86 Iroc TPI IAT sensor ?.
07-11-2004, 12:51 PM
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Car: 1990 Formula
Engine: 355
Transmission: T5
86 Iroc TPI IAT sensor ?.
I just purchased a 86 iroc and the IAC is not hooked up, on a 86 does anyone know where I can trace th ewires to so I can hook it back up. can not find the plug anywhere.
07-11-2004, 01:15 PM
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Car: 1990 Formula
Engine: 355
Transmission: T5
Ok, does the 86 require the IAT? and is it on the air box. I know the air intake unit has been replaced and just noticed that the sensor on the new lid is in it.
07-11-2004, 02:13 PM
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Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Are you looking for the Idle Air Control (IAC) or the Manifold Air Temp (MAT) sensor or as you call it the IAT. Yes you need the MAT and it is located in the underside of the plenum towards the rear. The schematic that I included was for the IAC, not the MAT. Here is the schematic for the MAT. There is a short wire harness from the MAT to a connector on the wire bundle at the firewall near the wiper motor that goes to the ECM.
Last edited by Trickster; 07-11-2004 at 02:15 PM.
07-11-2004, 02:16 PM
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Car: 1990 Formula
Engine: 355
Transmission: T5
the MAT and IAC are hooked up I am refering to th eIAT sensor which on the side of the intake box coming across the radiator
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07-11-2004, 07:06 PM
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Car: 1990 Formula
Engine: 355
Transmission: T5
no that is not is it is a IAT sensor, I believe the air unit is off of a newer model, it appears to be the same as the one on my LT1 car. From what I have seen the 86 does not require it. so they just left it in there, it is actually a 1" sensor that goes into the air box to measure air going into the intake.
07-11-2004, 07:19 PM
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Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
on a stock TPI car, the IAT is on the bottom of the plenum, near the distributor.
A lot of people relocate it to the airbox for cooler sensor readings.
A V6 car has the IAT in the iarbox.
A lot of people relocate it to the airbox for cooler sensor readings.
A V6 car has the IAT in the iarbox.
10-05-2007, 10:14 AM
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Re: 86 Iroc TPI IAT sensor ?.
I have a88 Trans Am 305 TPI. I did an engines rebuild and started hooking up the connectors. The IAT - MAT connector looks like it connects to the coil there is an adjacent matching connector from the ECM to the coil. Is this correct? I can't find any connector near the firewall that matches.
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