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IAT is located beside the throttle. This engine does not have a mass air flow sensor the computer uses the inputs from the IAT, MAP (Manifold Absolute Pressure) sensor and the RPM reading to determine what the air flow reading would be.
in 1990 LS400, the amp is only for the sub, its located between the fuel tank and trunk liner. you can reach it by removing the trunk liner which cover the fuel tank right behind the rear seat. hope this helps
I can tell you that the mass air flow sensor is up front on the drivers side of the engine. It will be located on top of the round black tube that runs behind the air cleaner box. The IAT, or the IAC valve should be located closer to the engine towards the end of that same tube. That's where the throttle body is located. I would suggest going to your local library and referencing a Mitchell or Chilton repair manual if there is one available for that new of a model.