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Author
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Topic: TPS setting
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DidgeyTrucker
Gearhead Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99
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posted 07-29-2003 02:27 PM
   
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
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FISHTAIL
Gearhead Posts: 566
From: Waldorf/College Park MD USA
Registered: Sep 2000
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posted 07-29-2003 08:32 PM
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
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DidgeyTrucker
Gearhead Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99
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posted 07-29-2003 11:49 PM
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
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Rob Parsons
Gearhead Posts: 189
From: Lebanon,TN
Registered: Jan 2000
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posted 07-30-2003 08:41 AM
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.
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itlbrnmoff
Gearhead Posts: 907
From: Indianapolis,IN.USA
Registered: Nov 2002
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posted 07-30-2003 02:35 PM
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. 
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DidgeyTrucker
Gearhead Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99
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posted 07-31-2003 12:12 AM
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
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