True duals-how to?
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Amateur
Joined: Aug 2011
Posts: 32
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So your 1500 has 2 cats? Mine had the same setup as described for your 2nd gen; one pre cat and one after. But did you have the sensors in a single pipe before they were connected? Would that be fine to do?
Administrator
Joined: Jul 2007
Posts: 24,686
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From: South Georgia/East Florida
Yep, '04s went to 2 cats, one on each side before the factory "Y".
If you are omitting the cat, you can put both sensors in a single pipe, but you are going to have to change the exhaust air between the two to simulate it went through a working cat or it will pop a CEL immediately. I think they still sell "sims" for around $100 or you can do the simple $5 non-fouler trick (search the FAQ section for a DIY on using non-foulers)...
If you are omitting the cat, you can put both sensors in a single pipe, but you are going to have to change the exhaust air between the two to simulate it went through a working cat or it will pop a CEL immediately. I think they still sell "sims" for around $100 or you can do the simple $5 non-fouler trick (search the FAQ section for a DIY on using non-foulers)...
Professional
Joined: Oct 2010
Posts: 147
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From: North Dallas area
From http://en.wikipedia.org/wiki/Oxygen_sensor
The sensor does not actually measure oxygen concentration, but rather the difference between the amount of oxygen in the exhaust gas and the amount of oxygen in air. Rich mixture causes an oxygen demand. This demand causes a voltage to build up, due to transportation of oxygen ions through the sensor layer. Lean mixture causes low voltage, since there is an oxygen excess.
Administrator
Joined: Jul 2007
Posts: 24,686
Likes: 21
From: South Georgia/East Florida
Yep, what's gonna throw a CEL is when there is no change in exhaust gases between the two sensors which is why you use the non-fouler, to get the rear sensor more out of the exhaust flow. The resulting cleaner exhaust appears that a cat is in place and doing it's job...