runnermedic

recently i started to research the net looking for some info about the proper way to swap the vafm of my 3vze,found some threads but info was not complete or well explained,so i pick all the important info.

fisrt of all
which one to look for?
well this is the complete vafm pinout

All 83-95 22RE and TURBO, 79-82 SUPRA 5MGE, 81-82 Cressida 5MGE, 84-89 3YE Van, 85-89 4AGE MR2 non S/C, 85-91 4AGE Corolla, 83-86 2SE Camry, 83-84 4KE Starlet
1= Fuel pump switch
2= Fuel pump switch
3= ECM (-)
4= IGN (+)
5= ECM (+8v)
6= VAF signal
7= IAT signal

83/84 Cressida with the 5MGE
1= Fuel pump switch
2= Fuel pump switch
3= ECM (-)
4= ECM (+5v)
5 Not used
6= VAF signal
7= IAT signal

83/84 Supra 5MGE
1= Fuel pump switch
2= Fuel pump switch
3= ECM (-)
4= ECM (+5v)
5= ECM (-)
6= VAF signal
7= IAT signal

this group can work in the 3vze

85/86 Cressida, 85 Supra 5MGE, 86-92 7MGE non-turbo Supra, 87-92 Cressida, 88-95 3VZE trucks(T100 as well), 88-92 3FE Land Cruiser, 93-94 1FZ-FE Land Cruiser, 91-95 2TZFE Previa non-S/C, 86-89 3SGE Celica non-turbo & turbo, 88-91 2VZFE Camry, 92-93 3VZFE Camry, 90-91 2VZFE Lexus ES250, 92-93 3VZFE Lexus ES300
1= Fuel pump switch
2= Fuel pump switch
3 Not used
4= ECM/PCM (+5v)
5= ECM/PCM (-)
6= VAF signal
7= IAT signal

what air cleaner box will fit?

it depends on where you want to mount it,but a celica or camry one will work well few mods needed,also the fj62 can work with a few mods.

which vafm to look for?
talking about the oem part numbers.

22250-62020-camry ,lexus v6
22250-74180-celica 3sgelc engine
22250-43230-cressida 2.8L
22250-43150-supra 5mg
22250-61010,22250-75020-land cruiser
22250-74100-previa non s/c

one more thing is that maybe this mod is not just plug and play at all some will need fine tuning the mix so you need to open the top id of the vafm to adjust the mix,in some apps you need to uncover the idler screw located in the vafm to properly set the desire idle rpms with out messing up the timing.

Did i miss something?
fell free to add some info or pictures,i will be adding some pictures later

this page contains all toyota vafm oem numbers
http://www.autoairflowsensors.com/index.php

88toyblackjack

Thanks for the info!

MudHippy

You were doing so well, up to this point here.
So, the "idler screw" you're refering to is actually called an idle mixture adjustment screw. And it isn't used to set the idle rpm, nor does it have any affect on ignition timing.

FYI, the idle speed adjustment screw is on the throttle body.


So what does the idle mixture adjustment screw have an affect on? Good question, allow me to explain. The idle mixture adjusment screw is for making minute changes to the air/fuel mixture at idle rpm. Its purpose is for very fine tuning of such. And, technically, you shouldn't be attempting to fool with it unless you have a way of monitoring the exhaust gasses in real-time. You'd also need to know the proper specifications for what the factory says is the correct level of richness/leanness desirable at idle rpm. Where you can find such specifications is beyond me. I've never seen any info on that anywhere, and would have no clue what would be appropriate in those regards.

What does this mean? Does it mean that you shouldn't adjust for idle mixture when installing a different size VAFM? NO, it does not. In fact doing so is just as likley to be required as the over-all mixture adjustment that's done by opening the top of the VAFM and tightening/loosening the spring that holds the vane/flap closed. Both are set at the factory for the engine that the particular VAFM was installed on. Neither is likely to be set correctly for any other engine you may be installing it on.

So what to do? Well, having adjusted both on my 3VZE's stock VAFM, I'll tell you how I went about it.

First, start with the over-all adjustment by opening the top cover and giving it a click or two in whichever direction you think will give you the desired effect. Loosening the spring will enrich the A/F ratio. Tightening the spring leans it out. All I can suggest is a bit trial-and-error as to getting that set where you'd like it to be. Personally, I was looking to go in the lean direction. I started with 2 clicks lean, then fiddled with the ignition timing and idle speed a bit to get it idling nice and smooth and at the prescribed idle rpm(800 +/- 50 for the 3VZE). Test drove it and liked how it performed. I wasn't done there though, just "testing the waters" you might say. I wanted to see how far I could take it in the lean direction. So I clicked it 2 more clicks tighter. Well, I couldn't quite get the tune I was looking for at 4 clicks lean. It wouldn't idle as smooth as I prefered, even with some minor ignition timing and idle speed tweaks. Drove GREAT, just didn't idle perfectly smooth. To sum it up, I ended up sticking with 3 clicks lean, and a satisfactorily smooth idle.

