Question about eliminating cat... O2 sensor?

[cvpsk8er630]

Truck is a 98 305 vortec. The cat is clogged up and needs to be replaced. On my previous truck the old owner hollowed out the cat. If i do this to the 08 truck with the o2 sensor after will this set off the engine light? and is there a way to fix this so it wouldnt set off a code?

[BigAC]

I suggest a thunderbolt cat off ebay. A lot of people run them and they are pretty inexpensive and good quality. But you shouldn’t get any codes the other way. Stick with a cat though. They don’t hurt performance like old cats.

[cvpsk8er630]

also another question if anyone is running no cat with an o2 sensor simulator... where did you order one from?

[hokeplaya05]

i was thinking about pulling the cats out of my 96 too. i just googled o2 sensor simulator and came up with a ton of options. cheap too

[BigAC]

You don't need sims. That's even cheaper. Throw away money if you want though.

[hokeplaya05]

if you dont want a check engine light you do need them

[BigAC]

No you don't. Its a 96 so it has heated sensors. The older 1 wire sensors would cause a ses light because they wouldn't get hot and read if the flow was to great. Not because of no cat.

[BigAC]

But I said he should get a new cat and those are cheaper then o2 sims he doesn't need.

[Quyonmob]

No you don't. Its a 96 so it has heated sensors. The older 1 wire sensors would cause a ses light because they wouldn't get hot and read if the flow was to great. Not because of no cat.

In a 2 O2 OBD2 truck, the rear O2 monitors catalyst efficiency, so a CEL will be triggered if the cat is gutted or removed.

The fact the sensor is heated to improve initial lit-off time has no bearing on the issue at hand.

[97vortec383]

In a 2 O2 OBD2 truck, the rear O2 monitors catalyst efficiency, so a CEL will be triggered if the cat is gutted or removed.

The fact the sensor is heated to improve initial lit-off time has no bearing on the issue at hand.

This. Unless you get a custom tune to address the fact of there not being a cat the light will stay on.

[Quyonmob]

This. Unless you get a custom tune to address the fact of there not being a cat the light will stay on.

Or run an O2 simulator to lie to the ECM that the cat is doing it's job just fine.

[BigAC]

The guy I do side work for had the cats stolen off two of his work trucks and he just put pipes in them. Never had a SES light. They were OBD2. Maybe he got lucky.

[Quyonmob]

The guy I do side work for had the cats stolen off two of his work trucks and he just put pipes in them. Never had a SES light. They were OBD2. Maybe he got lucky.



Csb.

[Chevyrider1904]

I've been wanting to gut my cat's but they said that my truck can go on limp mode specially this being a truck with emissions vaccum etc.. This true???

[dtmmil]

My suburban is a 97, after searching and asking here and getting the answer that the light will come on but run fine, I removed my cats, runs good, a little louder, and the light is always on for the cats, I know why its on, and when I get a tune, it won't be anymore, so when they say that the light will come on, trust them, the light will come on.

[Quyonmob]

I've been wanting to gut my cat's but they said that my truck can go on limp mode specially this being a truck with emissions vaccum etc.. This true???

May want to share make/model/year... :banghead:

[cvpsk8er630]

right I just cant have the light on to pass inspection, but wiht an o2 sim for around 50 bucks Ill get that and pass no problem.

[kemble]

Or instead of spending $50 for no real reason, you could buy another cat or even better for a small amount more get a custom tune.