What is TPS
Junior Member
Joined: May 1999
Posts: 9
Likes: 0
From: Glendale,Az..USA
i think it stands for ... throttle position sensor....What is the mod supposed to do ???
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98 F-150 XL 4X4 Extended cab. Custom Built light bar mounted on front bumper (built by me) Holding 3 kc daylighters. This truck is all bussiness . no flash .. just results....
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98 F-150 XL 4X4 Extended cab. Custom Built light bar mounted on front bumper (built by me) Holding 3 kc daylighters. This truck is all bussiness . no flash .. just results....
Member
Joined: Mar 1999
Posts: 70
Likes: 0
From: Windsor, VA
Hey yall, I just searched for TPS on here and found this post by "Bluedefens". I copied and pasted it.
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.
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.
Member
Joined: May 1999
Posts: 50
Likes: 0
From: Indianapolis, In
CONFUSED: GMC305/CHAPLIN, you say that this TPS is adjustable. I got my new Haynes manual out for Ford pickups/Expedition 97 thru 98 and turned to chapter 6 page 8 that shows how to check the sensor. Under the replacement procedures it states "THE TPS IS A NON-ADJUSTABLE UNIT" I like to know if the book is wrong. Where did you guys here about this being a adjustable sensor. Thanks for any help on this.
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97 F150 XLT, 5.4, EXTANG, SUPERCHIP,EDELBROCK SHOCKS,REAR SLIDER, GIBSON CAT-BACK,BOSCH +4,HELLWIG SWAY BAR,AIRAID.
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97 F150 XLT, 5.4, EXTANG, SUPERCHIP,EDELBROCK SHOCKS,REAR SLIDER, GIBSON CAT-BACK,BOSCH +4,HELLWIG SWAY BAR,AIRAID.
Member
Joined: Mar 1999
Posts: 70
Likes: 0
From: Windsor, VA
Indy,
Let me start by saying that I know nothing more than what I've found and copied and pasted above. The post I made above was a direct copy of one made by "Bluedefens". Again I've never done this, but from reading the directions again it sounds like the TPS is adjusted by adjusting the mounting screws; which appears to be just slightly changing the mounting location and not actually modifying the sensor itself?
Hopefully someone who has done this themselves and knows more will stop by and enlighten us.
Let me start by saying that I know nothing more than what I've found and copied and pasted above. The post I made above was a direct copy of one made by "Bluedefens". Again I've never done this, but from reading the directions again it sounds like the TPS is adjusted by adjusting the mounting screws; which appears to be just slightly changing the mounting location and not actually modifying the sensor itself?
Hopefully someone who has done this themselves and knows more will stop by and enlighten us.
Senior Member
Joined: Feb 1999
Posts: 249
Likes: 0
From: Kissimmee, Florida, United States
The throttle pos. sensor on my old truck was not adjustable. I've never heard of one that was, or why one would be. All it does is tell the computer what position the butterfly valve is in. I would assume that it fools the computer so it enriches the fuel/air mixture.
If you read the post it tells you to "enlarge the mountung holes slightly", I would not advise anyone to modify any sensor, besides, that mod might be fine if you're running the quarter mile but I bet you wouldn't feel it on the street.
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'97 F-250 L/D Lariat S/C, 4x4, 5.4, E4OD automatic, 3.73 gears, 4 wh. ABS and 4 wh. disk brakes, gray leather interior,keyless entry w/alarm, outside: white w/gray rocker section, sliding rear window, tow package. Mods- Ford running boards, Ford ventsahdes, Color-matched bug deflector, AVS tail light covers, Tuff Liner bed liner, unknown brand of cat-back exhaust system (previous owner installed).
If you read the post it tells you to "enlarge the mountung holes slightly", I would not advise anyone to modify any sensor, besides, that mod might be fine if you're running the quarter mile but I bet you wouldn't feel it on the street.
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'97 F-250 L/D Lariat S/C, 4x4, 5.4, E4OD automatic, 3.73 gears, 4 wh. ABS and 4 wh. disk brakes, gray leather interior,keyless entry w/alarm, outside: white w/gray rocker section, sliding rear window, tow package. Mods- Ford running boards, Ford ventsahdes, Color-matched bug deflector, AVS tail light covers, Tuff Liner bed liner, unknown brand of cat-back exhaust system (previous owner installed).
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
Well, the *backgdound* on checking TPS voltage is just to make sure that is isn't significantly below 1 volt, and this comes from the 5.0 Mustang tuners originally. Some vehicles come from the factory with the voltage too low for quick throttle response, such as below .900 or so. So it's not a matter of actually getting new-found horsepower so much as it is making sure you have the best throttle response you can get without ruining your idle characteristics.
Bests,
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Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Bests,
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Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com