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  TPS - voltage? idle speed?

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Author Topic:   TPS - voltage? idle speed?
DidgeyTrucker
Gearhead

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

posted 08-02-2003 12:48 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
1988 LX Mustang, 2.3 four cylinder / automatic:
How do I set the TPS. I've been told too many different things.

1) disconnect the IAC? when?
2) idle speed? barely running or correct speed?
3) voltage at TPS?
4) what IS the correct idle speed? in drive?

Tracy

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DidgeyTrucker
Gearhead

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

posted 08-03-2003 06:15 AM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
TTT

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DidgeyTrucker
Gearhead

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

posted 08-04-2003 12:20 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
This car is NOT dependable till I get it fixed. I'm going to park it and start driving my 1966 F-100.

Tracy

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KULTULZ
Gearhead

Posts: 340
From: Rockville, MD
Registered: Oct 2002

posted 08-04-2003 06:05 PM     Click Here to See the Profile for KULTULZ   Click Here to Email KULTULZ     Edit/Delete Message   Reply w/Quote
What's wrong with the car...too low idle speed? Why did you replace the TPS?

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DidgeyTrucker
Gearhead

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

posted 08-04-2003 07:55 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
Here are all the details:

https://mustangsandmore.com/ubb/Forum3/HTML/000899.html

Tracy

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KULTULZ
Gearhead

Posts: 340
From: Rockville, MD
Registered: Oct 2002

posted 08-04-2003 08:24 PM     Click Here to See the Profile for KULTULZ   Click Here to Email KULTULZ     Edit/Delete Message   Reply w/Quote
http://www.se-r.net/engine/tps_voltage_adjustment.html

http://www.etconnect.com/gt/tech.htm

Try to adjust by the examples above. You may have to reset basic idle before you start.

Is the throttle body and IAC motor clean? Fuel pressure OK? Fresh fuel filter? Checked for codes?

If you replaced the TPS thinking it was bad and causing a tip-in problem and the new one didn't improve anything, most likely it was not the TPS. You need to start with codes and fuel pressure readings.

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DidgeyTrucker
Gearhead

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

posted 08-04-2003 08:57 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
I replaced the fuel filter as regular maintenance when I bought the car. I replaced the fuel pump when it died last year. Nothing that I have replaced changes anything.

I guess I need to figure out how to read codes, if I'm going to keep an EFI car. I don't have a "check engine" light burning, but it could be burned out!

And that "basic idle" is where I've received different ideas - correct speed with IAC disconnected and just barely running with IAC disconnected.

And people think Holley four barrels are complicated!

Thanks for the tip.

Tracy

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FISHTAIL
Gearhead

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

posted 08-05-2003 01:48 AM     Click Here to See the Profile for FISHTAIL   Click Here to Email FISHTAIL     Edit/Delete Message   Reply w/Quote
Hey, sorry I haven't been around in a long while.....in the previous post, the IAC is the idle air control. There is a small acutator on the side of the TB that is a bypass to the throttle plate that the computer uses to control your idle speed when your foot is off of the gas. Due to the EGR being where it is, these things tend to get pretty gummed up, and can cause a surging idle problem. I would remove it and clean it, and see if that helps anything. Also, to adjust the tps voltage, you will need to twist the sensor. I'm not sure what the voltage is on a 4 popper but on a 5.0, it should be at .95 or so with the KOEO, and > 4volts at WOT. Have you checked for vaccum leaks? Does the car have any other symptoms?

------------------
-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

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DidgeyTrucker
Gearhead

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

posted 08-06-2003 11:40 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
I don't have a surging idle problem. The other post sums it up as far as the problems I have and the problems are intermittent. The big question I now have THREE answers to is:

Where do you set the throttle at idle before setting the TPS voltage?

I've been told / read:
1) engine barely running with IAC disconnected
2) correct idle speed with IAC disconnected
3) Insert .010 feeler guage at end of idle speed screw. Set gap to .010, then turn screw in 1-1/2 turns
All of these directions were for the 5.0. would the 2.3 four cylinder be the same?

Tracy

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pthornton
Gearhead

Posts: 601
From: Austin, TX USA
Registered: Jun 99

posted 08-08-2003 08:40 PM     Click Here to See the Profile for pthornton   Click Here to Email pthornton     Edit/Delete Message   Reply w/Quote
http://www.corral.net/tech/maintenance/idlereset.html

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DidgeyTrucker
Gearhead

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

posted 08-08-2003 10:47 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
Cool. Now I have TWO diferent versions of how to re-set the computer memory.

Tracy

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