cat issues

[oh-hell]

Toyota says the computer is to sensitive for the cat and even a new cat throws a coad after 2k of use, does our car (gt) have a problem with gutting out the cat..? i know it has 2 o2 sensors and im pritty sure it wont hurt anything but i thought id just see if anyone knew...?

[toyomoho]

What year is the car, is it still covered under the extended emissions warranty for the CAT? Gutting the CAT will cause a trouble code as the 02 sensor after the CAT will give an indication of CAT failure. It is possible to replace this 02 sensor with a simulator.

[oh-hell]

Originally Posted by toyomoho

What year is the car, is it still covered under the extended emissions warranty for the CAT? Gutting the CAT will cause a trouble code as the 02 sensor after the CAT will give an indication of CAT failure. It is possible to replace this 02 sensor with a simulator.

its a 2000 gt no warrentee , no emissions law,

[toyomoho]

The CAT and ECU are warranted for 8 year/80K miles.

http://www.epa.gov/obd/warranties.htm

ECU too sensitive? Never heard of this one. Do a Google search for 02 simulators. You can then replace both sensors with simulators; this will allow a stable input to the ECU and hopefully no trouble lights.

[oh-hell]

Originally Posted by toyomoho

The CAT and ECU are warranted for 8 year/80K miles.

http://www.epa.gov/obd/warranties.htm

ECU too sensitive? Never heard of this one. Do a Google search for 02 simulators. You can then replace both sensors with simulators; this will allow a stable input to the ECU and hopefully no trouble lights.

thanks for the link but dont have emission laws in my state and im over 80k

[runabout93]

If you dont have emission laws... then dont gut the cat. Having that gaping bulb screws with the your exhaust flow and will decease power, not help. Just straight pipe it out and sell the cat on ebay or something.

[runabout93]

Okay... I figured that my last post wouldn't be enough... and I would get into an argument. So, I found a resource in 2 seconds. "flow stagnation" was a term I was trying to remember when I posted.

http://www.sportcompactcarweb.com/te...ems/index.html
"Whatever you do, do not remove or gut out the catalytic converter on your street car. The monolithic, straight through design of modern 3-way catalytic converters is usually quite free flowing on most modern sport compact cars, producing at the most, only a pound or two of extra backpressure. A gutted cat can actually hurt power as the empty box can cause flow stagnation, which effectively shortens the length of the moving gas column in the exhaust pipe. The empty box can also reduce important flow velocity. This can be felt as a loss in bottom end power."

[frankie g.]

try to get a new resenator that should help out alot

[SnowManGT]

I agree with runabout93 that you should ditch the cat for a straight pipe if you don't have emission laws.

[poorboy08]

Originally Posted by toyomoho

The CAT and ECU are warranted for 8 year/80K miles.

http://www.epa.gov/obd/warranties.htm

ECU too sensitive? Never heard of this one. Do a Google search for 02 simulators. You can then replace both sensors with simulators; this will allow a stable input to the ECU and hopefully no trouble lights.

Would doing this cause a change in gas mileage? I would imagine that the info they are sending to the ECU is not true as to what is really flowing through the exhaust therefore causeing the ECU to not provide optimal timing and fuel for the amount of oxygen?

[oh-hell]

good question