Question about 2004 Chevrolet TrailBlazer

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If I cut the Cat converter off my 2004 trail blazer well it still run

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Likely it will run but poorly. Removing the cat will throw off the O2 sensor readings, changing the fuel curve..

Posted on May 17, 2011

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That model car will have an O2 sensor in front of and behind the catalytic converter, looking for oxygen levels in both places. Removing the cat will cause the sensor behind to have unexpected readings and will probably make the ECU go into "limp-home" mode. Although you can drive the car this way, it is not efficient, you gas mileage will suffer, as well as acceleration. So, no I wouldn't recommend removing the cat.

Posted on May 17, 2011

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Yes it will still run. But running w/o a cat is illegal. And you will fail any emissions test. Also you will lose gas mileage. Hope this helps, James Booth

Posted on May 17, 2011

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Wrong.... Some of you guys just don't know... My cat was cut 07 TB 4.2...increased gas mileage and power!! 388 on first tank 19.6 ..second tank steady at 20.6 . stinks/ exhaust... Gonna double check welds at straight pipe. Got engine code...but I don't care.. Extremely happy with new performance!! Well take time on cat purchase if I get one


Posted on Jul 15, 2015

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Posted on Jan 02, 2017

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