How to Modify L98 Mass Air Flow (MAF) Sensor
WARNING
1. The sensor wire is FRAGILE, so handle the MAF with care..
2. NEVER run the engine without an air filter in place once the MAF screens are removed.
Backgroud
The MAF end screens and internal heat sink fins limit maximum air flow.
529 CFM - max. flow rate stock
711 CFM - max. flow rate with screens removed
750 CFM - max. flow rate with screens and cooling fins removed
Reference - TPIS "Insider Hints", pp 10.
Preparation
1. Disconnect the tubing connected to either end of the MAF.
2. Lift the MAF slightly and disconnect the signal/power from it.
3. Carefully but firmly clamp the base in a vise.
Remove End Screens
There is a cap glued to either end of the MAF that holds the screen assemblies in place.
1. Locate the groove separating the end cap from the MAF body.
2. Frimly run a sharp knife blade around this groove till you hear a crack.
3. It may be necessary to use a thin screwdriver blade and the knife to crack the
remainder of the glue that holds the end cap to the MAF.
4. Remove the end cap and use the knife point to pry out the screen ring.
5. Repeat for the other end cap.
Remove Cooling Fins
Within the MAF body there are 7 Al cooling fins projecting from the heat sink base and
a central tube which contians the delicate sensor wires.
1. Carefully cover each end of the center tube with duct tape to prevent accidental
damage to the sensor..
2. Insert a round silicon-carbide hack saw blade through the MAF body.
3. Cut each heat sink fin off as close to the base as possible. Use care not to scuff the
inner surface of the MAF body.
4. Remove the hacksaw blade and use a Dremmel to smooth the fin remnants..
5. Clean all debris and dust from within the MAF body.
6. Remove the duct tape that covered the center tube.
Reinstall MAF
1. Remove the modified MAF from the vise.
2. Carefully reattach the electrical cable to the MAF connector..
3. Reattach the front and rear air ducting and tighten the two clamps.