tps on new throttle body

chiaronate · 09-25-2004, 12:09 AM

hey, i recently installed a mac throttle body, and it doesn't seem to be working with my throttle position sensor. i used the tps from my factory throttle body and it idles at about 2000 rpm. does anyone know how to fix this problem?

xxxBlakexxx · 09-25-2004, 06:13 AM

Most likely the TPS is bad or on wrong. They are easy to mess up when removing rom the old TB. Buy a new one they are about $25 at auto parts places.

Other than that, it could be that the IAC is stuck open or a vacum hose is off. Try the TPS first.

chiaronate · 09-25-2004, 10:59 AM

i'm pretty sure it's the tps because it idles normal when i disconnect it. if i put on a new tps, will it have to be adjusted, or should it work with the mac throttle body without changing the screw holes? how do they get messed up from removing them?

Luka · 09-25-2004, 07:41 PM

Do you have access to a scan tool or multi-meter?
If scan tool chk your TP pid an chk the voltage.....usually around .9 volts for fords... .5 GM
Should be at or allmost 5v at WOT....
quik easy chk without haveing to throw parts at it to try to fix it.

Alot of the time when switching Throttle bodies you need to set minimum idle with the IAC valve unbluged...could possibly be your problem aswell. You should have a throttle stop on there somewhere that can be turned in-out as needed. Try that stuff out before spending cash on something that may be an easy fix.

Luka

chiaronate · 09-25-2004, 10:35 PM

what is involved in setting the minimum idle with the iac unplugged? should i disconnect the battery to reset the computer? is it possible that i would have to adjust the tps so that it works with the mac throttle body? i've already messed up my tps when i was testing it with the voltmeter. i'm getting a new one tomorrow, and i was going to disconnect the negative battery terminal before installing it. would this work?

chiaronate · 09-26-2004, 04:39 PM

hey, i fixed my tps problem. i recently got a mac 70mm throttle body to replace my factory 65mm throttle body and the idle was hanging with the tps in place. so, i used a voltmeter and got a reading of .90 volts with the factory 65mm in place. i installed the mac throttle body and sensor and the sensor reading was 1.01 or so. so i used a drill to change the hole sizes in the tps until i got a reading of .90 with it on the throttle body. the strange thing is, i had a bit of a hanging idle with the factory throttle body and tps in place with the tps at .90. with the mac throttle body installed, i have no hanging idle at all at the same tps voltage. i mean, the idle drops quickly after i let off the gas, so i get that added bonus. just thought i'd post my experience so that someone else can benefit from it.

09-25-2004, 12:09 AM	#1
chiaronate Registered Member Join Date: Jul 2002 Location: watervliet, ny Posts: 105	tps on new throttle body hey, i recently installed a mac throttle body, and it doesn't seem to be working with my throttle position sensor. i used the tps from my factory throttle body and it idles at about 2000 rpm. does anyone know how to fix this problem? __________________ 2000 mustang gt, silver with black interior and manual transmission current performance mods: 80mm pro-m with filter c&l plenum mac 70mm throttle body mac underdrive pulleys pro 5.0 shifter 3.90 gears dynomax super turbo mufflers diablosport predator programmer future performance mods: x-pipe with converters

09-25-2004, 06:13 AM	#2
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	Most likely the TPS is bad or on wrong. They are easy to mess up when removing rom the old TB. Buy a new one they are about $25 at auto parts places. Other than that, it could be that the IAC is stuck open or a vacum hose is off. Try the TPS first. __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

09-25-2004, 10:59 AM	#3
chiaronate Registered Member Join Date: Jul 2002 Location: watervliet, ny Posts: 105	i'm pretty sure it's the tps because it idles normal when i disconnect it. if i put on a new tps, will it have to be adjusted, or should it work with the mac throttle body without changing the screw holes? how do they get messed up from removing them? __________________ 2000 mustang gt, silver with black interior and manual transmission current performance mods: 80mm pro-m with filter c&l plenum mac 70mm throttle body mac underdrive pulleys pro 5.0 shifter 3.90 gears dynomax super turbo mufflers diablosport predator programmer future performance mods: x-pipe with converters

09-25-2004, 10:35 PM	#5
chiaronate Registered Member Join Date: Jul 2002 Location: watervliet, ny Posts: 105	iac valve? what is involved in setting the minimum idle with the iac unplugged? should i disconnect the battery to reset the computer? is it possible that i would have to adjust the tps so that it works with the mac throttle body? i've already messed up my tps when i was testing it with the voltmeter. i'm getting a new one tomorrow, and i was going to disconnect the negative battery terminal before installing it. would this work? __________________ 2000 mustang gt, silver with black interior and manual transmission current performance mods: 80mm pro-m with filter c&l plenum mac 70mm throttle body mac underdrive pulleys pro 5.0 shifter 3.90 gears dynomax super turbo mufflers diablosport predator programmer future performance mods: x-pipe with converters

09-26-2004, 04:39 PM	#6
chiaronate Registered Member Join Date: Jul 2002 Location: watervliet, ny Posts: 105	fixed it! hey, i fixed my tps problem. i recently got a mac 70mm throttle body to replace my factory 65mm throttle body and the idle was hanging with the tps in place. so, i used a voltmeter and got a reading of .90 volts with the factory 65mm in place. i installed the mac throttle body and sensor and the sensor reading was 1.01 or so. so i used a drill to change the hole sizes in the tps until i got a reading of .90 with it on the throttle body. the strange thing is, i had a bit of a hanging idle with the factory throttle body and tps in place with the tps at .90. with the mac throttle body installed, i have no hanging idle at all at the same tps voltage. i mean, the idle drops quickly after i let off the gas, so i get that added bonus. just thought i'd post my experience so that someone else can benefit from it. __________________ 2000 mustang gt, silver with black interior and manual transmission current performance mods: 80mm pro-m with filter c&l plenum mac 70mm throttle body mac underdrive pulleys pro 5.0 shifter 3.90 gears dynomax super turbo mufflers diablosport predator programmer future performance mods: x-pipe with converters

09-25-2004, 07:41 PM	#4
Luka Registered Member Join Date: Sep 2004 Posts: 4	Do you have access to a scan tool or multi-meter? If scan tool chk your TP pid an chk the voltage.....usually around .9 volts for fords... .5 GM Should be at or allmost 5v at WOT.... quik easy chk without haveing to throw parts at it to try to fix it. Alot of the time when switching Throttle bodies you need to set minimum idle with the IAC valve unbluged...could possibly be your problem aswell. You should have a throttle stop on there somewhere that can be turned in-out as needed. Try that stuff out before spending cash on something that may be an easy fix. Luka

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