Where is the IAT (air intake temp.) sending unit? - Mustang Evolution

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Old 04-02-2005, 04:54 PM   #1
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Unhappy Where is the IAT (air intake temp.) sending unit?

Hello,

I was just trying to figure out where my IAT sending unit or IAT sensor plug is located on my 1989 Mustang LX 5.0L. I just got a performance upgrade mod, and the instructions say I need to locate the IAT sending unit or IAT sensor plug. But I don't know where to look for them at.

Please Help Me!

Thanks,
Nyssa
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Old 04-02-2005, 05:26 PM   #2
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I just went out to look over my '89.. couldn't find it anywhere's... you sure we have one?
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Old 04-02-2005, 05:29 PM   #3
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I'm not sure. The information I got says we do. It says it may be located in the air intake tube or in the intake manifold or right around your throtthle body. I tried to look but I couldn't find anything. I don't even know what it looks like
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Old 04-02-2005, 05:37 PM   #4
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I'm still not seeing it.. I see a TP sensor a MAF sensor and an IAC in my wiring harness I'm not seeing anything else
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Old 04-02-2005, 05:37 PM   #5
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and I work on fords for a living d'oh
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Old 04-02-2005, 05:40 PM   #6
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okay I just completely checked the intake arm/throttle body.. I did not find an IAT anywhere's on my '89, nothing ahead of the throttle body anyway.. if there's anything else its under the intake manifold but that makes no sense since our TBs are heated
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Old 04-02-2005, 08:08 PM   #7
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are you sure its not the ACT (air charge temp sensor) or IAB (idle air bypass) and you just got them mixed together? the ACT is located on the driver's side of the lower intake behind the distributor. the IAB is on the throttle body.
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Old 04-02-2005, 08:10 PM   #8
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Well what part did you buy that could help us out.
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Old 04-02-2005, 10:35 PM   #9
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it was that little mod that puts a resistor on your IAT sensor to make it think its colder than it is
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Old 04-02-2005, 10:37 PM   #10
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Quote:
Originally Posted by Tbird232ci
it was that little mod that puts a resistor on your IAT sensor to make it think its colder than it is

ahh.. that's a pretty useless mod anyway sell it to some unsuspecting classmate or something
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Old 04-02-2005, 10:57 PM   #11
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I am guessing that you have a 5.0 CFI engine, Sooo I looked it up in my Hayne's manual to see if I could help.

You do not have a IAC on your engine, the IAC is for carburated engines (That's what the book says anyway.). According to this manual you have an ACT: Air Charge Temperature sensor. It shows the location of the ACT sensor on the intake manifold, it has an electrical connector on it. I scanned an pic from the manual that will hopefully help you find it.
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Old 04-02-2005, 11:11 PM   #12
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CFI stopped in the stangs in 85, and that was only the auto HO cars
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Old 04-03-2005, 12:00 AM   #13
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Quote:
Originally Posted by Tbird232ci
CFI stopped in the stangs in 85, and that was only the auto HO cars
That's odd, my Haynes book is for 79-93 and the only 5.0 it listed in the ECS section for EEC-IV was the 5.0 CFI.

There is a 5.9L SEFI on the page after that...could that be a typo?

I'm not familiar with the spec. on alot of the older Stangs...
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Old 04-03-2005, 08:32 AM   #14
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86-93 mustangs are 5.0 SEFI
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Old 04-03-2005, 11:37 AM   #15
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Ahhh, ok.....thanks!

