The dead horse rises...

[4RunninElgin]

Ok y'all, a few years back, I blindly dumped in to the C.A.I. before doing my research but at the same time did the exhaust/cat as well..(shoulda done a snorkel).. I did notice a difference btw but I also do a lot of highway and back country road driving so I think I utilize the "benefits" ....before and after the Runner was burning a little rich. I was digging around on the makers website and found an interesting suggestion..... I've looked through the threads and have only seen posts pertaining to the Gen3+.... I'm wondering if anyone has ever done this and if it did anything to help....kinda on the important side since its the last year it has to pass emissions....pretty confident in the vacuum line and timing area....any and all input appreciated


Adjust the Mass Air Sensor


The following adjustment can be used to richen or lean the air/fuel mixture from the factory setting. The adjustment could be necessary when using the FilterCharger, Big Bore Throttle Body or other EFI modifications. It should never be performed on "stock engine".

The Mass Air Sensor is found on top of the air cleaner canister. The sensor is an aluminum housing with a black plastic lid. Cut the silicone seal holding the black plastic lid in place and remove the lid from the housing.

To adjust, first mark the original location of the hold-down clamp on the gear wheel so you can return to the stock setting if necessary. Loosen the clamp screw and rotate the gear a few teeth as necessary - normally 3 to 5 teeth. Clockwise leans the mixture, counter clockwise richens the mixture. After the adjustment, make sure you establish a good silicone seal when replacing the top plastic lid. Moisture can destroy the sensor electronics.

 

[flyinhawaiian01]

Hell, I've done that on both the truck and my '85 supra many, MANY times!

In fact, I've had to adjust it, 2 teeth at a time, while trying to pass smog several years ago in Oregon when I lived there! Nothing like driving to DEQ, run smog, fail, drive to parking lot down the road, turn two teeth, head back, repeat 8 more friggin' times until it actually passed!

Here's the trick to doing this "mod"...

1. use an x-acto knife to cut the seal. Run it as close to the metal as you can, rather than the plastic cover. If you cut it well enough, you will not need to re-seal it back again, and the cover will very tightly snap back in. Use small flat tip in one corner to pop it back off again.

2. Do NOT loosen the Philips screw in there! Use a #2 flat tip, and put it in between the gear and the side of the screws housing (going by memory here, not positive that's where you put it), you can then just turn the the screwdriver and it will move it one tooth at a time while it moves the wire stopper that keeps the gear in place. (I'll have to do some photos of this some day, or maybe a quick video of the process)

3. Before you do any of this, MARK THAT GEAR AND HOUSING SO YOU KNOW WHERE STOCK SETTING IS!!! There is no way to figure it out afterwards!!!

4. Just go 2 teeth at a time! Check both idle and highway speeds and everything in between before you move it again. Supra guys have done 33 teeth on theirs (with turbos) and have found that you may get it to run well at higher rpms, but it will not idle well at the bottom end from it being too tight as it really restricts air (when you're leaning it out).

5. Get yourself, at the very least, a cheap a/f meter like the one from Split Second. You may feel it gets a lot stronger when you lean it out, but that's not necessarily a good thing! Too lean and you will burn those pistons and valves up in quick order!

Now, when you're ready to move to the next stage, drop larger injectors in, get a 7MGE AFM and re-tune it for a good, stoichiometric a/f, then see how much that engine will wake up!

Getting my parts together right now to do this very thing on my 22re. Supposedly gives you a nice boost in performance, and will even get better gas mileage if you can stay out of the fun pedal on the highway!:wink2:

 

[4RunninElgin]

Wow!

Thanks! That's super! I was starting to loose hope on any feedback! Feedback I got! That's some very good and useful information! Much appreciated! The way they word it, it almost sounds like this mod is a must after the installation of their CAI and straight flow exhaust. I'll tinker with it (along with a few other things) over the weekend and check in.
Many Thanks!