corax

I already know about the '82 Supra AFM upgrade and how hard they are to come by. So I was talking to one of the techs at work with a lot of 22RE experience the other day and he remembered something about a first gen RX7 AFM. So I did a bit of research and found a few write-ups that say a Mazda 626 or MX-6 AFM is plug-n-play - one thread I found is here. I also found a write-up here where dude used the Mazda housing to make a Frankenmeter. A bit more research & I found A-1 Cardone giving this interchange for the AFM (helluva lot easier to find than a Supra from one specific year)
I also read that these alternate part numbers are supposedly valid on the AFM: 1971003420, E92Z12B529A, F20113210, F20113210A, E92Z-A, E92F-A, F201-13-210, 197100-3440, JE06-13-210A

So I spent some quality time in a junkyard recently comparing MPV, Probe & 626 AFMs to a stock '85 Cressida AFM (no Celicas to compare to, but I did snag the Cressida's throttle body for my Celica) - this included cutting off the black circuit board covers. The only obvious difference on the board is that the Cressida AFM uses a larger board under a differently shaped black cover and slightly different style contacts on the resistive strip. I ended up walking out with an AFM from a '91 Ford Probe (1971003420). I haven't plugged it in yet, but all the resistances check out OK per the tests in the '85 Celica manual.

So, my question is, does anyone know definitively whether this AFM is plug and play? And if the static tests are all OK, per the '85 Celica manual, it should be good to go, right?
BTW, the round end of the AFM measures 3" i.d. and the squared off air filter side is a perfect 2" x 2.5"

I also found this which would seem to indicate they are the same internally . . .
22RE AFM diagram (note the diagram in the lower left):


The only internal diagram I could find of the Probe's AFM comes from Megasquirt and looks identical to the internal diagram above (the red lines just show how to wire an IAT to work with MS PnP, ignore them)

toyota4x4907

Interesting. Couldnt you just plug it in ( or wire it to plug in) and test it?

corax

I guess I could, just trying to get an answer before I take the time to try . . .

RBX

^^^ is the plan to use this on your 7mge?

MudHippy

It should work, but see below...
So, don't be too surprised if you have to do the same.

corax

Nope, this is for the Celica -> Celica pics

I can ignore "intermittent" as long as it doesn't kill drivability. Maybe I'll try to get this thing swapped on after work this week yet . . .

wyoming9

iTrader: (1)

Wow the Celica pictures look about like my driveway after the rain.

The things people do for fun.

corax

so far I have 10 miles/30 minutes through highway and stop/go traffic on the Mazda AFM with no problems . . . a few more days & I'll call this mod a winner

Robert m

iTrader: (2)

i dont suppose this thing bolted up to the stock air box did it corax?

corax

Nope, as much as I hate cone filters, for now I'm using an adapter that I got off ebay and an old K&N that I had laying around

Robert m

iTrader: (2)

any updates? hows this AFM doing?

Crapple21

Did you use the probe one or the Mazda afm?

corax

100+ miles and several hours in stop/go traffic with no check engine light or drivability problems. When I installed it I also moved the toothed dial about 6-8 teeth counterclockwise, or richer, to account for the bigger opening - this was a guess & I haven't had a chance to actually tune it properly. I didn't notice any huge gains in performance, it might rev a bit higher than it did before, but I also haven't gotten a chance to install the bigger throttle body yet . You can install a big AFM, but the throttle body is the next "choke" point in the intake tract.

. . .mainly because it was the cleanest looking one at the yard. Anything on the interchange list above should work fine.

corax

final update:

Working fine, no drivability problems, no check engine lights after well over 1,000 miles and many hours. I feel like I lost a tiny bit of low end torque, but I never really bothered to actually tune it yet . . . just kinda set it 6-8 ticks richer (looser spring). I give this mod thumbs up.

corax

got asked a question, thought I'd post it up to share
On that note, 2 sources (besides LC Engineering) for a larger throttle body (note: stock throttle body is 55mm):
- places like Max Bore that take your throttle body and bore it out before installing a new throttle plate, maximum they can go on a stock throttle body is 58mm which should be more than sufficient and makes it a simple plug & play operation
- 60mm Cressida/Supra 5M-GE throttle body (write-up) - not plug & play, tougher to find in junkyards lately, be careful which style throttle linkage is on the throttle body when picking one up

ptr1968

For the ones still searching for this mod. I can confirm the AFM of the Mazda MPV 1995 3.0L non turbo works (as the supra '82. Plug and play)

I did an CO test at a workshop with the original 22re 1991 afm, it was 0.8%.
After installing the Mazda afm it was starting as normal, also testdrive good, quite a bit more power at lower revs.
Then drove to the workshop, had it tested; 0.6% CO at idle, 1.1% at about 2500/min.
I have no cat on this car
I didn't have to adjust the tension of the afm.
Its running great.
I did modify the original airfilter housing so it could fit both the afm's, not a difficult mod. check foto's at;

https://picasaweb.google.com/ptr1968/AFMXL22re

video:
Peter

Vic4100

[QUOTE=ptr1968;52284390]For the ones still searching for this mod. I can confirm the AFM of the Mazda MPV 1995 3.0L non turbo works (as the supra '82. Plug and play)

I did an CO test at a workshop with the original 22re 1991 afm, it was 0.8%.
After installing the Mazda afm it was starting as normal, also testdrive good, quite a bit more power at lower revs.
Then drove to the workshop, had it tested; 0.6% CO at idle, 1.1% at about 2500/min.
I have no cat on this car
I didn't have to adjust the tension of the afm.
Its running great.
I did modify the original airfilter housing so it could fit both the afm's, not a difficult mod. check foto's at;

https://picasaweb.google.com/ptr1968/AFMXL22re
o: e

Hello ALL, in terms of Mazda AFM sensors fitting 4runner 22re, I was searching for a New AFM sensor here in Brazil and after checking PNs from Toyota and Denso I realized there is a Denso AFM used for mazda with the same PN which in some websites they also do recommend to 22re engines. So, could you please confirm pra have any knowledge If Denso AfM sensor PN 197100-4090 fits Toyota 94 4Runner 22re Engine? Specific sites, in Brazil and also ebay US reffers denso PN 197100-4051 and also 197100-4090 as used on 22re. Really appreciate your help!

ptr1968

Yes it can fit, only the side with the airfilterbox needs a bit modification, the rectangular is a bit larger

Vic4100

Thanks! I did the test on the car with mazda AFM and the code 31 on check Engine light appeared. basically, according to what I Saw, code 31 means issues with Vc PIN (#5) and also when I did the resistance tests the e2-Vc test has Just 4 ohms instead of 100-300 ohms. So, my doubts are now related to the AFM: does this AFM mayba van have the PIN sequence like 6cyl AFM (e2 on PIN #3 and #5)?

Damn!! This subject is harder than i though!! Lolll