a reference point for the computer to tell when you are at wide open throttle(WOT). When you reach a point where the ECM thinks your at WOT, the ECM will make adjustments such as; 1) turning off the AC compressor, 2) turning off the field for the alternator, 3) downshifts the transmission, 4) the injectors will go to full pulse width.

This MOD does NOT give you any extra HP! It re-assigns what was being used on accessories to drive the vehicle.

 

[bates]

I tested that and got 4.46 volts... Seems high to me.

 

[Jason94sport]

I'm confused?

I tried to follow the directions. I have a few questions:

Do I need to unplug the TPS connector when doing this?
How do I test the wires? Do they need to be cut so I can get the tester leads onto them?
How do I connect the teaster leads to the TPS wires?

I tried sticking the leads into the holes where the wires are, & couln't get any readings. I know the tester is good I tested that with a battery.

 

[WillieTD]

Your multimeter should have a sharp point on the probe. You stick that into the wires leading to the TPS.

Personally, I found this "mod" to be a complete waste of time. Not only won't it work on my model, which has the metal sleeve and is impossible to drill through without breaking the TPS, but for $30, you can buy a new TPS and not have to worry about it at all.

But that's just me.

 

[Rhett]

Metal sleeve? It should be wires, with rubber coating...
Are the Euro Explorers different?