The IAT sensor measures the temperature of the intake manifold. The ECM uses this sensor reading to set injection timing and adjust the air-fuel ratio. If the fuel mileage and power output of you engine seem low, some owners have found improvement in EGT, fuel economy, and power after cleaning carbon from the IAT sensor in at the rear of the intake manifold. Engine with exhaust brakes are particularly prone to IAT sensor fouling because soot is blown back into the intake during valve overlap. Smokingdiesel.com has an information page about problems caused by the IAT sensor.

The only tool you need is a 3/8" ratchet with a 6" extension and 13/16" socket.

The IAT sensor is found on the driver's side of the engine, almost at the back of the intake manifold.




Temperature
Resistance

30°
40K

32°
30k to 36k ohms

76°
13K ohms

77°
9k to 11k ohms

81°
6.87K ohms

122°
3k to 4k ohms

130°
4K ohms

167°
600 to 675 ohms

212°
600 to 675 ohms


Replacement Sensor:

Cummins PN 3408345

Dodge PN 05014197AA Sensor, Temperature (SEN, TEM)

 

Forgot what to clean it with. Only use carb or electronic aerosol cleaners on these sensors. Anything else will leave reisdue that will distorte the readings.

 

good point slick...thanks

 

Dont use carb cleaner

Electric contact cleaner is available at most parts stores and is the best thing to use.

 

Starting fluid (ether) will also work excellent.

 

for a stock truck...you don't need to do this till well past 100k most of the time...did the old 2001 at 85k and it was clean as a whistle. Do third gens have em?

 

Wondering the same thing.

 

Yes a 3rd gen has an IAT

and if you run a exhaust brake you should clean the IAT every 10k.............its amazing the difference

I cleaned my buddies at around 50k, he has no brake and yes it was carboned up somewhat......you could hear the diff in the idle before and after the cleaning

 

We always use MAF Sensor Cleaner

 

i checked mine yesterday and the little white thing at the end of the brass fitting wasn't there