i can't get it!!
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Senior Member
Joined: Feb 2000
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From: Toronto, Ontario, Canada
i can't get it!!
I have read up on the tps mod and went out and bought a fairly decent multimeter to messure the voltage and i also have the haynes manual for reference. So i went out today to take a stab at it, took the plug off (it should be the one attached to the throtle body on the right hand side, the lower one of the two?) and i inserted the probes into the top (negative) and bottom (positive) connectors with the multimeter set at 20V. But, i dont get a reading until i set it at 200mV. Which returns a reading of .6. I then put a brick on the gas peddle pressing it all the way to the floor, went back to check the reading, still at .6??????????????
Where am i goin wrong?
Where am i goin wrong?
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Joined: Jun 2001
Posts: 40
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From: Stockbridge, Ga.
Haven't seen the thread your referring to. However could you be mistakenly selecting DC Volts on the meter to read voltage, when you should be measuring resistance (ohms).
Point me to the mod you're doing and I'll try to help.
Point me to the mod you're doing and I'll try to help.
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Senior Member
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From: Toronto, Ontario, Canada
well basically here are two explanations about how to do it, that i found, or you can just do a search on this site for TPS Mod:
1) First remove the plastic cover over the throttle body. ( 3 10mm bolts) Remove the two hoses that go to the throttle body. As you face the front of the motor, the TPS sensor is located on the right hand side of the throttle body and is attached by two phillips head screws. Now with the ignition in the on position, but motor no running, use a digital multi-meter to check the voltage going to the sensor. I use a Craftsman #82029. its about $20. Set it register VDC. The negative of the multi-meter connects to any good ground, and the positive probes the middle wire on the TPS. Read the meter and adjust your voltage. Your target range should be in the .995-.999 area. DO NOT go above .999 or you may encounter idle problems. You adjust the voltage by loosening the screws on the sensor just enough to get some play and while watching the screen on your multi-meter. If you cant get it to go above say .956 like mine, you might have to remove the TPS sensor and enlarge the mounting holes slightly to get a little more play. Don't enlarge to much it only takes a little to get some more adjustment. Once you get the setting you want, tighten it down, and while watching the screen on your multi-meter, move the throttle to wide open once or twice to make sure your setting is correct. Re-assemble everything, and star the engine. I know that on the older mustangs, 95 and down it would pick the cars up about a tenth in the quater mile, all for free. It seems like alot of work I know, but every little bit counts.
2) First thing that you'll need is a GOOD #2 phillips driver. Remove the black bracket that is to the right (looking at the TB from the front ) of the throttle body. You will see a bolt that goes straight down into the intake at the front of this bracket, and a nut that attachs to a horiz. stud at the back of this bracket. Both the bolt and the nut are 10mm, same as the cover you removed. Once you pull this bracket out of the way you'll have no problem getting to the lower screw on the TPS. Their is no need to remove the components on the above mentioned bracket, just push the whole thing out of your way. Then just align your driver squarely with the TPS screws and lean firmly into them. Just make sure it's a good #2 tip, as you said they are tight, good luck.
1) First remove the plastic cover over the throttle body. ( 3 10mm bolts) Remove the two hoses that go to the throttle body. As you face the front of the motor, the TPS sensor is located on the right hand side of the throttle body and is attached by two phillips head screws. Now with the ignition in the on position, but motor no running, use a digital multi-meter to check the voltage going to the sensor. I use a Craftsman #82029. its about $20. Set it register VDC. The negative of the multi-meter connects to any good ground, and the positive probes the middle wire on the TPS. Read the meter and adjust your voltage. Your target range should be in the .995-.999 area. DO NOT go above .999 or you may encounter idle problems. You adjust the voltage by loosening the screws on the sensor just enough to get some play and while watching the screen on your multi-meter. If you cant get it to go above say .956 like mine, you might have to remove the TPS sensor and enlarge the mounting holes slightly to get a little more play. Don't enlarge to much it only takes a little to get some more adjustment. Once you get the setting you want, tighten it down, and while watching the screen on your multi-meter, move the throttle to wide open once or twice to make sure your setting is correct. Re-assemble everything, and star the engine. I know that on the older mustangs, 95 and down it would pick the cars up about a tenth in the quater mile, all for free. It seems like alot of work I know, but every little bit counts.
2) First thing that you'll need is a GOOD #2 phillips driver. Remove the black bracket that is to the right (looking at the TB from the front ) of the throttle body. You will see a bolt that goes straight down into the intake at the front of this bracket, and a nut that attachs to a horiz. stud at the back of this bracket. Both the bolt and the nut are 10mm, same as the cover you removed. Once you pull this bracket out of the way you'll have no problem getting to the lower screw on the TPS. Their is no need to remove the components on the above mentioned bracket, just push the whole thing out of your way. Then just align your driver squarely with the TPS screws and lean firmly into them. Just make sure it's a good #2 tip, as you said they are tight, good luck.
Member
Joined: Jun 2001
Posts: 40
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From: Stockbridge, Ga.
Cool,
Sorry I took so long to get back to you, my computer has been offline for many days now.
Anyway, from your post you mention " I took the plug off ", maybe this is where you are going wrong. If I'm understanding you correctly, you removed the plug and therefore removed the voltage source across the TPS, (which is a potentiometer). Without voltage applied you can only read resistance across a pot. With voltage applied you read the voltage drop across one end of the pot to the wiper.
