# I will still answer this even though I am at your house using your computer ...

Posted by Aaron (92 SE Auto) on September 16, 2004 at 12:50:53: In Reply to: Where's the A/F probe, before or after the cat. conv. posted by MIKE on September 14, 2004 at 16:28:34: My probe is before the cat about 6 inches away from the stock sensor. I probably do have carbon build up, but going from 11.5:1 to 10.3:1 in a matter of seconds is wierd. Then, about 20 minutes later, the problem goes away. Then, it comes back. I noticed this after SEVERAL hours of straight highway driving from FL to NC. I haven't noticed it driving around the city. Lastly, I have a seperate probe. One is the stock narrowband o2 sensor that I decided to keep b/c of simplicity reasons. And the other is the wideband sensor that can also function as a narrowband. But, I chose to keep the two seperate to keep things simple. : If the probe is after the cat and your MPG hasn't changed I wouldn't be too worried about the A/F readings. : If the probe is before the cat maybe you're starting to show signs of carbon build-up in the combustion chamber : Do you have a seperate probe for the A/F readings are did you tap into the OEM o2 sensor? : MIKE Replys:

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: My probe is before the cat about 6 inches away from the stock sensor. : I probably do have carbon build up, but going from 11.5:1 to 10.3:1 in a matter of seconds is wierd. Then, about 20 minutes later, the problem goes away. Then, it comes back. I noticed this after SEVERAL hours of straight highway driving from FL to NC. I haven't noticed it driving around the city. : Lastly, I have a seperate probe. One is the stock narrowband o2 sensor that I decided to keep b/c of simplicity reasons. And the other is the wideband sensor that can also function as a narrowband. But, I chose to keep the two seperate to keep things simple. : : : If the probe is after the cat and your MPG hasn't changed I wouldn't be too worried about the A/F readings. : : If the probe is before the cat maybe you're starting to show signs of carbon build-up in the combustion chamber : : Do you have a seperate probe for the A/F readings are did you tap into the OEM o2 sensor? : : MIKE