TPS Adjustment and Check

GhOsT6_9 · 03-17-2004, 05:37 PM

Alright exactly how do you check the TPS voltage and then adjust it if needed?? I know the idle voltage should be between 0.9 -0.99VDC

I do have a voltmeter and know how to properly use it. So fire away with how its to be done and which wires to test between.

Thanks for the help.

Hethj7 · 03-17-2004, 09:18 PM

Whenever you have a common thing like this you might want to try searching the site. TPS adjustment is a common topic and there are all kinds of threads on it. Here is what I found:

How To Adjust TPS
"Muscle Mustangs & Fast Fords"
April 1993
The throttle position sensor is one of those things that falls into the category of "computer stuff" that makes a big difference and is easy to deal with, but average people like us would never know about. Without the proper adjustment, the throttle position sensor (TPS) will give the computer a false reading as to the exact throttle opening. A false reading will limit wide open throttle performance (something we definitely don't want). A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. A Radio Shack DVOM, part No. 22-185A, works well for this job.
The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading.

The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts.

Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer.

GhOsT6_9 · 03-17-2004, 09:23 PM

Oh sorry, I shoulda done that first. Completely slipped my mind to do a search on the subject.

Thanks for the reply.

Hethj7 · 03-17-2004, 09:36 PM

No problem. I have been around this place several years now and have just started using the search function

.

mustangII460 · 03-17-2004, 09:58 PM

These are cool

Well that link almost works. Type in TPS in there search, upper left.

Hethj7 · 03-18-2004, 03:01 PM

Yes, that is cool, but not 80 bucks worth of cool

!

03-17-2004, 05:37 PM	#1
GhOsT6_9 Registered Member Join Date: May 2000 Location: Ontario,Canada Posts: 233	TPS Adjustment and Check Alright exactly how do you check the TPS voltage and then adjust it if needed?? I know the idle voltage should be between 0.9 -0.99VDC I do have a voltmeter and know how to properly use it. So fire away with how its to be done and which wires to test between. Thanks for the help. __________________ 1989 Mustang LX Notch 5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials Best 1/4: 13.33@101.53MPH

03-17-2004, 09:18 PM	#2
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Whenever you have a common thing like this you might want to try searching the site. TPS adjustment is a common topic and there are all kinds of threads on it. Here is what I found: How To Adjust TPS "Muscle Mustangs & Fast Fords" April 1993 The throttle position sensor is one of those things that falls into the category of "computer stuff" that makes a big difference and is easy to deal with, but average people like us would never know about. Without the proper adjustment, the throttle position sensor (TPS) will give the computer a false reading as to the exact throttle opening. A false reading will limit wide open throttle performance (something we definitely don't want). A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. A Radio Shack DVOM, part No. 22-185A, works well for this job. The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading. The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts. Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

03-17-2004, 09:23 PM	#3
GhOsT6_9 Registered Member Join Date: May 2000 Location: Ontario,Canada Posts: 233	Oh sorry, I shoulda done that first. Completely slipped my mind to do a search on the subject. Thanks for the reply. __________________ 1989 Mustang LX Notch 5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials Best 1/4: 13.33@101.53MPH

03-17-2004, 09:36 PM	#4
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	No problem. I have been around this place several years now and have just started using the search function . __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

03-18-2004, 03:01 PM	#6
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Yes, that is cool, but not 80 bucks worth of cool ! __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

03-17-2004, 09:58 PM	#5
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	These are cool Well that link almost works. Type in TPS in there search, upper left.

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