Brickmaster

I have long tube headers and am having issues with ecm reading the sensors. Where can I purchase the right o2 spacers for my cats ? Straight or angled? Thanks

PMPerformance

What do mean problems reading them?
Spacers won’t fix them not reading, they will “hack” them to not trigger a cel for lack of catalyst.

There are other cels that can happen from the rears though like heater circuit codes, which spacers will not fix

Brickmaster

the car will not pass inspection , motor runs perfect, nothing on the DIC, but when they hook up to the NYS inspection machine it flunks . Will spacers help?

PMPerformance

if you don’t know what it’s failing, we can’t tell you if these will work.

Brickmaster

three readiness codes coming up one is 02 sensor. Only mod is the headers motoris new crate engine As are all sensors. Which adapters are needed, stright or angled?

Brickmaster

The down stream o2 sensors are indicating a faulty cat according to the inspection station. Will the spacer help? Straight or angle? Will adding these gave an adverse effect on air/fuel mixture without a re-tune???

PMPerformance

If it is a catalyst code, then yes, spacers have a high likelihood of helping.
If the code is anything else other than no catylst, then spacers will not help.

As mentioned on your other post, rear o2’s have ZERO involvement in the tune or fueling. They do not compensate fuel maps, their only job is to sense monitor performance.

If you are getting low catalyst, your cel would be on.
Was the car tuned? Do the sensors show ready?

I think it would benefit you to scan the car yourself and post the code details

Brickmaster

Car was not tuned.

Brickmaster

So do I need straight or angled adapters to try this? 18 mm I believe is the size know where I buy these? Thanks

PMPerformance

If the car was not tuned, and you are not getting a cel for lack of catalyst, but your inspection station is saying you are: you need to provide some more information.

Please Run the codes and confirm what codes show.
Please upload the failure sheet with the list of violations the car has as to why it failed.

If you want to just guess and throw money at it: get angled spacers as there is not enough space to get a straight one in there.

sirdano

and spacers might fail visual if they look

PMPerformance

oh, you have seen that happen before?
I purposely try to keep my car under 5k for the year to be emissions exempt to not have to deal with this.

Brickmaster

In New York does not mater 0 or 100 k car has to pad. My car is not a garage queen , gets driven hard, put away wet, unlike the posers on Long Island lol I went to a car show and show at Atlantic Chevy and saw nothing but assclowns. One was using a paint brush to clean the inside of serpentine belt two other meat ***** bragging up low milage on cars. I got sickened and left. I own this and my c2 big block car.

MARSC6

https://www.walmart.com/ip/O-Sensor-...hoCcP8QAvD_BwE

Hopefully they work better for you than they ever did for me.

Spaceme1117

Right angle sensor spacers should help but no guarantee.

Getting a tune could also help. Many times headers will change the AFR more than the stock ECM calibration can account for.

PMPerformance

You are not painting an accurate picture for OP with this claim.

The fueling tables have absolutely nothing to do with why he is failing. Nor do the headers cause a change in afr that the stock ecm cannot accomodate for.
He could have the car tuned and the issue not go away if the tuner does not shut off the rear o2 feedback or manipulate the response delays

BadAV

So what exactly are the codes? It's just a guess without the codes. No SES light indicates it could possibly be some OBD readiness codes (look up "GM emissions readiness drive cycle" for the comprehensive list of requirements that must be met) are incomplete, like evap, and more drive time is needed to meet all of the conditions for them to complete. Get the codes and do some research before you just start throwing money at it.

Brickmaster

I ran that cycle at least 6x. From cold start to 55 mph coat etc. everything except jump up and down and rub your tummy while driving it would take General Motors to come up with something stupid like that Luckily, I have a long stretch of beach that I was able to do that on! General motors must think everybody has a test track accelerate to 55 miles an hour let it coast, then full three-quarter throttle and all that bullshit I went through it all colts night. I had to drive the car out to where I had to test it let it cool down which took hours hours to cool down below 122° did you to call Stach process never seen so much nonsense to reset an ECM.