No Cats and sensor issues?
Thread Starter
Racer
Joined: Oct 2002
Posts: 494
Likes: 0
From: Victoria BC
No Cats and sensor issues?
So I have a thread running now regarding the issues I am having with my cats being in the way of my EM long tube headers. 
The option I am looking at now is removing the cats. One cat though has a sensor. This car is a 1994. I have had one responce saying it will not throw any codes. I would like more opinions please. There are no emmisions checks here also.
The option I am looking at now is removing the cats. One cat though has a sensor. This car is a 1994. I have had one responce saying it will not throw any codes. I would like more opinions please. There are no emmisions checks here also.
Thread Starter
Racer
Joined: Oct 2002
Posts: 494
Likes: 0
From: Victoria BC
Originally Posted by VictorRussell'92
your 1 responce checking in 
It will not throw a code....many people have done this on a 94.
It will not throw a code....many people have done this on a 94.
Thread Starter
Racer
Joined: Oct 2002
Posts: 494
Likes: 0
From: Victoria BC
Originally Posted by VictorRussell'92
your 1 responce checking in
It will not throw a code....many people have done this on a 94.
It will not throw a code....many people have done this on a 94.
Hey thanks again for writing in. You are the responce. Sometimes though peoples experiences varies. This system was supposed to be a simple bolt in from what other people had said. Thanks again.
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Team Owner
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From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Originally Posted by jodyeastman
So this has me thinking. What is the sensor in the cat there for if it is not required? 
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
I have a '94. My car has three O2 sensors, two in front of the cats and one behind the passenger cat.
Victor is right about the reason for this third sensor. GM wanted to do field testing for the upcoming OBD2 switch and they used that third O2 sensor to take data whenever the car was taken back to the dealership.
It is strictly for test purposes ONLY. The code running in your PCM doesn't care about it one bit. On my car, it wasn't even connected and I had been driving it around like that for 2 years. NO codes.
I removed it when my cats were removed and have not had a single problem.
Victor is right about the reason for this third sensor. GM wanted to do field testing for the upcoming OBD2 switch and they used that third O2 sensor to take data whenever the car was taken back to the dealership.
It is strictly for test purposes ONLY. The code running in your PCM doesn't care about it one bit. On my car, it wasn't even connected and I had been driving it around like that for 2 years. NO codes.
I removed it when my cats were removed and have not had a single problem.
