Im gonna try this mod but there has been too much confusion here.
Kerma posted:
And to put a 2.2k ohm resistor in series (inline) with ONE of the wires for each sensor. But people are getting CEL codes if they choose the IAT pin 1 (brown/blue) wire. And non-starts when using pin 4 (brown/blue) on the FTS.
Why?
Cause:
http://www.geocities.com/tech4tdi/pages/map.html
Pin 1 is the ground wire for the MAP/IAT sensor. People forget that it is a shared sensor. So if you put a resistor on pin 1 (brown/blue) for the IAT sensor, not only do you lower the temp reading, but you also mess up the "Manifold Pressure" reading (MAP).
I don't have a wiring diagram for the Fuel Temp Sensor (FTS) but I think it is safe to say that the FTS harness has more than just a temp sensor. So which one do you think the ground is? Probably the (brown/blue) again right?
This is what Rub87 was saying about not cutting the ground wire.