Next, the idle mixture adjustment screw. Now seeing that the VAFM on my 3VZE is the stock unit, and I don't have too many mods that could potentially affect the A/F ratio, I left this adjustment for a later date. But curiousity finally got the better of me, and I decided to fiddle with it to see what effect I could get out of it. With my intention being to see if, by ear(w/o special equipment to monitior the A/F ratio), I could adjust for a smoother idle. Again, through a good deal of trial-and-error, I was successful in doing so. I must state that this is a very tricky procedure, and takes a fine sense of hearing and a keen awareness of the particular behavior of the engine at idle speed. And the amount of turn of the screw is very small to get the desired effect. After much tweaking with it I was able to find a "zone" where I could hone in on the smoothest idle performance. This "sweet spot" ended up being within about an 1/8th of a turn of the idle mixture adjustment screw. More than 1/8th of a turn in either direction took me out of that "zone"/"sweet spot". Within a 1/16th of a turn put me right in the middle of it, and that's where it stays.

Bottom line:
You've got to know your engine well to go fooling with either of the adjustments found on the VAFM, stock or not, to get the desired effects. They're by no means something that you should take for granted can be adjusted in one particular way or another based on someone else's experience with their engine. Both are relatively fine-tuning adjustments, and should be handled by someone who's had atleast some minimal experience in basic engine tuning and/or is atleast minimally knowledgable in basic engine tuning theory.

Lastly, I can give you the advice a wise old man once gave me. He said to me this, "listen to that engine, listen to it very carefully, it'll tell you what it likes and what it doesn't". You've just got to develope an ear and a feel for what adjustments need to be made to any particular engine. Once you do, the rest comes pretty easy. It just takes a little time to aquire is all...

Or you can just spend a ton of money on special tools/equipment/dyno runs and tune-ups to maintain it to get the same effect!

RBX

I'm sorry if i am not reading this correctly, but you ARE saying 'use these VAFMs' and not the models above.

thanks

MudHippy

That's exactly what he's saying. However, I'm unable to verify if what he's stating is totally correct. But assuming that those particular VAFMs have the same pinout as the one for the 3VZ-E, they should work without wiring harness modifications anyway. Though he hasn't used the proper terminology to label the individual pins, nor are they all accurately labeled in regards to their true functions. Close enough so I know what he means atleast.

The 3VZ-E VAFM pinout is actually as follows:

FC = Fuel Pump Control(Fuel Pump Switch)
E1 = Engine Ground
Unused
VC = Voltage Constant/Control(Regulated 5V reference voltage from ECM)
E2 = Earth Ground(Sensor ground return to ECM)
VS = Voltage Signal(Signal voltage representing air flow to ECM)
THA = Intake Air Temperature Sensor voltage signal(IAT THermistor signal voltage representing Air temp. to ECM)

From the 93 and/or 95 FSM.

RBX

Thanks MH, i read your informative post.
I'm having serious issues with my truck, and my just get another VAFM from the JK to check against mine. before i buy a new/reman.

thanks

camo31_10.50

i got lucky and got a new aftermarket VAFM from my junkyard, guy replaced it, then totalled his truck about week later,

runnermedic

those stock numbers are from a group that i know they will fit with out cable or pins mods,those are the more commonly found if you go to a jy or ebay.

RBX

Thanks runnermedic. That's good stuff!

Asuarez737

so can i put one of those and install an intake to it?

MudHippy

Certainly.

Asuarez737

i got a weapon r intake but i kinda need help on how to do the swap of the vafm...i was trying to look for a way to bypass it but i have failed at that

MudHippy

Bypass? I don't know of any other way to do that than to install a stand alone ECU. That would be able to use a MAP sensor instead, which you could also install. Again, like the MAF conversion, big time $$$. We're talking $600-$900 range either way.

RBX

Asuarez737,
If you are referring to an ISR mod, do a search and you will get tons of information. In your case you have the intake, and just need to fit the VAFM to it...4 bolts and some type of coupler, maybe some silicone couplers...

Check out MudHippy's threads and i have some info in my build link in my signature as well

Asuarez737

i already have the coupler just the vafm flap hole is too small for it and the coupler sticks out a little bit

RBX

Sounds like you need a reducer coupler....
siliconeintakes.com
Post some pics of what you speak of.

Asuarez737

what im gonna do is get a 7mge afm nd install it...i dont have pictures but ill post some as soon as i can

MudHippy

I've read that the 3VZ-FE has the larger AFM made by Denso. There's only 2 sizes AFAIK.

Asuarez737

well heres a comparison of the 3vze vs 7mge https://www.yotatech.com/409801-post15.html

RBX

MudHippy is referring to the Camry AFM...3vz-Fe not the 3vze found on our trucks.

I may try the 3VZFE, since there are plenty at the local yard. For now i will stick with the Cressida VAFM i have, and dial that in.