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Question

if i was to elliminate the catilatic convertor on my car and leave the down stream o2 sensor would my car function properly?

Submitted: 163 days and 19 hours ago.

Category: Pontiac

Value: $9

Status: CLOSED

Year : 1997
Make : Pontiac
Model : Grand am gt
Engine : 3.1l v6

Already Tried:
i have cut all of the exhaust off of my car and am about to put new tubing back on

Posted by Lee 163 days and 19 hours ago.

Answer

Hi! There This is what everyone would like to do. But if you live in a emmision state it will fail the test and the check. The car should run fine, there is a possiblity of the exhaust going pass the O2 sensor to fast depending on the muffler you are going to use. This my cause some drivablity problems. It will set a check engine light. Lee

163 days and 19 hours ago.

Reply

what if i was to elliminate the o2 sensor aswell?

Posted by Lee 163 days and 18 hours ago.

Answer

NO! the car will loadup. You need a o2 sensor to regulate the fuel ratio.

163 days and 18 hours ago.

Reply

OH! better not do that then....another question....if i put just the sensor back on, will the car loose mpgs or power? or will the computer just recalibrate n work itself out?

Posted by Lee 163 days and 18 hours ago.

Answer

The Better the system breaths the more power as long as you can keep the fuel right. But the exhaust can not travel past the o2 to fast to work properly. If the o2 does not read correctly the ECM can not control the fuel ratio correctly. causing poor fuel milage and power. by doing this you will need a muffler that will slow the flow enough for correct o2 reading. The older cars was better suited to do what you want. The newer ones are not the best for doing this. You would be better off with a preformace program in the ECM. Lee

163 days and 18 hours ago.

Reply

would two super 44 flowmaster mufflers slow the flow enough?

Accepted Answer

It is poss. I do not know how they are made inside. But I think two mufflers should do it. One muffler with the right design will do it. About 1/2 lb. back pressure at 3000 rpm's should be about right. As o2 get old they respond slower. I would start with a new o2 for best results. Lee

Expert:	Lee
Pos. Feedback:	100.0 %
Accepts:	25
Answered:	10/5/2009

ASE Certified Technician

29 years experience ASE Master Technician

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Question

if i was to elliminate the catilatic convertor on my car and leave the down stream o2 sensor would my car function properly?

Optional Information

Year : 1997
Make : Pontiac
Model : Grand am gt
Engine : 3.1l v6

Already Tried:
i have cut all of the exhaust off of my car and am about to put new tubing back on

Answer

Reply

what if i was to elliminate the o2 sensor aswell?

Answer

NO! the car will loadup. You need a o2 sensor to regulate the fuel ratio.

Reply

OH! better not do that then....another question....if i put just the sensor back on, will the car loose mpgs or power? or will the computer just recalibrate n work itself out?

Answer

Reply

would two super 44 flowmaster mufflers slow the flow enough?

Accepted Answer

It is poss. I do not know how they are made inside. But I think two mufflers should do it. One muffler with the right design will do it. About 1/2 lb. back pressure at 3000 rpm's should be about right. As o2 get old they respond slower. I would start with a new o2 for best results. Lee

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Question

if i was to elliminate the catilatic convertor on my car and leave the down stream o2 sensor would my car function properly?

Optional Information

Year : 1997Make : PontiacModel : Grand am gtEngine : 3.1l v6 Already Tried: i have cut all of the exhaust off of my car and am about to put new tubing back on

Answer

Reply

what if i was to elliminate the o2 sensor aswell?

Answer

NO! the car will loadup. You need a o2 sensor to regulate the fuel ratio.

Reply

OH! better not do that then....another question....if i put just the sensor back on, will the car loose mpgs or power? or will the computer just recalibrate n work itself out?

Answer

Reply

would two super 44 flowmaster mufflers slow the flow enough?

Accepted Answer

It is poss. I do not know how they are made inside. But I think two mufflers should do it. One muffler with the right design will do it. About 1/2 lb. back pressure at 3000 rpm's should be about right. As o2 get old they respond slower. I would start with a new o2 for best results. Lee

Related Pontiac Questions

Year : 1997
Make : Pontiac
Model : Grand am gt
Engine : 3.1l v6

Already Tried:
i have cut all of the exhaust off of my car and am about to put new tubing back on