p2273 p2271 after header install

[Jhncrwfrd]

It's also strange because I don't get it all the time. I reset the code the day I posted here, and it hasn't come back. If I made it read a constant .4v -.5v would that make it not come back?

 

[stevj]

This was more info we could have used earlier in the thread.
What's with the secrecy? If you want intelligent and useful responses, give us all the facts.

Steve

 

[HSKR R/T]

It's also strange because I don't get it all the time. I reset the code the day I posted here, and it hasn't come back. If I made it read a constant .4v -.5v would that make it not come back?

You can't "make it" read a different voltage. And it needs to fluctuate or will also pop a code

 

[Cbty2050]

The PCM does not detect a rich to lean switch within a specific time period, during a decel fuel shutoff event, the monitor will fail.

That is how it is monitored, so it's seeing a rich

 

[Cbty2050]

I have the truck tuned through livernois. They won't turn off rear o2's. The truck also doesn't have any catalytic converters anymore. Local muffler shop made me a catless y pipe. The o2's are installed though.

We all need the name of that muffler shop.

 

[Jhncrwfrd]

You can't "make it" read a different voltage. And it needs to fluctuate or will also pop a code

I can make make it read a certain voltage. Lol. The variance/up and down is what I was really asking I guess. That sucks.

 

[Jhncrwfrd]

We all need the name of that muffler shop.

Ita a guy I've known my whole life. I won't be putting his name out there, but I could talk to him about another one...

 

[Jhncrwfrd]

You can't "make it" read a different voltage. And it needs to fluctuate or will also pop a code

So if I made the max reading the sensor would show .5v and let it work normally below that, would it trigger a code?

 

[BowDown]

Explain why the downstream O2 sensors need to be turned off due to shorty headers.

The downstream is stuck/biased rich, usually an O2 sensor not switching, they do get "lazy" with age. Or a possible exhaust leak could set it, not likely.

Sounds like the cats aren't getting hot enough which is typical with installing headers including shorties and causing the O2 codes.
Seen it many times and it's common issue and resolution on the hellcat forums.

 

[theblet]

Sounds like the cats aren't getting hot enough which is typical with installing headers including shorties and causing the O2 codes.
Seen it many times and it's common issue and resolution on the hellcat forums.

He has no cats. We finally found this out, which is what’s producing the codes. I’ve always used extension tubes or drilled out non foulers for this on chevys. Not sure if it should work here or not

 

[BowDown]

But why 2271 and 2273? Instead of the normal cat efficiency codes?

Well with your added info, I'd have expected P0433/434 but I've seen both and your reported codes are the same as they get on the HC forums after modding the exhaust ahead of the cats or the cats

 

[BowDown]

He has no cats. We finally found this out, which is what’s producing the codes. I’ve always used extension tubes or drilled out non foulers for this on chevys. Not sure if it should work here or not

I see that and it seems to me @stevj is correct

 

[BowDown]

It's also strange because I don't get it all the time. I reset the code the day I posted here, and it hasn't come back. If I made it read a constant .4v -.5v would that make it not come back?

The pcm will retest multiple times before displaying that code again.
I could reset my P0433/4 and get 100-200 miles before it'd display the code again

 

[BowDown]

So if I made the max reading the sensor would show .5v and let it work normally below that, would it trigger a code?

Why go through all that, if you're tuned is your pcm unlocked? Why not get hptuners and a couple credits and turn them off yourself

 

[HSKR R/T]

He has no cats. We finally found this out, which is what’s producing the codes. I’ve always used extension tubes or drilled out non foulers for this on chevys. Not sure if it should work here or not

I've never had non-foulers work on my Mopars.

 

[Jhncrwfrd]

I've never had non-foulers work on my Mopars.

Different styles of non foulers installed and none of them seem to do anything. It's kind of weird though. I got those codes probably 2-3 times right after the header install. It's been 500 +/- miles at this point and it has not come back. Will see how it goes.

 

[HSKR R/T]

Different styles of non foulers installed and none of them seem to do anything. It's kind of weird though. I got those codes probably 2-3 times right after the header install. It's been 500 +/- miles at this point and it has not come back. Will see how it goes.

Yeah, zive tried a couple different versions as well, and never had any luck with them. My last car I deleted the cats on, I just used my scan tool to clear the codes when they popped up. Was usually about once a week