Failed smog test. I am a gross polluter. Help??

[Takeoff]

Here are my results.%co214.1 at 15mph14.2 at 25mph

%o20.6 at 15mph0.4 at 25mph

HCmax 88 / meas 138 at 15mphmax 53 / meas 86 at 25mph

COmax 0.52 / meas 0.60 at 15mphmax 0.50 / meas 0.62 at 25mph

NOMax 704 / meas 3720 at 15mphMax 738 / meas 3130 at 25mph

I bought the car as a project and i'm finally trying to get it registered. They said my PCV was missing and same with my Pulse Air Injection. I have read and everyone says that NO is usually a problem w/ the EGR so I will check that out. Any other helpful suggestions are wanted. thanks in advance.

[dkdeleon68]

I would check egr.but also check injectors a loose or cracked injector will make your car run rich and running rich you will fail NOX.

[NISTECH]

.but also check injectors a loose or cracked injector will make your car run rich and running rich you will fail NOX.

WRONG!!!! Bad info

A rich fuel condition will have a completely opposite effect. The excess fuel will cool the cyl and bring NOx down. NOx requires 2 things to happen high cyl temp [2500 degrees] and pressure.

IT looks like you have a couple things going on. I am suspicious of 2 things with the high Hc and Co your car may or may not be running a little rich but I say probably not since your NOx are so high. I suspect your cat is bad, but an O2 check would be a good idea. For your NOx I suspect you also have an EGR issue going on. Check for codes see if you got any stored in the ECM. If so post those back. But also take a look at the little rubber hose under your BPT see if it is extreamly soft almost to a mushy point if so replace it also if it is burned through. If you find that and fix it be aware it wont fix the other 2 gases that failed.

Here is the EGR and BPT the BPT is the higher disc in the picture and has a hose right underneath it. The BPT is the one with 2 bolts in the top of it.

[dkdeleon68]

WRONG!!!! Bad info

A rich fuel condition will have a completely opposite effect. The excess fuel will cool the cyl and bring NOx down. NOx requires 2 things to happen high cyl temp [2500 degrees] and pressure.

IT looks like you have a couple things going on. I am suspicious of 2 things with the high Hc and Co your car may or may not be running a little rich but I say probably not since your NOx are so high. I suspect your cat is bad, but an O2 check would be a good idea. For your NOx I suspect you also have an EGR issue going on. Check for codes see if you got any stored in the ECM. If so post those back. But also take a look at the little rubber hose under your BPT see if it is extreamly soft almost to a mushy point if so replace it also if it is burned through. If you find that and fix it be aware it wont fix the other 2 gases that failed.

Here is the EGR and BPT the BPT is the higher disc in the picture and has a hose right underneath it. The BPT is the one with 2 bolts in the top of it.

sorry for bad info i was just going by what the nissan shop told me.

[NISTECH]

You would be suprised how many techs are misinformed or mistrained on NOx failure.

[Takeoff]

Thanks. I will check those things out.

[hazw8st]

Here are my results.%co214.1 at 15mph14.2 at 25mph

%o20.6 at 15mph0.4 at 25mph

HCmax 88 / meas 138 at 15mphmax 53 / meas 86 at 25mph

COmax 0.52 / meas 0.60 at 15mphmax 0.50 / meas 0.62 at 25mph

NOMax 704 / meas 3720 at 15mphMax 738 / meas 3130 at 25mph

Any other helpful suggestions are wanted.

Gross polluter....passed.