Thanks a lot. Any trick to getting this o2 out or its pretty straight forward? I havent even looked to see where it is yet but i assume its under the manifold cover, Its been in the car 15 years so im gonna assume right now it wont come out without some heat and/or leverage.

 

The hardest part is undoing the electrical connector because it's obscured by the transmission. They're all pull tabs.

When you remove the sensor from the exhaust, don't crank on it, get the longest wrench you can find I think it's a 7/8ths, and just give it a quick whack.

 

Secondary air injection doesn't cause any hesitation as the air-pump does not work while the car is at operating temperature. The air pump only works on cold starts to aid in emissions burn off and to help the catalytic converter come up to temperature.

The cat and O2 sensor won't work until exhaust temperature is roughly 600F at the end of the exhaust manifold, ideally for it to work at it's most efficient exhaust temp should be ~800F.

 

Yes. PB blaster is helpful.

Otherwise, 50/50 mix of Acetone and Automatic Transmission Fluid. Don't ask me why that works, but it works so well that I can remove rusty-ass 18-year-old exhaust bolts with a 1/4 drive ratchet.

Here's a shot from the FSM detailing the location of the parts in question.

...I guess you click to expand...? Tell me if the image isn't working.

 

Whenever I remove o2's I warm the car up well. Get it hot and it should break loose. Piece of cake

 

Thanks a lot guys for all the input. Any suggestions as to where i can find the upstream o2 for the best price? Dealer price is crazy..

 

Rockauto

There are many options from Rockauto. Denso is the OEM supplier, Bosch would be second choice if you're really strapped for cash. Don't bother with any of the other brands.

Denso is $92, Bosch $35.

 

Thanks man the image works, but thats the downstream sensor. Mine is bank 1 circuit 1 so isnt that one in the manifold??

 

Ah, that's a combination picture.

The first picture shows both sensor plugs on the left side, that's what it's meant to illustrate. It's a drawing from behind the transmission mount, so the Downstream sensor is also pictured in the frame, but that's just a conincidence. It's not the focus of that picture.

The second picture shows the upstream sensor (in the manifold) with a wrench on it. That's the sensor you remove. Hence the cartoon wrench.

Those cartoon drawings are not always perfect, or easy to understand.. That is the factory manual though, not some 3rd-party manual.

 

After reading thru this thread am I correct to conclude that without a dyno and a tuner installing an itb system would be a waste of resources? Thanks