How To: Clean the Mass Air Flow Sensor

Yes, there is a SpyderMagazine article on this. But, I thought, it assumes you already know WHERE the Mass Air Flow sensor (MAF) is. So I thought I could make it more simple. N00b-proof, if you will. Hey, I’m learning too–may as well share the process.

The engine should be cool for this procedure, or you are likely to get burned.

First, you need to remove the ECU fuse or the positive battery terminal clamp. This allows the ECU to “reset” itself.

Seen here

What you’ll need to clean the MAF:MAF cleaner (the magazine article says choke & carb cleaner is OK too, but I just bought the dedicated stuff), Phillips head screwdriver

So, pop the hood and let’s see where this puppy lives.

Oh! There he is! (blue arrow)

Let’s get a little closer. Now he’s boxed in.

OK, now we know where he is. Let’s get started.

There’s a tab on the top of the MAF sensor wire harness. Push the tab down and pull the harness away from the MAF

There are 2 Phillips head screws to be removed, as indicated by the blue arrows. They’re little, so don’t lose them when you remove them!

Loosen the screws:

Remove the screws and put them somewhere safe.

Now the MAF will lift out:

You’re ready to clean it.

Here’s what you’re aiming for–the platinum wires in there. They can be damaged, so don’t put the spray nozzle directly in contact with them.

Spray the cleaner into the MAF to spray the platinum wires.

There is a little rubber O ring (blue arrow). The SpyderMagazine article mentions you might want to remove it on the chance the cleaner might make it brittle. I didn’t see the spray getting much on there, but you can also spray it with the MAF at an angle so the spray doesn’t get near the O ring.

Put the MAF back in the way it came out (there’s only one way it will fit), and tighten the screws.

Reconnect the MAF sensor wire harness by pushing it back into place.

…and VOILA! You’re done. Go have a beer, and pat yourself on the back for a job well done. Or better yet, take the Spyder for a drive, THEN have that pat and beer.

This documentation in no way replaces the Toyota MR2 Repair Manuals. The purpose of this content is only to provide supplementary information to fellow MR2 enthusiasts. Midship Runabout and its contributing authors will not be held responsible for any injury or damages that may occur as the result of practicing any of the methods or procedures described within this website. Article and photo submissions are property of the contributing author.

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