- Joined
- Jan 13, 2019
- Messages
- 1,378
- Reaction score
- 806
- Points
- 113
- Location
- Pennsylvania
- Vehicle Year
- 2004
- Make / Model
- Ford
- Engine Type
- 3.0 V6
- Engine Size
- 3.0
- Transmission
- Automatic
- 2WD / 4WD
- 2WD
- My credo
- My world is filled with stuff that needs to be fixed
OK, I admit it - I read about cleaning the MAFS and snickered a bit. But then I read a little more and realized it made sense, so I tried it. I'm pretty surprised in the difference it made in throttle response. I swear the transmission is responding differently too - more willing to kick down and perhaps holding gears longer.
It makes sense too. The hot wire MAFS works by passing an equal current through two identical pieces of heating wire. One is located in the air flow and one is sheltered. When air flow passes over one, it is cooled and the resistance changes. By comparing the voltage across the two you can directly measure the air flow.
If the one that is supposed to be in the air flow gets coated with stuff, then it isn't cooled the same. It becomes like the one that isn't in the airflow, so there isn't much signal and the computer sees less airflow than is there. This will change the fuel mixture in open loop modes, and might also change the load calculation for shifting.
It makes sense too. The hot wire MAFS works by passing an equal current through two identical pieces of heating wire. One is located in the air flow and one is sheltered. When air flow passes over one, it is cooled and the resistance changes. By comparing the voltage across the two you can directly measure the air flow.
If the one that is supposed to be in the air flow gets coated with stuff, then it isn't cooled the same. It becomes like the one that isn't in the airflow, so there isn't much signal and the computer sees less airflow than is there. This will change the fuel mixture in open loop modes, and might also change the load calculation for shifting.