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mk2vr6

Weird Intake temp sensor thing

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I`ve got an bad IAT sensor code on my diagnostic.

I have no wiring for this sensor on my `92 OBD1 vr6, I found that the signal for IAT is on pin36 on ecu plug.

The problem is this wire from the ecu is going to the 3rd black (2pin) flange sensor. Now I wonder if it`s factory that this sensor replaces IAT or what, it should be AC sensor as I know. But my car is non AC.

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Yes it is... And I haven't mentioned that the sensor on flange is bad, so replacing it should delete the code. But I'm not sure is it clever to use this connector and connect it to iat sensor becouse connectors are the same...

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PB033951.jpg

The connectors in yellow circles are the same, as I mentioned signal for IAT on pin36 on ecu plug is going on this black sensor on flange. I'm sure it cannot be that factory, someone played with the wiring for sure...

Some people are using IAT from mk4 1.8t to get a few 'horses' becouse of his abillity to measure quick changes of intake air temp a lot better than factory IAT which needs some period to cool down or to heat up. If i'm using this flange sensor instead IAT it would give informations of water temp, not about intake air temp and I'm sure I'll got less power on that way. It would give informations about hot air all the time, and the car for sure won't run as it should... That's my opinion.

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If I was going to change to the 20VT IAT I'd leave the original one where it is unplugged and install the 20VT IAT near the MAF or in the intake elbow, it would give a much more accurate intake temperature.

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