Polish your MAF sensor housing

Another project I finished over the weekend was sanding down and polishing the MAF sensor housing. The two pieces of metal that sandwich the MAF itself. This takes time and patience, and it wont be a fast process. This is basically for anyone wanting to add a little bit of polished metal under the hood. I also smoothed down the inside of the housing to aid in airflow.

Tools Needed:

  • *I had an air compressor and grinder at my disposal and that made it a lot easier at the beginning.
  • Dremel with sand paper attachments/wheels
  • Sandpaper or wheels of various grits:

    • 320
    • 1000
    • 1500
    • 2000
  • Screw drivers (flat-head/Phillips)
  • Rubbing compound
  • Polishing compound

Step One.
Remove all electrical plugs on the intake and MAF

Remove Air Intake lid along with the boots attached to the MAF housing. There will just be two bands that you will loosen up with a flat-head/Phillips screwdriver and work the boots off.

Next you’ll have to remove the sensor from the two metal pieces. There are 4 different bolts that hold this together and they are a star bit and not able to specify size but will edit this later with the correct size.
Once you remove the 4 bolts, you’ll remove the sensor(middle piece) from the housing. BE EXTREMELY CAREFUL NOT TO DAMAGE THE THREE EXPOSED WIRES ON THE SENSOR. Otherwise you will be buying a new MAF. Lay it aside in a safe location and now you can see the task ahead.

There are two rubber seals that you need to remove as well just to prevent a chance of damaging them.

This is what you should have.

Now the fun part.

Fill a bucket up full of water and add a little bit of soap. I always like to use soapy water anytime I sand just to lubricate and keep from digging too deep with the sandpaper. It sucks having to sand and sand to get deep scratches out. Take your air tool or by hand, your heaviest grit and start working on the texture of the brackets, occasionally dipping the bracket/sandpaper in the water. You will get messy but it’s worth it. (I only used the air tool/grinder to knock down the rough surface and texture and then went to sandpaper by hand)

Once you have all of the texture and molded high spots sanded fairly smooth around the outside, you’ll start to work on the rest of the bracket. There are some nooks and crannies that you’ll have to work into with the dremel and by hand but like I said, it just takes patience.

Use the dremel on a low speed to help get into the tighter places but be very careful as a dremel can take a lot of metal very fast leaving a nice groove that will take a lot of sanding and extra work to get rid of.

After you have the bracket roughly sanded down, move on to a lighter grit, just do the same thing and work out the scratches from the rougher grit until you have it smoother.

Then move on to the 1500 grit and here is where you’ll really find out if you have some deeper scratches that you need to address. If there are, just move back to a little rougher grit(but not too rough otherwise you’ll just create more deep scratches) or keep with the lighter grit to try to get rid of it.

When you feel happy with the result and feel of the surface and there are no longer any deep scratches, run over the metal with a 2000 grit sand paper to really smooth it out, rubbing compound and then polish and here’s what you have. You’ll just have to judge it for yourself and work on it until you are happy with it.

Some people choose to de-screen their MAF housing while it is out, I chose to leave it in as the theory behind having it is to straighten out the air so the MAF sensor itself will have a more accurate reading. Some people have zero problems after removing it but some guys have nothing but problems. Do this at your own risk. Just repeat the same process for the other side and be careful not to damage the screen, unless you choose to remove it.

Finished product off the car.

I’m currently working on the throttle body as well so that will be coming soon.

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