sl99ls1

i installed my long tubes and off road y pipe like 2 weeks ago and i didnt put my rear o2 sensors in what can happen???? and what should i do????

Fast Toys Performance Parts

iTrader: (3)

It should eventually throw a check engine light. You either need to get the rear codes tuned out or purchase some O2 sims to prevent the check engine light.

WhosNXT

FT is right. You will throw a code. Until you can afford either a tune or sims you can unplug them and secure them. The rear o2s just tell computer if the cats are working properly.

sl99ls1

there unpluged but my car is runnin f****d up and its backfireing hella bad and theres smoke coming out my cat back and i guy told mr its because my rear o2s are not in and its missin wit the a/f ratio and when we scanned it it throw 2 code for my 02 sensors

Fast Toys Performance Parts

iTrader: (3)

When the PCM detects an emissions failure it can influence the A/F mixture to help try and protect the motor. That might be causing the mixture to go really rich. Do you still have the front O2 sensors installed in the headers?

sl99ls1

yea there in but the rears are unpluged

Tainted

iTrader: (9)

throw a code and thats it. it aint gonna hurt anything

sl99ls1

its back fireing and smoking out the cat back and is running real shitty

Tainted

iTrader: (9)

maybe you have a cracked plug from installing the headers or a plug isnt all the way on or burnt. I had my rears out and untunned for almsot a month and never had any ill effects.

sl99ls1

when i installed my long tubes i changed my plugs and i replaced them again friday and its still doing this

Tainted

iTrader: (9)

and no check engine light or anything? have you checked the wires themselves?

sl99ls1

yea check engine light is on and starts flashin when it starts backfiring it was runnin hella good and then it just started fu****g up

Tainted

iTrader: (9)

auto zone does free code scanning. take it to be scanned, and report back with the code

sl99ls1

my friend works at a shop and he scanned it and it throw 2 code for my o2 sensor

Tainted

iTrader: (9)

mmk left and right bank. so thats expected, and no other helpful codes.

ok, does it running badly happen when only cold? warm? does it have a certain rpm range it does this at?

Black99CamaroSS

iTrader: (3)

Did you plug the fronts into the rear?

Tainted

iTrader: (9)

ehh I doubt he'd do that (or at least lets hope) I think he may have a different issue.

Tell me something, are the headers ceramic coated and how many miles are on your car?

Tainted

iTrader: (9)

nvm, just saw. Im gonna have to say my next guess is if you have a few miles on your 02's, then the ceramic coating is known to mess with the 02's. You could try cleaning off the 02's with a wire brush some.

sl99ls1

they are not coated nd it happen when its cold and warm and it smokes all the time

Tainted

iTrader: (9)

well that throws out the ceramic idea. ermmm ok im out of ideas for the moment.

actually no im not. if you still have your rear 02's, replace your fronts with the rea. they are the same, so if by chance the front are just shot, the rears should rule out that probability.