I need help with my efforts at TPS tuning. The following is an excerpt from "Bluedefens" on his experience tuning his TPS:

First remove the plastic cover over the throttle body. (three 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 not 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 start the engine. I know that on the older mustangs, 95 and down it would pick the cars up about a tenth in the quarter mile, all for free. It seems like a lot of work I know, but every little bit counts.

OK, everything was going fine (cover came off, found the TPS sensor, voltage read 0.947 stock) until I tried to loosen the Phillips-head screws. 2 problems, they are in REALLY tight and there’s no room to get my screwdriver to the lower screw.

To anyone who has performed this feat, how did you loosen the screws without stripping them and without removing the right half of your throttle assembly???

TIA,

Jim

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'99 F-250 LD 5.4L SC XLT 2WD 3.73LS in White/Silver (w/ EVERYTHING 'cept leather and engine block heater) -- added: SnugTop Hi-Liner & carpet kit, Donnelly electrochromatic/compass mirror, K&N filter, SuperWhite 9007 bulbs, IAS shocks, Mobil 1, more to come... (Flowmaster 70 cat-back exhaust is on order, Westin side bars, electric fan, Superchip, and silver fender/wheel flares are next)

http://hometown.aol.com/jimorama/myh...ollection.html

 

Thanks for the response, Bob. I'll give it another try this weekend (if the wife will let me get away from re-finishing the hardwood floors...)

Thanks again,

Jim

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'99 F-250 LD 5.4L SC XLT 2WD 3.73LS in White/Silver (w/ EVERYTHING 'cept leather and engine block heater) -- added: SnugTop Hi-Liner & carpet kit, Donnelly electrochromatic/compass mirror, K&N filter, SuperWhite 9007 bulbs, IAS shocks, Mobil 1, more to come... (Flowmaster 70 cat-back exhaust is on order, Westin side bars, electric fan, Superchip, and silver fender/wheel flares are next)

http://hometown.aol.com/jimorama/myh...ollection.html

 

Hello J.
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.
Bob P.