I cut off catalytic converter on my gxp now car won't start

Asked by Jun 12, 2016 at 02:58 AM about the 2005 Pontiac Grand Prix GXP

Question type: Maintenance & Repair

3 Answers

105

Its because u need the back pressure they give off

1 of 1 people found this helpful.
21,995

So, see what happens? Who did the cuttin'? I don't think it is pressure, but there is an oxygen sensor on the CC- maybe disconnecting that has something to do with it? idk, sounds weird to me- doesn't make sense, really-

3,875

I agree. I don't think back pressure has anything to do with it. If they eliminated a sensor that could certainly do it. Look underneath. Maybe the sensor is still there but got disconnected during the catalytic converter removal.

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