A MAP Sensor (manifold air pressure) and a MAF Sensor (mass air flow) are two different things and neither of them require maintenance. A MAP is located in the manifold and measures vacuum, a MAF is located in the air stream after the air filter and measures air "flow". The MAF has an element in it that is exposed to air. This element would collect debri that would then insulate it from the flowing air therefore effecting its accuracy. The result was a sensor that "told" the ECM/PCM that there wasn't as much air entering the engine as there actually was. The computer would then decrease injector pulse width (reduce fuel) and therefore restrict engine power. This was especially felt at throttle positions above 50% or so, often times the engine would be stronger at half throttle then it was wide open. This would also fool the computer into as incorrect altitude adjustment as a technician could tell by the calculated barometric pressure readout.

Again, zero maintenance on a MAF is needed (and most of us don't have them anyway). Yes, I do still see dirty MAF's in practice but it's rare. I also see MAF sensors that have become damaged by cleaning, especially with chemicals that leave a residue behind.

I've never heard of a MAP sensor needing or being clean in any way. In fact, some MAP sensor are mounted remotely (mostly older vehicles). And one last thing.... some vehicles also incorporate an intake air temperature sensor in the intake tube between the air filter and throttle body, but vehicles with a MAF often incorporate the temperature duties.

 

Owners who use an after market " oiled " filter element, & have a MAF sensor, may need to clean the element..
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Well, judging by the way that the intake tubes are looking(very OILY) and that is just befor the throttle body, somthing is getting (oily) 1 tube from the left side and one tube from the right, just don't know what to think... thanks for the info.

 

MAP stands for manifold absolute pressure and is not the same as a mass air flow sensor.