Gutting your cat
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Joined: Dec 2025
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^ it is the job of the O2 sensor to monitor the chemistry of the exhaust stream and report that back to the PCM. after adequate warm up, the pcm constantly adjusts the fuel mix to both: run correctly and produce minimum emissions (unburned gas, unburned oxygen).
so - the front/precat O2 (the only O2 in 94-95) is critical to the engine running right. don't remove it.
O2 sensors are only monitored after warm up. so if your rich condition is when engine is cold, it might be some other problem. on the other hand, if it happens when warm, you might need to replace your O2 sensor. they should be replaced about every 60-100K miles.
edit- your muffler guy gave you a line of bull. you don't have to have the cat for the engine to run correctly. you DO have to have the front/precat O2 sensor for the engine to run correctly. you only need the CAT to comply with emissions control.
so - the front/precat O2 (the only O2 in 94-95) is critical to the engine running right. don't remove it.
O2 sensors are only monitored after warm up. so if your rich condition is when engine is cold, it might be some other problem. on the other hand, if it happens when warm, you might need to replace your O2 sensor. they should be replaced about every 60-100K miles.
edit- your muffler guy gave you a line of bull. you don't have to have the cat for the engine to run correctly. you DO have to have the front/precat O2 sensor for the engine to run correctly. you only need the CAT to comply with emissions control.
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Joined: Apr 2010
Posts: 87,404
Likes: 4,214
From: Clayton MI
13 year old thread..... You would be better off starting your own... Tell us what you drive, and what the problem is, and we can go from there.
