Because the people in the gasser forums are mostly idiots.


My member just posted about his new manafolds he got, and they say he should run true duals on them, but he has OBD2, so more o2 sensors. They want him to buy this kit to fool the o2 sensor.
I'm sure its just a reistor you plug in to do so.
So, the question is, what resistance to throw in there, and what pins to use?

I really need to fool my o2 sensor also.

 

What is the engine and vehicle? How many sensors are on it now?

FWIW: You can only add a o2 simulator on the rear sensor(s)...down stream of the cat. The up steam sensor(s) adjust the air fuel ratio and must be kept. Only 2 sensors are needed even for duals, just forget about the other side.

 

it won't be resistors cause O2 sensors create voltage. Not really sure how to fool it. I don't like O2 sensors

 

hmm a good question, the "foolers" go on the post cat sensors,they are in fact basicly a resistor. the down stream sensor does not vary its voltage unless the cat is either dead or gutted at which point it will create the sin wave that causes the check engine light. the foolers are a little more involved then just plugging a resistor inline. the must be able to keep the voltage at teh specified factory level and elminate the wave created by the unburned fuel passing over them. it shouldnt be too hard to build one but you would first need the actual specs for your engine then get the supplies to build it.

 

Yea, he's got that calli 3 cat deal, and they said he needs to get a fooler basically for the final one.

And for anyone EVER saying just plug an o2 sensor into one side of true duals. that is tottaly f-in assinine. Your only getting a reading from one bank, and any engine, chebby, dotch or ford will never read the same on one bank as the other.
If the other side is messing up, you'd never know. So no adjustments to fuel/air would be made. =)

I figure i can fool the PCM with mine and my single OBD-1 o2 sensor into thinking it needs to run x fuel. But just how to get the signal.

As for voltages.
Voltage is probably passed down the wire, and the sensor creates the reistance. Thus varrying the voltage.
If there is voltage involved, there is resistance involved. To create current, you need resistance, to change voltage, you need to change output, or add resistance.
To harmonize voltage, you need to add a capacitor.
I immagine some sort of resistor/cap set up is all the thing they are selling is.

However, all 351's with obd2 and etc, would all have the same voltage, so just need to figure out how much that sensor is supposto read. Perhaps the haynes manual has a "sensor test" readout for it, and thats basically the restance you need to adjust for?

 

Read this: You can build your own
http://www.mkiv.com/techarticles/oxy...sor_simulator/

 

Thanks jim.

 

if you want more fuel then just turn the pressure up to the injectors
you can always use the old fox body mustang trick.....