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Smog Woes for 95 Nissan Maxima - Detailed

Old 06-11-2011, 12:10 PM
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Smog Woes for 95 Nissan Maxima - Detailed

Hello

I hope someone has ideas on what the problem can be. My mods are MEVI,Ypipe, intake, and Greddy SP1 catback. I have a JWT ecu but removed it before the first smog test.

I have failed smog 4 times now and each time it is due to high nox. I have no clue on what it can be right now.

Before the second smog check, I changed the PCV and used Guarantee to Pass. I failed the 15mph test. I had the smog operator conduct a diagnosis and he stated that the EGR is working properly but is not opening all the way due to low backpressure from the catback. He stated that the catalytic converter was bad.

Before the third smog check, I had a new catalytic converter installed and it failed even worse on NOX. The new cat was universal and there does not seem to be any leaks.

Before the fourth smog check, I had the EGR tube and EGR valve cleaned, they were pretty dirty but it failed smog on the 25mph test and barely pass on the 15mph test.

There is a check engine code on now which just came on recently but the code is for the KS and the rear O2 sensor behind the cat. My obd2 reader shows the car going into close loop when I am driving and back into open loop when I am idling. I am assuming the top two o2 sensors are functioning properly.

Can the greddy catback cause a low back pressure environment where the EGR valve won't open all the way or is it a lazy valve? I have check all vacuum and there appears to be no leaks. So right now, I am at out of ideas. Any help will be appreciated.

Thanks.
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Old 06-11-2011, 12:45 PM
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Put your stock ypipe back on, change the cats o2 sensor and you should be golden.
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Old 06-11-2011, 12:54 PM
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Nox is the result of high compression chamber temps. How hot are you running? Lo backpressure could cause low EGR flow. Get a cheap exhaust tip and crimp it flat.
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Old 06-11-2011, 01:00 PM
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Car operating temperature appears to be fine. What are the normal ranges for chamber temps and how would i go about measuring it?
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Old 06-11-2011, 01:21 PM
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Originally Posted by Iilac View Post
Car operating temperature appears to be fine. What are the normal ranges for chamber temps and how would i go about measuring it?
Don't know x2. Make sure your not too lean. Restrict your exhaust a little. And make sure your cooling system is right.
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Old 06-11-2011, 01:22 PM
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Originally Posted by asand1 View Post
Nox is the result of high compression chamber temps. How hot are you running? Lo backpressure could cause low EGR flow. Get a cheap exhaust tip and crimp it flat.
Not comletey closed off, just restricted.
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Old 06-12-2011, 04:36 AM
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Yeppers, high NOx is a result of high temps.

Maybe a good EGR cleaning would help clear out the lines. Or maybe running a little rich would cool things down. But then your hydrocarbons might go up.

I can't believe I'm already forgetting the exhaust basics I learned a few months ago. I think I'm getting old.
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Old 06-25-2011, 06:24 PM
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any updates?
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Old 06-28-2011, 03:47 PM
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Damn it in the same ucked up state for smog.....but isn't that bad where I go I pass NP bit now got a problem for the smog coming up...though...
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Old 07-11-2011, 05:47 PM
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I wanted to give a update. Car finally passed smog. I pour in Chevron synthetic techron in the fuel tank and seafoam the intake maniford and it passed!!! +1 for seafoam.
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Old 07-12-2011, 11:08 AM
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Originally Posted by Iilac View Post
I wanted to give a update. Car finally passed smog. I pour in Chevron synthetic techron in the fuel tank and seafoam the intake maniford and it passed!!! +1 for seafoam.
Did the KS ever code go away or is that still around?

Reason I ask is that I recall when I failed smog for high NOX and HCs the KS was bad so I replaced it and it passed. Even with an aftermarket Y pipe and a OEM type cat, I let the car idle for 15 mins before going into the smog check and it made it through.
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Old 07-12-2011, 10:31 PM
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Originally Posted by 98SEBlackMax View Post
Did the KS ever code go away or is that still around?

Reason I ask is that I recall when I failed smog for high NOX and HCs the KS was bad so I replaced it and it passed. Even with an aftermarket Y pipe and a OEM type cat, I let the car idle for 15 mins before going into the smog check and it made it through.
No, the KS code and O2 sensor code is still around. I think the KS code is triggered by the O2 code and the O2 code came on right after my cat. converter was replaced.
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Old 11-19-2011, 03:55 PM
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did you ever pass?
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Old 11-19-2011, 04:07 PM
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Read post 10 members only jacket wearing manhandler!!!
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Old 06-08-2015, 05:50 PM
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Passed another smog test but after passing the test in 2011, I had it registered in a county which only requires sniffer and not the dyno which is way easier. I still barely pass this year. My HC was at 99 at idle and maximum allowed is 100. I been reading up on the TC-W3 additive and gonna try it on my ole Max.
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Old 09-02-2017, 07:00 PM
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Ole Maxima failed again due to high HC on the 2500 rpm test. It failed by 1 point. Fml.
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Old 09-23-2017, 11:46 PM
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Update, I was able to pass by using Seafoam in the brake booster and 2 cans in the gas. I need to remember to do that before each smog.
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Old 01-02-2018, 12:18 AM
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did it pass?
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Old 01-02-2018, 10:02 PM
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Originally Posted by Nismo View Post
did it pass?
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Old 10-12-2018, 09:36 PM
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Did it pass?
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Old 10-16-2018, 05:04 PM
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Originally Posted by Nismo View Post
Did it pass?

U gonna jinx yourself and your max won't pass smog.
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