Blaze
04-04-2004, 10:22 PM
Hey Guys:
I’d like to better understand how the computer interprets the signal from the second O2 sensor. Specifically, I’m looking for techies with factual information, not hearsay or hypothesis.
Sorry if that sounds harsh, I don’t mean it to be. I’ve been asking a lot of questions on this subject and the answers have been all over the board.
I’m considering getting a cat delete pipe with an O2 sensor emulator chip. From what I have gathered, this chip will send a static signal back to the ECU that everything is AOK (ie no need to make any corrections to the fuel curve).
I thought that sounded pretty dangerous. My understanding is that the second sensor’s readings are evaluated against the first in order for the computer to make appropriate fuel corrections. Tampering with the sensors might cause any number of issues; generally all bad.
However, the other day, I was speaking to a tuner from a local shop who assured me that the car only requires the reading from the first O2 sensor to make it’s fueling decisions. The second sensor is not really involved. He further stated that the only reason the second sensor is there is to verify that the cat is doing its job. So if the computer gets a reading from a chip that everything is good…no harm, no foul.
So the question I have again is: ‘What is the computer doing with the second O2 sensor readings?’
Thanks in advance.
Jason
I’d like to better understand how the computer interprets the signal from the second O2 sensor. Specifically, I’m looking for techies with factual information, not hearsay or hypothesis.
Sorry if that sounds harsh, I don’t mean it to be. I’ve been asking a lot of questions on this subject and the answers have been all over the board.
I’m considering getting a cat delete pipe with an O2 sensor emulator chip. From what I have gathered, this chip will send a static signal back to the ECU that everything is AOK (ie no need to make any corrections to the fuel curve).
I thought that sounded pretty dangerous. My understanding is that the second sensor’s readings are evaluated against the first in order for the computer to make appropriate fuel corrections. Tampering with the sensors might cause any number of issues; generally all bad.
However, the other day, I was speaking to a tuner from a local shop who assured me that the car only requires the reading from the first O2 sensor to make it’s fueling decisions. The second sensor is not really involved. He further stated that the only reason the second sensor is there is to verify that the cat is doing its job. So if the computer gets a reading from a chip that everything is good…no harm, no foul.
So the question I have again is: ‘What is the computer doing with the second O2 sensor readings?’
Thanks in advance.
Jason