what is all this talk about setting the tps volatge to .98 or .99 after searching stangnet.com...i have read that setting the tps dosent matter..cuz the computer resets it after startup...that setting it to that level causes the car to run rich an mess up other components..also i have read that after you set the tps voltage you must clear the computer...by taking off the positive and negative posts...and leaveing a door open, or pumping the brakes three times..or turning on the head lights...why do this????...isnt disconnecting the battery enought..is any of this true...i am working on smoothing my idle out...tommorow iam going to take off my egr valve and clean it out with throttle body cleaner..any tips or basic step by step doing this...i dont have cats will this cause the egr valve to be dirty..and after i clean the egr valve iam going to set the tps voltage to .95 to .96...who agrees or disagrees with me??????????leave your two cents
The Mother Of All Tps Threads
- Thread starter ja1919
- Start date
turning on a draw of any sort (headlights, brake lights, etc) discharges the KAM - so its memory is completely erased.ja1919 said:
this might be helpful with the cleaning and resetting of idle stuff:
http://www.muscularmustangs.com/iac.html
i also dont buy into the resetting of the TPS, but here is why i dont disagree with people who do it:
yeah, on paper it should zero out. but on paper, i doubt the car was engineered to have idle surge and other idle issues. so if playing with the TPS helps some folks, i say go for it. it is free.
so yeah, go ahead and set your tps - the values you listed sound great. good luck.
it depends upon the car and the settings right now. a lot of folks also say they notice stuff like sidegapping plugs on a stock motor. i dont. it takes a good 15-25 hp for me to notice. i would say that if you end up with a hanging idle (which you should not with a setting of <0.97 volts), you can further dial it in.ja1919 said:
additionally, a vac leak can create a hanging idle. while rolling the car will intentionally create a hanging idle to help with not stalling.
http://www.duggerracing.com/techtips/tps.shtml
How to set your throttle position sensor
The throttle position sensor (TPS) is a potentiometer that is locaed on the throttle body located directly on top of the throttle plate. This sensor tells the EEC how wide open the throttle plate is. A misadjusted or malufunctioning TPS can cause a hunting idle, bucking, surging and/or overall poor performance.
To adjust your TPS for proper voltage, use the following steps as a guideline. I will be using the 86-93 Mustang as a reference, other vehicles may differ slightly.
1. Locate the TPS directly on top of the throttle body. It is held on by two phillips head mounting screws.
2. Using a Digital Voltmeter Ohm Meter (DVOM) check the voltage between the GREEN (+) and BLACK(-) wires coming from the sensor itself. Check should be made with the Key On Engine Off (KOEO) mode.
3. Voltage spec at KOEO should be between .95 and .97v. If your reading is out of that range, you must adjust the sensor voltage.
4. Sensor voltage can be adjusted by loosening the two phillips screws that locate the TPS to the throttle body. Rotating the sensor clockwise will increase sensor voltage. Subsequently, rotating the sensor counter clockwise will decrease sensor voltage.
* Note: It may be necessary to use a small file or drill to elongate the mounting holes in the sensor to achieve proper voltage.
5) Once you have the voltage within specs, you are all set. Take it for a test drive and see how it feels. It may be necessary to disconnect the negative battery cable for a few minutes to clear any errors from the EEC.
How to set your throttle position sensor
The throttle position sensor (TPS) is a potentiometer that is locaed on the throttle body located directly on top of the throttle plate. This sensor tells the EEC how wide open the throttle plate is. A misadjusted or malufunctioning TPS can cause a hunting idle, bucking, surging and/or overall poor performance.
To adjust your TPS for proper voltage, use the following steps as a guideline. I will be using the 86-93 Mustang as a reference, other vehicles may differ slightly.
1. Locate the TPS directly on top of the throttle body. It is held on by two phillips head mounting screws.
2. Using a Digital Voltmeter Ohm Meter (DVOM) check the voltage between the GREEN (+) and BLACK(-) wires coming from the sensor itself. Check should be made with the Key On Engine Off (KOEO) mode.
3. Voltage spec at KOEO should be between .95 and .97v. If your reading is out of that range, you must adjust the sensor voltage.
4. Sensor voltage can be adjusted by loosening the two phillips screws that locate the TPS to the throttle body. Rotating the sensor clockwise will increase sensor voltage. Subsequently, rotating the sensor counter clockwise will decrease sensor voltage.
* Note: It may be necessary to use a small file or drill to elongate the mounting holes in the sensor to achieve proper voltage.
5) Once you have the voltage within specs, you are all set. Take it for a test drive and see how it feels. It may be necessary to disconnect the negative battery cable for a few minutes to clear any errors from the EEC.
well today i cleaned the egr valve and put a new gasket on the egr...it was pretty dirty...put it back together and started her up...not really a difference...set the tps voltage to .88 and disconnected the battery and left the door open for about a half hour...i didnt take off the tps and make the holes bigger, i had no time...it fired up pretty quick...and ran pretty nice...after i had turned it off and started it back up later to pull it back in the garage...there realy was no difference...and for the hell of it i checked the tps voltage and it read .84 which went down..why is that...is there a vacuum going to the vapor cansiter???
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