Question about 1999 Pontiac Grand Prix

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Po113 i.a.t sencor 1 high output

P0113

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The Intake Air Temperature (IAT) is along the intake housing between the throttle body and MAF sensor. The wire harness to the IAT is small consist of just two and the sensor it self is not expansive at Auto Zone or any large Auto Parts store. Check the wire harness first to see if it was un clipped or the wire broke.
The IAT works by measuring the temperature going in to the engine sending signals to the ECM to keep the air fuel ratio to 14.7 to 1. As the temperature drop the air density rises and more fuel is needed to keep the 14.7 to 1 ratio.
With your IAT reading P0113 which is no reading, your car is running on a given default which would think the engine is running like it's winter time so your fuel will be bad and you may get a miss fire from time to time as the timing will be advanced and detonation may occur which is bad.
I hooked up a 10K ohm potentiometer which i bought at Radio Shack (The Source in Canada) to my IAT sensor so i can control the temperature i want the ECM to read. If i want to save some money I ****** the timing by turning up th ohm to make it seam like to the ECM that it's 185  degress fahrenheit and it takes 2 to 3 degrees total timing out and shortens the fuel injector pules.
If i want to more timing and longer fuel injector pules i turn down the resistor reading from the potentiometer and the ECM thinks it's minus 20 out side. The performance goes up and the fuel economy goes down but it's a lot for fun to drive when you gain an other 15 HP.
Good luck and hope this helps.

Posted on May 28, 2009

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Check your air filter first to see if it is dirty.
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P0303 indicates a misfire on cylinder 3

I believe the IAT is built into the MAF sensor located in the air snorkle and helps regulate the air/fuel mixture. Also concentrate on cylinder 3 looking for problems such as injector, wiring, etc.

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There isn't just one reason why these codes came up. A scan-tool is needed to confirm live data and to run some tests to see if these codes are true. some codes come up because something else has malfunctioned.
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You should have about 5V coming into the sensor and around 1.5 to 3.0V(depending on the temp) leaving it.

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