Leave everything plugged in and try your measurement again. I believe you may get proper results then.
Good luck, Let me know...
Rick
Sorry I took so long to get back to you, my computer has been offline for many days now.
Anyway, from your post you mention " I took the plug off ", maybe this is where you are going wrong. If I'm understanding you correctly, you removed the plug and therefore removed the voltage source across the TPS, (which is a potentiometer). Without voltage applied you can only read resistance across a pot. With voltage applied you read the voltage drop across one end of the pot to the wiper.
Leave everything plugged in and try your measurement again. I believe you may get proper results then.
Good luck, Let me know...
Rick
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Joined: Jun 2001
Posts: 40
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From: Stockbridge, Ga.
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From: Toronto, Ontario, Canada
I am not really quite sure how i could check the voltage with the plug in place. I didnt get a chance to mess around with it this weekend, so i am goin to give it another shot maybe monday night, keep the help comin, as i am still wonderin
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Joined: May 2000
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From: Virginia Beach, VA
You have to probe the wire with the plug in place. On my '95 this is next to impossible.
Also, from the 'Stang sites, many owners claim that the optimium performance settings are in the .85 -.90 range, rather than the desired 1.0 as the book shows. I haven't tried this yet, but might give it a shot the next time I get around to playing with the truck some.
Also, from the 'Stang sites, many owners claim that the optimium performance settings are in the .85 -.90 range, rather than the desired 1.0 as the book shows. I haven't tried this yet, but might give it a shot the next time I get around to playing with the truck some.
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Joined: Jun 2001
Posts: 40
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From: Stockbridge, Ga.
I haven't a clue as to what it does, I'm just trying to help the guy take his measurement.
To that point, with switch off, disconnect plug and insert a very thin multi-stranded piece of wire (with end stripped of insulation) inside the female end of the plug where you wish to measure. Replace plug. Now you should have a little pigtail of wire sticking out of the plug which is connected to the contact inside. Attach one voltmeter to the end sticking out and attach the other end to the engine block for a ground reference. Take your measurements again.
Be careful, don't let the pigtail touch anything but the meter lead. You won't get shocked but you could possibly blow a fuse if it touches chassis.
Don't forget to remove the pigtail when done.
Let me know...
To that point, with switch off, disconnect plug and insert a very thin multi-stranded piece of wire (with end stripped of insulation) inside the female end of the plug where you wish to measure. Replace plug. Now you should have a little pigtail of wire sticking out of the plug which is connected to the contact inside. Attach one voltmeter to the end sticking out and attach the other end to the engine block for a ground reference. Take your measurements again.
Be careful, don't let the pigtail touch anything but the meter lead. You won't get shocked but you could possibly blow a fuse if it touches chassis.
Don't forget to remove the pigtail when done.
Let me know...
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Senior Member
Joined: Feb 2000
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From: Toronto, Ontario, Canada
sounds good, gonna try it as soon as i can. THANX
the tps (or Throtle Position Sensor) is attached to the throttle body of the truck and tells the computer about the position of the throttle. As you push the gas pedal, the voltage raises in the sensors, letting the computer now that you are giving it more fuel. Thus, the further open you tell it from start, hopefully, the better launches and throttle response you can get. I think this is the simplified version of the mod, or atleast what i have been able to gather. If you read back, mustang owners first started this, and supposedly the could gain a tenth in the quarter, if im not mistaken.
Again, thanx for all the help, ill keep tryin
the tps (or Throtle Position Sensor) is attached to the throttle body of the truck and tells the computer about the position of the throttle. As you push the gas pedal, the voltage raises in the sensors, letting the computer now that you are giving it more fuel. Thus, the further open you tell it from start, hopefully, the better launches and throttle response you can get. I think this is the simplified version of the mod, or atleast what i have been able to gather. If you read back, mustang owners first started this, and supposedly the could gain a tenth in the quarter, if im not mistaken.
Again, thanx for all the help, ill keep tryin
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Senior Member
Joined: Feb 2000
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From: Toronto, Ontario, Canada
Finally got it. Thanx to everyone's help. Im kinda a roookie at engines, this being my first vehicle, and me bein 18 and all, oh well, all good!
Ne-ways, i was hesitant originally, but i figured out that i had to probe the back side of the plug, stickin it through the same path as the wires travel.
My tps was already at 0.96 so not to much adjustment was needed, but damn those screws were stubborn, definately affraid of strippin them. Anyways, got it up to 0.995, should be good enough.
Now i have to take some of the slack out of my throttle cable cause when i put a brick on the peddle i got up to about 3.5 but when i did the TB by hand i got closer to 5, so that is definately my next project.
THANX AGAIN, NICK
Ne-ways, i was hesitant originally, but i figured out that i had to probe the back side of the plug, stickin it through the same path as the wires travel.
My tps was already at 0.96 so not to much adjustment was needed, but damn those screws were stubborn, definately affraid of strippin them. Anyways, got it up to 0.995, should be good enough.
Now i have to take some of the slack out of my throttle cable cause when i put a brick on the peddle i got up to about 3.5 but when i did the TB by hand i got closer to 5, so that is definately my next project.
THANX AGAIN, NICK