Mass Air Meter Modification
The mass air flow sensor (MAF sensor)
Step One: Disconnect the MAF wiring harness and remove the stock
air box from the (black) air intake tube.
Next, loosen the clamp and remove the 3 screws that hold the MAF in place.
Once the MAF is off the air box remove the MAF sensor using a anti-tamper
torx bit to remove the two screws that hold the sensor in place. Be careful
not to damage the wires while removing the sensor. Lay the sensor in a
safe place and do not touch the small wires. Also remove the two anti-tamper
torx screws that hold the backing plate to the center support inside the
Step Two: Place the MAF in a vice being careful not to damage
the aluminum housing. Using a hack saw cut the center support out. Make
one cut just below the sampling tube and the other about one inch from
After removing the center support grind the excess metal away using
a die grinder and metal bit.
Be careful not to damage the sampling tube while grinding the metal away. Once you have finished removing the metal clean up with water and or brake cleaner. Next, you will need a drill and a NEW 15/32" drill bit. Preferable is a drill press for more accurate drilling and use some oil to help the drill cut through the aluminum.
If you have to use a hand held drill (not recommended) let the drill bit guide your drill into the sampling tube and don't try to force the bit down.
Step Three: After the MAF body has been cleaned up using brake
cleaner check for any burs in the sampling tube and file them away.
Next, using a file round the sampling tube opening smooth so the air has a better transition. A chain saw sharping file works best. After all work is done to the MAF body clean with brake cleaner and reinstall the MAF sensor in the body. Make sure you insert the black rubber O-ring back into the MAF body before installing the sensor. Do NOT reinstall the sampling tube backing plate! Hand tighten the torx bits down to about 5ft-lb (don't over tighten).
Reinstall the MAF back into the air box, then install the air box back into the car and reconnect the MAF wiring harness. Check all clamps to the intake tube and start the car.
For the best flowing intake kit on a SC check out the 80mm Intake Kit. This kit is a direct bolt-on to any 89-95 Thunderbird SC.