Brought to you in part by:

.

Shop Eastwood for your Auto Restoration Needs!


  Mustangsandmore Forums
  '79 to '93 -- The Fox Mustang & Capri
  TPS setting

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   TPS setting
DidgeyTrucker
Gearhead

Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99

posted 07-29-2003 02:27 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
My car is a 1988 LX 2.3 automatic. I thought my throttle position sensor was bad so I bought a new one.

I've seen and read different versions of how to set the voltage on this one. The car ran OK with the old one that was set at 1-1/2 volts at idle. I set the new one at 1 volt at idle. Now it dies when I stop. It never did that with the old TPS with the higher voltage setting.

So what IS the correct procedure for replacing the TPS on a 1988 2.3 four cylinder with automatic?

And I still have the original problem. Between idle and half throttle SOMETIMES there is a dead spot where it seems like the fuel shuts off. If I go past half throttle the motor comes back to life. Sometimes I can work the throttle up and down through the "bad spot" and it will work perfectly. A new computer didn't solve the problem, either!

My 1966 F-100 is more dependable.

Tracy

------------------
Tracy M&M #245
MAC OS9.1
1956 F-100 Panel w/429
(3.50 9")
1966 F-100 SWB w/351C
(3.25 9" - 3.70 posi for Saturday nights)
Music City F-100's,
1965 GT-350 S/C
(2.78 1st & 3.70 TracLok 9")
Music City Mustang Club
Don't focus on the destination....make the JOURNEY the adventure
Visit my Web site: DidgeyTrucker's Website

IP: Logged

FISHTAIL
Gearhead

Posts: 566
From: Waldorf/College Park MD USA
Registered: Sep 2000

posted 07-29-2003 08:32 PM     Click Here to See the Profile for FISHTAIL   Click Here to Email FISHTAIL     Edit/Delete Message   Reply w/Quote
Are you sure that the problem is the TPS? What about the IAC motor?

------------------
-FISHTAIL
92GT "The Ghetto Sled" (less ghetto with new paint)
CMSC major @ University of MD college park
Best ET/MPH thus far: 14.40/100.67mph....damn wheel spin.
VP and co-founder of CMTC www.cmntc.com

IP: Logged

DidgeyTrucker
Gearhead

Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99

posted 07-29-2003 11:49 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
It acted like it could have been the TPS. It's a varible resistor, like the volume control on a radio. Did you ever have a radio that had a "scratchy" spot when you turned up the volume, but if you repeatedly turned the volume up and down quickly it "wiped" the scratchy spot clean? My car acted like this, when I stepped on the gas, in certain areas of throtte travel the motor would almost die. But if I worked the gas pedal up and down, the hesitation would go away, like I cleaned the dirty spot of the TPS. Sometimes it won't even act up at all. I know now it's NOT the TPS because a new one acts the same way. But now the car dies when I come to a stop.

How do you set the voltage on a TPS for a 1988 2.3 automatic??

And what is an IAC motor??

I'm ready to trade this car for a V8 car with a carburetor!

Tracy

IP: Logged

Rob Parsons
Gearhead

Posts: 189
From: Lebanon,TN
Registered: Jan 2000

posted 07-30-2003 08:41 AM     Click Here to See the Profile for Rob Parsons   Click Here to Email Rob Parsons     Edit/Delete Message   Reply w/Quote
Tracy,
On the 5.0 cars the TPS sensor should be set to .9-1V with the key on and the engine off. I would think the procedure is the same for the 2.3. I don't know about the voltage. I think the IAC he is referring to is the air bypass valve on the side of the throttle body.

IP: Logged

itlbrnmoff
Gearhead

Posts: 907
From: Indianapolis,IN.USA
Registered: Nov 2002

posted 07-30-2003 02:35 PM     Click Here to See the Profile for itlbrnmoff   Click Here to Email itlbrnmoff     Edit/Delete Message   Reply w/Quote
The IAC is the idle air control switch. The computer automatically adjusts the IAC when the throttle lever goes back to the idle position to keep the engine from dying.
It also raises the idle a bit when you turn on the A/C which tends to lower the idle speed when the compressor kicks in.
There may be a way to manually adjust the IAC at the point of contact with the throttle lever, if so, turn the nut either way to raise or lower the idle if it no longer works automatically.

IP: Logged

DidgeyTrucker
Gearhead

Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99

posted 07-31-2003 12:12 AM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
OK, I have been given different advice about setting the idle speed for the position of the throttle for adjusting the TPS voltage. I've heard:
1) disconnect the "bypass valve"
2) adjust idle to just barely running
3) adjust idle to proper idle speed.

When adjusting the TPS, WHAT idle speed do I use? Is the IAC disconnected?

Anybody want to trade me a V8 car with a carburetor?

Tracy

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2003, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[About M&M][Acronyms][Calendar][Chat][Classifieds] [Members' Pics] [M&M Mug Shots]

[ Mustangsandmore.com Bookstore] [Mustangsandmore.com T-Shirts][Tech Articles]