O2 Sensor Trivia

Sendero · 04-25-2005, 01:12 PM

Why does the car trip a Check Engine Light with the rear O2's disconnected even though they are turned OFF in the programming?

-and-

Why do the Wideband installation instructions tell you to put the O2 sensor in upstream of the cats because it will give inaccurate readings if the sensor is placed downstream of the cats when all major dyno's use a Wideband sensor that sticks into the tailpipe?

(I really don't know these answers, I am just asking)

Italian LX · 04-25-2005, 01:20 PM

Quote:

Originally Posted by Sendero

Why does the car trip a Check Engine Light with the rear O2's disconnected even though they are turned OFF in the programming?

What rear O2 sensors?

Quote:

Originally Posted by Sendero

Why do the Wideband installation instructions tell you to put the O2 sensor in upstream of the cats because it will give inaccurate readings if the sensor is placed downstream of the cats when all major dyno's use a Wideband sensor that sticks into the tailpipe?

What's a cat?

QWKSNKE · 04-25-2005, 02:07 PM

Quote:

Originally Posted by Sendero

Why do the Wideband installation instructions tell you to put the O2 sensor in upstream of the cats because it will give inaccurate readings if the sensor is placed downstream of the cats when all major dyno's use a Wideband sensor that sticks into the tailpipe?

Because the cats do remove part of the fuel that is coming out (which is part of their job)of the exhaust.

I believe we have already discussed issue between 'tailpipe' widebands and real widebands. The tail pipe ones are not as accurate but at the same time I do believe they sample a little different.

93Cobra#2771 · 04-25-2005, 02:21 PM

Yes, cat's burn even more of the unburnt fuel left over from the combustion process. And in the case of 93 and older fox bodies, the air tubes actually pump oxygen into the cats to keep them nice and hot.

However, at WOT, the cats don't work nearly as well. Don't know how, if any, differnent tailpipe o2's sample the air behind the cats.

Sendero · 04-25-2005, 03:05 PM

I can live with that.

How bout an answer for #1?

Ponygirl · 04-25-2005, 03:16 PM

Quote:

Originally Posted by Italian LX

What's a cat?

You know furry, purring awesome creatures! Like this:

QWKSNKE · 04-25-2005, 03:22 PM

Quote:

Originally Posted by Ponygirl

You know furry, purring awesome creatures! Like this:

Italian LX · 04-25-2005, 03:29 PM

Quote:

Originally Posted by Ponygirl

You know furry, purring awesome creatures! Like this:

Wow, I can't belive it took 2 hours before someone finally came back with that. . . however, I knew Shelly wouldn't pass it up.

Italian LX · 04-25-2005, 03:30 PM

Quote:

Originally Posted by QWKSNKE

What are you laughing at. . . don't you have some Chevy 350 you need to be working on somewhere. :P

QWKSNKE · 04-25-2005, 03:30 PM

about to head over there now

04-25-2005, 02:21 PM	#4
93Cobra#2771 The Kocky One Join Date: Dec 2004 Location: Yeah, but those cutters won't bust any walnuts.â„¢ Posts: 1,948	Re: O2 Sensor Trivia Yes, cat's burn even more of the unburnt fuel left over from the combustion process. And in the case of 93 and older fox bodies, the air tubes actually pump oxygen into the cats to keep them nice and hot. However, at WOT, the cats don't work nearly as well. Don't know how, if any, differnent tailpipe o2's sample the air behind the cats. __________________ *For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150!* Richard White 93 Cobra Kocky will be back!

04-25-2005, 03:05 PM	#5
Sendero Im gonna show her my... Join Date: Dec 2004 Location: Somewhere providing FREE tech support. Posts: 4,269	Re: O2 Sensor Trivia I can live with that. How bout an answer for #1? __________________ I heard it on the internet, so it must be true. "I believe that a person's moral compass can be determined by how he references free men the right to defend themselves." T. Nugent "An armed society is a polite society. Manners are good when one may have to back up his acts with his life." R. Heinlein "Never argue with an idiot. They drag you down to their level, then beat you with experience." -Unknown

04-25-2005, 03:30 PM	#10
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: O2 Sensor Trivia about to head over there now __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

04-25-2005, 01:12 PM	#1
Sendero Im gonna show her my... Join Date: Dec 2004 Location: Somewhere providing FREE tech support. Posts: 4,269	O2 Sensor Trivia Why does the car trip a Check Engine Light with the rear O2's disconnected even though they are turned OFF in the programming? -and- Why do the Wideband installation instructions tell you to put the O2 sensor in upstream of the cats because it will give inaccurate readings if the sensor is placed downstream of the cats when all major dyno's use a Wideband sensor that sticks into the tailpipe? (I really don't know these answers, I am just asking) __________________ I heard it on the internet, so it must be true. "I believe that a person's moral compass can be determined by how he references free men the right to defend themselves." T. Nugent "An armed society is a polite society. Manners are good when one may have to back up his acts with his life." R. Heinlein "Never argue with an idiot. They drag you down to their level, then beat you with experience." -Unknown