At 04:39 AM 7/15/01 -0400, you wrote:
>I just took the cat off my 97 and while preparing to do this, my buddy
>and I brainstormed and this is what we came up with: the aft sensor
>doesn't actually affect how the engine runs, it's just there to satisfy
>OBD2 laws, to double-check that the cat is working. when properly
>functioning, it passes a voltage of between 100 and 900 millivolts,
>averaging 400. Logically, this is slightly lower than the sensor
>upstream of the cat. Less oxygen, less voltage. So in order to create a
>false reading after the cat is gone, wire in a resistor in the negative
>lead that will drop the voltage just enough, say 250 millivolts, 1/4
>volt. Offhand I don't know how many ohms that is, not much I'd assume.
>You must leave the sensor in the exhaust because it only functions
>properly at its operating temperature of around 600 degrees.
> HOWEVER, after taking the cat off my truck, it runs great, hasn't
>thrown any codes, and the check engine light hasn't come on. *shrug*
>Haven't touched the sensors.
> Oh, and the exhaust is noticeably louder. ;-) William
Thanks William. I'll pass this along. Interesting comment on the
exhaust getting louder.
Bob
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:02:06 EDT