O2 Sensor talk

[xLeGeNDx]

I think I got everything narrowed in, but the car smells to be running pig rich, I'm thinking the O2 sensor might be the cause, I have ran the car from dead cold to hot with the O2 plugged in and it smells pig rich with no code, I have also ran the vehicle with the O2 unplugged, no code is present, and its just as rich smelling. Whats your take on the O2 sensor, think its good or bad?

Whats a simple test i can do to test it? I really dont feel like removing it from the car do to it being a pain in the ass to get to unless theres an easier way to get to it w/o having to take the upper intake off to get clearance to get to the back of the engine. The car is a 92 GP thats been swapped with a 94 DOHC.

[robertisaar]

watch datastream values to see if it's switching like it should?

[xLeGeNDx]

I dont have any scan tools for it.

[Schurkey]

I dont have any scan tools for it.

Without a scan tool, the best you can do is replace it. Under twenty bucks at Amazon or from other discount parts suppliers.

A scan tool can tell you that the sensor is defective. It can't tell you that the sensor is good.

Had a pickup truck that the O2 sensor tested very good...until I got to highway speed. Then the sensor read lean, and caused the computer to command full-rich. NOTHING fixed that problem until I switched sensors.



The first time I put an O2 sensor on my '93 Euro 3.4, I just cut the exhaust pipe after the bend (in the straight section) with a sawsall, unbolted it from the exhaust manifold, and removed that section of pipe. The sensor can then be removed and installed from below, although it isn't a lot of fun. Re-sealed the exhaust with a band-clamp; under ten dollars but probably a special-order; and you have to assure that you're buying the correct size to fit the exhaust pipe.

A person is almost better off removing the upper intake; that way you can check on the hard 'n' brittle plastic vacuum hoses, the large and commonly-degraded rubber hose from upper intake to brake booster, and also clean out the EGR passage. More work, might be worth it.

[xLeGeNDx]

I should of probably checked it when I had the intake off, doing the valley, upper and lower intake gaskets the last time around. I been wanting a scan tool. But haven't found anything to inexpensive.