Res. delete
Joined: 02-04-12
Posts: 9,042
Likes: 7
From: Donegal, PA (Pittsburgh Area)
I read through this and you keep mentioning fuel trims. I don't know if you are confused, but having not catalytic converter isn't going to affect your fuel trims whatsoever. The only way it could affect fuel trims is if it was severely clogged. The upstream (pre-cat) 02 sensor is the one responsible for telling the ECU to cut/add fuel. The downstream (post-cat) 02 sensor is there to measure exhaust emissions to make sure the cat is doing it's job.
Joined: 05-18-11
Posts: 39,564
Likes: 87
From: West Chicago, IL
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