Throttle positioning sensor =frustration!

stephen · September 20th, 2009, 12:15 AM

This is an explanation

Setting the Mustang TPS Voltage

From what you describe it sounds more like a problem with the idle air control valve (IACV). The throttle body should close all the way down to the stop screw and then the IACV controls air at idle. The TPS should have come with the throttle body.

Also the MAF determines the flow rate and could be contributing to the problem. The computer is taking in data from the TPS, MAF, and oxygen sensors to adjust the mixture.

stephen · September 20th, 2009, 12:39 AM

According to this the TPS isn't adjustable

Mustang TPS FAQ

It explains how the system works.

RFM 40th V6 · September 20th, 2009, 03:18 AM

Personally I would think that it's a defective replacement part.

If it's any sort of electronics or parts that need to be very accurate I'd go with factory parts. I've seen a lot of complaints that are fixed by putting factory sensors on in place of a cheap sensor from auto zone. Not to say that all aftermarket sensors are junk, I just prefer factory.

JTs03v6 · September 20th, 2009, 10:46 AM

Originally Posted by stephen

According to this the TPS isn't adjustable

Mustang TPS FAQ

It explains how the system works.

You adjust it with the set screw.

boblongtv · September 20th, 2009, 06:25 PM

Originally Posted by RFM 40th V6

Personally I would think that it's a defective replacement part.

If it's any sort of electronics or parts that need to be very accurate I'd go with factory parts. I've seen a lot of complaints that are fixed by putting factory sensors on in place of a cheap sensor from auto zone. Not to say that all aftermarket sensors are junk, I just prefer factory.

I put my stock tb back on and its still messed up. I never touched the set screw so I dont think that is the problem. It has to be the sensor. Do you think there is a big difference between a factory tps and an autozone one?

RFM 40th V6 · September 20th, 2009, 07:21 PM

Originally Posted by boblongtv

I put my stock tb back on and its still messed up. I never touched the set screw so I dont think that is the problem. It has to be the sensor. Do you think there is a big difference between a factory tps and an autozone one?

Only in the quality of the parts as far as I know.

I haven't ever tested one sensor against another so I'm not sure which is more accurate. I do however know that a lot of the time people put on these aftermarket sensors and they can cause issues. It also may fail sooner than a factory part.

I know a lot of people are against the whole dealership but sometimes it is better to just use the original parts.

I don't know if you've tried disconnecting your battery yet or not. If you haven't try disconnecting it and let it sit for about 10 minutes. That should reset the KAM. Which will reset your idle and all other adaptable parameters.

Also someone mention and IAC valve. This could be stuck open. Try removing it and cleaning that if resetting your KAM doesn't work.

boblongtv · September 20th, 2009, 07:53 PM

Ill try that. Could I have put the sensor in wrong?

boblongtv · September 23rd, 2009, 03:16 PM

So today im supposed to get this fixed and I took off my stock tb again to switch it back with the 65mm bbk one. I made sure I did everything correct. I looked at the pics of wat my tps should look like and I believe I have the wrong kind.....It is a ford mustang tps but an offbrand and the mounting locations are wrong, compared to the OEM picture of the tps mounting locations.

OEM tps PIC: http://i649.photobucket.com/albums/u...621933DEL1.jpg

autozone tps pic: http://i649.photobucket.com/albums/u...gtv/141136.jpg

boblongtv · September 26th, 2009, 03:40 PM

I fixed it!!! I bought a new tps from the ford dealership. Thanks for yalls help!

September 20th, 2009, 03:18 AM	#23
RFM 40th V6 Regular 2004 Ford Mustang 15.4@93.6 aka way too slow Join Date: Apr 2009 Location: Crofton MD Posts: 288	Personally I would think that it's a defective replacement part. If it's any sort of electronics or parts that need to be very accurate I'd go with factory parts. I've seen a lot of complaints that are fixed by putting factory sensors on in place of a cheap sensor from auto zone. Not to say that all aftermarket sensors are junk, I just prefer factory. __________________ 04 3.9l V6 Ford Tech \|Performance\| CAI, BBK Shorty Headers, Pypes Catted X-Pipe, Street Pro Mufflers, 4 Bank Eliminator w/ 93+ Tune \|Handling\| FRPP B Springs 1.5" Drop, BFG G-Force Sport Tires, Slotted & Cross Drilled Rotors

September 23rd, 2009, 03:16 PM	#28
boblongtv Regular 1999 Mustang V-6 Slow for now Join Date: Jan 2008 Location: Easton, Maryland Posts: 172	So today im supposed to get this fixed and I took off my stock tb again to switch it back with the 65mm bbk one. I made sure I did everything correct. I looked at the pics of wat my tps should look like and I believe I have the wrong kind.....It is a ford mustang tps but an offbrand and the mounting locations are wrong, compared to the OEM picture of the tps mounting locations. OEM tps PIC: http://i649.photobucket.com/albums/u...621933DEL1.jpg autozone tps pic: http://i649.photobucket.com/albums/u...gtv/141136.jpg Last edited by boblongtv : September 23rd, 2009 at 03:19 PM.

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September 20th, 2009, 12:15 AM	#21
stephen Enthusiast Join Date: Feb 2007 Posts: 846	This is an explanation Setting the Mustang TPS Voltage From what you describe it sounds more like a problem with the idle air control valve (IACV). The throttle body should close all the way down to the stop screw and then the IACV controls air at idle. The TPS should have come with the throttle body. Also the MAF determines the flow rate and could be contributing to the problem. The computer is taking in data from the TPS, MAF, and oxygen sensors to adjust the mixture.

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September 20th, 2009, 12:39 AM	#22
stephen Enthusiast Join Date: Feb 2007 Posts: 846	According to this the TPS isn't adjustable Mustang TPS FAQ It explains how the system works.

September 20th, 2009, 07:53 PM	#27
boblongtv Regular 1999 Mustang V-6 Slow for now Join Date: Jan 2008 Location: Easton, Maryland Posts: 172	Ill try that. Could I have put the sensor in wrong?

September 26th, 2009, 03:40 PM	#29
boblongtv Regular 1999 Mustang V-6 Slow for now Join Date: Jan 2008 Location: Easton, Maryland Posts: 172	I fixed it!!! I bought a new tps from the ford dealership. Thanks for yalls help!

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