Kooks Long Tube Headers

[Junkyard Dog]

Didn't they used to sell dummy o2 sensors that would always report good on the computer even if the cats were removed?

That’s what I’m running.

The O2 sensor sends a signal to the computer that it uses to determine how much fuel to put into the cylinders . . .
or do I seriously misunderstand how the engine works?

How does running this part affect the air fuel ratio determination?

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[Junkyard Dog]

https://www.americanmuscle.com/mustang-faq-oxygen-sensors.html

 

[Junkyard Dog]

Don't know how reliable this is, but I thought I would put it here for consideration

 

[Kevi]

The O2 sensor sends a signal to the computer that it uses to determine how much fuel to put into the cylinders . . .
or do I seriously misunderstand how the engine works?

How does running this part affect the air fuel ratio determination?

I believe the upstream o2 sensor above the cat is used for computer calculations and adjustment. The downstream sensor just detects a failed catalyst so it's easy to spoof.

 

[Danee]

You're right.

 

[Gsi30]

Didn't they used to sell dummy o2 sensors that would always report good on the computer even if the cats were removed?

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

 

[Kevi]

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

They are just called o2 simulators or dummy o2 sensors. I haven't really looked for them since the early 2000s. Not sure if they are still a thing with all the new federal emissions laws.

 

[Junkyard Dog]

I believe the upstream o2 sensor above the cat is used for computer calculations and adjustment. The downstream sensor just detects a failed catalyst so it's easy to spoof.

You're right.

I have read differently online from others talking to competent tuners and posting what they were told. I have no firsthand knowledge myself.

But from post #47's link:

The PCM also uses the downstream O2 sensors to check and recalibrate the upstream O2 sensor, combatting sensor drift.

I will keep looking into this.

 

[Junkyard Dog]

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

Thank you. This is very useful information.

 

[Q6543]

Just go to autozone and buy the long defoulers… people making this way too hard on themselves… it’s at the store.

 

[Danee]

I have read differently online from others talking to competent tuners and posting what they were told. I have no firsthand knowledge myself.

But from post #47's link:

[qiote]The PCM also uses the downstream O2 sensors to check and recalibrate the upstream O2 sensor, combatting sensor drift.

I will keep looking into this.
[/QUOTE]
This is very useful information. Thank you.

 

[hattedchimp]

Has anyone installed the headers onto to the non-active stock exhaust? I was thinking of not swapping the catback but just adding catted headers for sound/airflow, but I'm not sure if the fitment is good. or if a different catback is needed.

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