what is the sensor on the lower intake by the #5 runner?

incoming air temp.

I thought it was the ECT Engine Coolant Temperature sensor.

its the ect. should have a connector that just slides onto what looks like a screw end on that sensor.

Vinnietbird said:

incoming air temp.

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Agreed.

The IAT uses the number 5 runner. and also your coolant temp sender is right by that area, the actual ECT is on the bank 1 side. but honestly i think ur referring to the IAT

I thought it was the ACT.

redknight290 said:

The IAT uses the number 5 runner. and also your coolant temp sender is right by that area, the actual ECT is on the bank 1 side. but honestly i think ur referring to the IAT

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yea true... its easy to see the difference lol.

Part Number 44
Location; Number 5 Runner
Fox Body Engine Tech - CJ Pony Parts, Inc.

4G-KDMP said:

I thought it was the ACT.

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Correct.

Air Charge Temperature.

ACT is generally the reference for the sensor if it's in the intake (like stock on an aero fox).

If the sensor is in the inlet tubing (like on an SN95, Explorer, etc) then it's often called an IAT.

It all performs the same purpose.

^^So if I'm understanding you correctly, when bcmbcmbcm asked what is the sensor on the lower intake by the #5 runner that would be the ACT correct?

4G-KDMP said:

^^So if I'm understanding you correctly, when bcmbcmbcm asked what is the sensor on the lower intake by the #5 runner that would be the ACT correct?

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Yes, you're correct - that's the best answer.

I didnt think we were nit-picking it earlier and agreed with the general idea of it being an air temp sensor (to contrast the alternative coolant sensor answers).

HISSIN50 said:

ACT is generally the reference for the sensor if it's in the intake (like stock on an aero fox).

If the sensor is in the inlet tubing (like on an SN95, Explorer, etc) then it's often called an IAT.

It all performs the same purpose.

Click to expand...

Not that it matters, since it is just useless trivia, but my understanding was that prior to ODD-II every manufacturer had their own name for various sensors and Ford called it ACT. One of the OBD-II requirements was standardized names for sensors so when Ford switched to OBD-II it became IAT which is the government mandated name.

Ford was using IAT nomenclature for the OBD-I SN95 Mustangs.

HISSIN50 said:

Ford was using IAT nomenclature for the OBD-I SN95 Mustangs.

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Yep, in preparation for the upcoming standardization being pushed by SAE...
(Ford was actually ahead of the curve? )

How the heck are you JT?