IAT resistance for the 3VZ?

[thaharlequin]

Anyone know what this kOhm (I'm assuming) range is? TIA.

[Mike Gerber]

I don't think many people will know that spec off the top of their heads, however, there are both generation 3 and generation 4 Toyota factory service manuals stickied at the top of the General Camry Discussion forum. They are available for free downloading. The spec should be in there.

Mike

[Unco]

for the 3VZ engine you'll need to download the lexus es300 manual

[thaharlequin]

Yup, it's in the Lexus manual, thanks!

[ASG14]

Ok, I think you mean IAC?

Go to: http://www.**********s.com/camry/

Download: 1993_Lexus_ES_300_FSMs.zip = 1993 ES300 FSM ------------------------- [43.3Mb]

Open: ENGINE

Page: 211

[thaharlequin]

Nah, the IAT (Intake Air temp) sensor. It seems like it's the same thermistor as the ECT sensor.

[ASG14]

Yeah, realized that after thinking of the other thread, haha. Sorry about that. Hope your able to figure out the problem easily. Good luck.

[thaharlequin]

Np! It's actually, not a problem, I just want to see a ~40mpg round trip tank, and I think if I can somehow get the ECM to see higher IATs (i.e. lower resistance) then I can have control of the mixture and run it a little lean. I have a feeling I'll have to keep the sensor unhooked and use a couple 1Kohm pots so I can adjust the average mixture for each drive depending on the temperature, but I'd like to have something where I could drop the resistance by ~.5Kohm across the board, and lean out the mixture based on the signal, but I think I can base it on the pot alone too, especially in the summer.

[ASG14]

Actually, if you know someone that is REALLY top notch at tuning a stock ECU, you may be able to pull that off without looseing performance. My friend has a '94 V6 Camry and was able to bump the HP about 40 more, PLUS get 34MPG under regular highway driving. That may be a better way to go.

~Adam

[thaharlequin]

I'ma bump this again. Does anyone know what the relationship between outside temperature and IAT temperature cruising on the highway is?

[thaharlequin]

Hmm... Tuning the stock ECU? I wasn't aware we could reflash these puppies. I'd have to be able to flash it back to stock for smog, but that would be the perfect solution.

[thaharlequin]

Or... Here's a post on fiddling with the MAF to lean out the mixture, and it seems so easy. Does the 3VZ-FE have this option?

[ASG14]

What my friend did is completely change the Air/Fuel delivery on the car, and that is how he got it. I dunno how, but I know it took him a while. IF you did do that, I'd actually suggest to get a 2nd ECU, stock, you swap it for smog. If you put it back to stock, you'll have to completely get it retuned.

Originally Posted by thaharlequin

Or... Here's a post on fiddling with the MAF to lean out the mixture, and it seems so easy. Does the 3VZ-FE have this option?

That stuff is above my head right now, haha. I;m trying to learn about that type of stuff. Remember too, that tire pressure has a lot to do with gas mileage. Most people forget that.

[thaharlequin]

Swapping would be the best option. So far I get ~33-35mpg under slow highway driving with no mods and my tires at 50psi. I figure I've gotten to the limit of what I can do with driving habits, so now it's time to start leaning her out. And I found the AFM mod, so I'm hoping for 40mpg!

[ASG14]

Man, if you can get that, PLEASE let me know. I've been able to get 30.1mpg from my '96 1MZ V6 once. thats still the top.