The page says 5.9, but the pic has 5.0 on the intake...LOL :buckteeth

Oh well maybe this pic will help you find what your looking for.
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Old 04-03-2005, 11:54 AM   #16
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Okay. Thank You
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Old 04-03-2005, 12:00 PM   #17
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Well... I'm not really sure. The directions say, "You may have to do some searching to find your IAT (Intake Air Temperature) sending unit is located. It is usually located in the Air Intake Tube (where the air flows into your engine) or it may be located in the intake manifold, or right around the throttle body. It should be a connector/plug with two small wires going to it, and a clip on the side of the plug." But I couldn't find it. Maybe the directions are wrong, I don't know
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Old 04-03-2005, 12:06 PM   #18
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It is a performance module: it is a +20HP speed chip. It says, "By using our Performance Module your Ford Mustang's ECU will receive slightly adjusted ratios which make your car think its taking in more cold air, which inturn will cause the Air/Fuel ratios to be slightly adjusted to offer more performance."
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Old 04-03-2005, 12:10 PM   #19
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Well, I still can't find it, but I'm gonna go back out and try to look again. I just wanted to say thanks to everyone thats been trying to help me. I appreciate it.
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Old 04-03-2005, 12:29 PM   #20
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Quote:
Originally Posted by 89MustangLX
It is a performance module: it is a +20HP speed chip. It says, "By using our Performance Module your Ford Mustang's ECU will receive slightly adjusted ratios which make your car think its taking in more cold air, which inturn will cause the Air/Fuel ratios to be slightly adjusted to offer more performance."
it wont add any power just sell it.
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Old 04-03-2005, 01:26 PM   #21
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dont the fox bodies do it diff... like a sensor in the uppe or something odd like that
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Old 04-03-2005, 02:22 PM   #22
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Quote:
Originally Posted by 232stang
it wont add any power just sell it.

good idea

that 'chip' / 'module' has been sold on ebay for ages.. it's a $2 resistor in a pretty package that's used to change the resistance values of a sensor that are being read by the PCM, all it does is cause the car to run a bit on the rich side (slightly more power) BUT.. at WOT the thing's running in open loop anyway, so you're basically getting max timing/fuel delivery... so it's pretty pointless
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Old 04-03-2005, 05:54 PM   #23
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Quote:
Originally Posted by MonteCitan
that 'chip' / 'module' has been sold on ebay for ages.. it's a $2 resistor in a pretty package that's used to change the resistance values of a sensor that are being read by the PCM, all it does is cause the car to run a bit on the rich side (slightly more power) BUT.. at WOT the thing's running in open loop anyway, so you're basically getting max timing/fuel delivery... so it's pretty pointless
I have to agree, this mod chip is not going to give you 20 HP, It might make your engine idle faster, and or use more fuel than normal. But you will not see a huge difference in proformance.

But if you still want to try it out...I can tell ya that there is no IAT sensor on your engine listed in the Haynes manual, in the pic I posted for the 5.0 SEFI you can see an ACT sensor on the intake manifold toward the front of of the engine. This is the closest thing I can find to what you are looking for.

BTW: You would probably get better results just replacing your paper air filter with a K&N air filter.
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Old 04-04-2005, 12:03 AM   #24
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Okay, Thanks for your help everyone.
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Old 04-04-2005, 12:06 AM   #25
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sorry you got taken by the ebay scammers.
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Old 06-30-2006, 05:50 PM   #26
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Re: Where is the IAT (air intake temp.) sending unit?

This could be too little too late but the iat sensor is acutally screwed into the lower manifold on the # 3 bank. You can not visually see it unless the upper manifold is removed. I recently switched to a explorer intake and have had to deal with this. Hope this helps.
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Old 06-30-2006, 08:58 PM   #27
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Re: Where is the IAT (air intake temp.) sending unit?

The IAT sensor is also called the Air Charge Temperature (ACT) sensor, in '86-'93 5.0's is located between lower intake runners #5 and #6....this pic might be of help....

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Old 07-24-2006, 01:08 PM   #28
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Re: Where is the IAT (air intake temp.) sending unit?

fast 64 is right the act sensor is what you are lookin for, it is in the #5 intake runner behind the dist on the drivers side. it has a round plug with two wires going to it. be carefull the plug and wires will most likely be fragile.
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