The map sensor found on all 98.5 and up Cummins equipted trucks is very important as your fuel delivery rate is partially determined by the MAP.The MAP sensor is located on the drivers side of the motor just above the lift pump and rearward of the fuel filter side of the intake manifold,Its just below the IAT sensor. The MAP sensor reads the manifold air pressure and sends a signal to the ECM to regulate fuel timing,fuel control, As air pressures vary the sensors resistence changes the signal to the ECM. It has been my experience that if an exhaust brake is used that the MAP can become fouled with soot and the sensor becomes inaccurate, I personally clean mine every 10k miles with carburator cleanor, The torque spec on the sensor is 10 ft. lbs.this makes the allmighty Cummins happy and idles better as well as better overall performance including MPG.

Cheers, Kevin

 

Kevin,

The MAP is at the same level as the IAT on my 2002 but otherwise as you state. Further, I don't use carb cleaner but instead sensor cleaner.

 

electrical contact cleaner...

 

good input fellas thanks

 

im pretty sure its manifold absolute pressure

 

could very well be.........makes sense

 

this is also where you hook a boost fooling module.

 

Here you go a write up

Manifold Atmosphere Pressure Sensor
The MAP sensor is installed into the rear of the intake manifold. The MAP sensor reacts to air pressure changes in the intake manifold. It provides an input voltage to the Engine Control Module (ECM). As pressure changes, MAP sensor voltage will change. The change in MAP sensor voltage results in a different input voltage to the ECM. The ECM uses this input, along with inputs from other sensors to provide fuel timing, fuel control and engine protection. Engine protection is used to derate (drop power off) the engine if turbocharger pressure becomes to high.

MAP Sensor Cleaning & Location
This cleaning process is normally for Dodge Cummins that have exhaust brakes installed. But there has be a few reports of MAP sensors being dirty without a exhaust brake install. There is no maintenance schedule for cleaning the MAP sensor. If you do have a exhaust brake I suggest every oil change you clean the sensor. I clean mine every 6,000 miles and do a oil change at the same time.

Ok. first thing when need to know is where is the MAP sensor located at. It's on the driver side of the engine just passed the fuel filter.
Now you need the proper tool to remove it. You need a 1-1/16" deep well socket to remove the MAP sensor. Also your going to need a 3" extension. Preferably 1/2" drive.
Here is what the sensor looks like when its dirty. Now all you got to do is give it a few sprays of carburetor cleaner to remove the oily coating.
Now that they are cleaned. Just reverse the process to install them back in the manifold.