exhaust Sensor questions

[white00s10]

i have a question, theres a myriad amount of sensors inthe ehaust of my truck, and i know screwing with any one of them will throw a code. Is there any way, or is there any thing, that i can do/use to disable these sensors. IS there any thing that could "trick" the sensor into thinking eveything is running well,without having the sensor in the exhaust system?

[T Man]

Unless you are plannin on modifying your exhaust system at all (cutting the cat, which is unnecessary on your truck) I wouldnt recommmend it. They build o2 simulators, but you will loose mileage by doing this. Unless you want to remove your cat though, there isnt any reason to, and you wont be getting any gains.

[OBI WAN]

i have a question, theres a myriad amount of sensors inthe ehaust of my truck, and i know screwing with any one of them will throw a code. Is there any way, or is there any thing, that i can do/use to disable these sensors. IS there any thing that could "trick" the sensor into thinking eveything is running well,without having the sensor in the exhaust system?

The ones in the exhaust are the most important ones since they know when it is running well and when it isnt and have the final say to everything within the tune!

[DROPPEDGMC]

i agree with both:D

[white00s10]

ok, but if i was going to go with a full exhaust from the headers back (bear with me, im still learning) would that throw a code?

[XxInFaxX]

are you planing on removing the cat out of the sequence?

[white00s10]

no, ill probably just put in a high flow cat

[OBI WAN]

You can do the whole exhaust from the manifolds back. Jegs, Summit and other companies sell wled in bungs to hold the 02's. Just need to locate them in the pipes as close to the factory location as you can! Computer will not know what you've done and all aftermarkets are done the same way when available!

[damon96706]

I went the custom route, but the shop welded the bungs in and reinstalled the stock sensors. The pipes are 2.5" sweated into 3' cats, and back to 2.5" through a set of magnaflows. I'm reading a dtc of p0420, which I can clear for a day, and then it returns.

Is this something that's going to cause damage in the future, or is there a remedy out there? Other than a loud rumble exhaust tone, nothing feels wrong operationally. The shop owner did tell me my exhaust would be read as "off" by the obd 2, due to the free flow and volume.

Thanks in advance.

[rat]

P0420- catalyst system efficiency below threshold

It won't hurt any thing, the new cat just doesn't work as good as the stock one. You might be able to get a o2 sensor simulator. This is ONLY for the sensor after the cat. The ones in front of the cat are used to determine the fuel mixture. You can also have the computer tuned so that the error doesn't turn on the ses light.

[damon96706]

Thanks, rat. I'll look into the 02 sim, but am not sure about the obd tuning. What type of program, etc, would be used?

Thanks again,

Damon

[rat]

PCM for less could do it ~$250 http://www.pcmforless.com/

You can do it your self on your 2004(?) with ls1 edit, this is probably the most expensive route. http://www.carputing.com/

SLP can do it too i think. http://www.slponline.com/view_product.asp?P=PCMH

The Simulator is probably going to be the cheepest if it works on the newer trucks.

[damon96706]

Thanks for the speedy reply. Yeah, it's a 2004 model. Chevy kept the s10 4x4 crewcabs last year, and killed the rest of the s10 line in favor of the Colorado, which I tested before buying the zr5. The Colorado crewcab baseline model was 2k more than the zr5 loaded, and I couldn't find the extra 30 hp that the Colorado reportedly has (and I looked hard).

I'll check out your links. Thanks again, bro.