Adjusting the Air Flow Meter

[wontonjohnny]

hey i found this site... do you guys think it will work??
http://www.4x4wire.com/toyota/minutemods/afm/

also how about that trick where you put a resistor on the end of the air temp sensor? does that work??

[EKam]

It'll work, but without the basic understanding on air/fuel there's no point in doing what it's written in that page.

It's just instructions on how to adjust your AFM without using something like an SAFC.

[wontonjohnny]

anyone else?

[Luc]

I've seen that modification from the Celica All-Trac site before. The MAF from then was able to be adjusted, it's possible on the 3VZ-FE also, but how much gain will you see from a heavier car compared to a Celica? If you want to put a resistor into the airflow wire to knock some voltage or current down to the ECU, go ahead, and run the risk of perhaps ruining something else. What will that gain, 1/10 of a second? The ECU isn't as stupid as the people who believe these cheap mods will work.

[Ratko]

those resistors or potentiometers just alter the voltage coming from the MAF sensor basically lying to the computer that there is colder or more air coming in then there actually is.

what happens?

the computer believes that its gonna get the air that the MAF is lying about and adjusts the fuel and timing accordingly... then what happens when it doesnt get that air? a rich condition.

not only will you lose power and waste gas, but you will foul up your O2 sensors and reduce the life of your catalytic convertor.

it does no good, only harm. UNLESS of course your car is running lean and there is nothing the ECU can do about it so in that case it is a solution, but what you dont understand is that the ECU is your friend and if you acutally knew how well it functioned, you wouldnt even waste your time reading about this useless mod and instead you would try and figure out ways to get more air (compressed ) into your engine and let the ECU and MAF do their job.

[rezzle]

I tried that when I added a supercharger to enrich the mixture at high boost.

I also have a broken piston sitting on my desk and am using it as a paperweight.

The air gas mixture of 14.7% O2 that your ecu tries to maintain when driving is ideal for gasoline and if you do any mods to the air fuel system it may be wise to buy a programmable/mappable ecu. If you do decide to fiddle with your airflow meter make sure you mark it WELL so that you know where the original settings were.