Tps is 4.97 @ closed throttle!!!

TattLife · June 18th, 2011, 08:11 PM

I have a 1989 mustang 5.0 and it seems to be running and idling fine (right below 1 grand about 900)despite the constant strong gas smell which i thought was due to deleting the charcoal canister and not having a vented gas cap. I decided to check the tps voltage just because, and it seems as tho im getting a reading of 4.97 @ closed throttle with a dvm reading from ground on firewall to green sig wire. I have tried adjusting the tps by rotating in one way and another but it seems to give the same reading. I have asked a couple of buddies and they've pretty much told me if it aint broke dont fix it,but in my opinion something may indeed need to be fixed. I was also considering elongating the holes on the tps to try and get a better adjustment because it dosent seem to move very much in the first place. If anyone has had a similar problem, suggestions or just some good old fashioned knowledge i would greatly appreciate it.

Digsj7 · June 18th, 2011, 10:21 PM

don't ground it on the firewall. Poke the wire with the red stripe (or green) through it with the red lead on the dvm and the gray wire with the black stripe (IIRC) with the black lead. Should be at .95 to .98 @ closed throttle. I wobbled out the holes on mine for adjustment and just did it to a buddies also...it's fine.

That's the way I've always done it anyway.

kmedeiros88 · June 18th, 2011, 11:31 PM

You tested it with the car off right? Did you test the orange wire to ground?

fogged306 · June 19th, 2011, 12:12 AM

It's the green wire and the blk/wht wire you want to probe. Blk/wht is the signal return wire which is basically the ground that goes to all the sensors and back to the computer. The actual signal wire for the TPS is green and the vref (5 volt supply) is the orange wire. This needs to be tested with the key in the on position. Black lead from the meter to the blk/wht and red lead from the meter to the green wire.

The computer re-learns TPS voltage every time you cycle the key. It doesn't need to be at that bullshit mythical .98v or .99 or .97, or whatever other number people want to make up. As long as it's above .5 and below 1.19 with the blade closed it's within spec.

http://www.veryuseful.com/mustang/te...ng_Diagram.gif

June 18th, 2011, 08:11 PM	#1
TattLife Look Ma! My First Post! 1989 mustang 5.0 5spd Join Date: Jun 2011 Location: Jacksonville,Florida Posts: 1 iTrader: 0 reviews	Tps is 4.97 @ closed throttle!!! I have a 1989 mustang 5.0 and it seems to be running and idling fine (right below 1 grand about 900)despite the constant strong gas smell which i thought was due to deleting the charcoal canister and not having a vented gas cap. I decided to check the tps voltage just because, and it seems as tho im getting a reading of 4.97 @ closed throttle with a dvm reading from ground on firewall to green sig wire. I have tried adjusting the tps by rotating in one way and another but it seems to give the same reading. I have asked a couple of buddies and they've pretty much told me if it aint broke dont fix it,but in my opinion something may indeed need to be fixed. I was also considering elongating the holes on the tps to try and get a better adjustment because it dosent seem to move very much in the first place. If anyone has had a similar problem, suggestions or just some good old fashioned knowledge i would greatly appreciate it.

June 18th, 2011, 10:21 PM	#2
Digsj7 Enthusiast 1993 Mustang LX my dog runs faster... Join Date: Jun 2010 Location: Columbus NE Posts: 626 iTrader: 0 reviews	don't ground it on the firewall. Poke the wire with the red stripe (or green) through it with the red lead on the dvm and the gray wire with the black stripe (IIRC) with the black lead. Should be at .95 to .98 @ closed throttle. I wobbled out the holes on mine for adjustment and just did it to a buddies also...it's fine. That's the way I've always done it anyway. __________________ CAI, GT40 Intake, GT40P heads, 1.72 RR, 70mm Accufab, UPR Control arms, Hedman Headers, Mac H-Pipe, Flows, Pro-5.0, 3.73 Gears, BBK caster/camber kit, Eibach springs, Subframe Connectors, 5 lug conversion, MM+Cleavage Club Member #19

June 18th, 2011, 11:31 PM	#3
kmedeiros88 Regular 89 Mustang LX Hatch Join Date: Feb 2011 Location: Fall River, MA Posts: 324 iTrader: 0 reviews	You tested it with the car off right? Did you test the orange wire to ground? __________________

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June 19th, 2011, 12:12 AM	#4
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	It's the green wire and the blk/wht wire you want to probe. Blk/wht is the signal return wire which is basically the ground that goes to all the sensors and back to the computer. The actual signal wire for the TPS is green and the vref (5 volt supply) is the orange wire. This needs to be tested with the key in the on position. Black lead from the meter to the blk/wht and red lead from the meter to the green wire. The computer re-learns TPS voltage every time you cycle the key. It doesn't need to be at that bullshit mythical .98v or .99 or .97, or whatever other number people want to make up. As long as it's above .5 and below 1.19 with the blade closed it's within spec. http://www.veryuseful.com/mustang/te...ng_Diagram.gif

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