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Old 07-11-2012, 09:47 PM   #1
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NJ Emissions Fail. Results included. Any help appreciated

So I failed emissions today. Would love some help. Here is the result of the test:

1992 YJ. 2.5L. Brand new (1 wk old) magnaflow exhaust.

Primary Test (IDLE - about 800-900RPM):
___Reading __Standard
HC - 382 - 220 (FAIL)
CO - 5.18 - 1.20 (FAIL)

CO2 - 12.3 (pass) (no standard given)
O2 - 1.2 (pass) (same)

HIGH IDLE (I watched him keep it at only about 1700rpm.. I bet there is some consistency issues at the NJ inspection. I thought they needed it at 2500rpm)
___Reading__ Standard
HC - 140 - 220 (pass)
CO - 3.38 - 1.20 (FAIL)
CO2 - 11.8 (pass)
O2 - 0.9 (pass)

Thanks for any help ahead of time! I'll keep everyone updated on the progress throughout all of this to help future emissions rejects

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Old 07-11-2012, 10:52 PM   #2
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have you ever had it tested before or was this the first time?

when was the last full tune-up?

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Old 07-11-2012, 11:15 PM   #3
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i don't think the muffler would those numbers.
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Old 07-11-2012, 11:30 PM   #4
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Your problem is CO, Partially burnt fuel, your Jeep is running WAY to RICH! A tune up will NOT change your tailpipe numbers, do not listen to anyone suggesting this, a tune up WILL fix HC issues (if there is a faulty ignition part). Your slight HC issue is a result of the excessive CO.

CO can be the result of:
leaking fuel injector(s)
Stuck open Canister purge solenoid
faulty Fuel pressure regulator
Cat Converter not working (I say this because the low CO2, should be 14.7%)
plugged PCV
Low compression

CO like yours can be caused by anything that causes a severe rich mixture, a severe failure to complete the combustion process can cause high CO as there is not enough air to burn all the fuel.

In Cali we have a small window between 2250 and 2750 for the high idle test, if he is able to hold it and be able to test it at 1700, that might be what your state specifies.
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Old Jeep that was totaled (and SOLD!):
http://www.wranglerforum.com/f330/2x...ad-101879.html
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Old 07-11-2012, 11:31 PM   #5
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Quote:
Originally Posted by Timberwolf View Post
have you ever had it tested before or was this the first time?

when was the last full tune-up?
First time I've had it inspected since I have owned it. And I'm not sure when I've done a lot to it since I've had it but never a full tune up.

Quote:
Originally Posted by Nubby55 View Post
i don't think the muffler would those numbers.
I didn't think that it had any effect I was just including that the muffler is new as information being that it's part of the exhaust system.
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Old 07-11-2012, 11:39 PM   #6
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Quote:
Originally Posted by 2xs View Post
Your problem is CO, Partially burnt fuel, your Jeep is running WAY to RICH! A tune up will NOT change your tailpipe numbers, do not listen to anyone suggesting this, a tune up WILL fix HC issues (if there is a faulty ignition part). Your slight HC issue is a result of the excessive CO.

CO can be the result of:
leaking fuel injector(s)
Stuck open Canister purge solenoid
faulty Fuel pressure regulator
Cat Converter not working (I say this because the low CO2, should be 14.7%)
plugged PCV
Low compression

CO like yours can be caused by anything that causes a severe rich mixture, a severe failure to complete the combustion process can cause high CO as there is not enough air to burn all the fuel.

In Cali we have a small window between 2250 and 2750 for the high idle test, if he is able to hold it and be able to test it at 1700, that might be what your state specifies.
Thanks. I was hoping you would see this post 2xs. I've read all your comments on other emissions threads and I knew you know your stuff. So I will check all the components/possible issues you mentioned and let you know what happens. Would cleaning the throttle body help a little? Or seafoam? I was gonna try that but my numbers seemed really high and based on your other responses to threads I figured I was way rich and those two things wouldn't really help me much.
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Old 07-11-2012, 11:47 PM   #7
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Quote:
Originally Posted by BadMojo11 View Post
Thanks. I was hoping you would see this post 2xs. I've read all your comments on other emissions threads and I knew you know your stuff. So I will check all the components/possible issues you mentioned and let you know what happens. Would cleaning the throttle body help a little? Or seafoam? I was gonna try that but my numbers seemed really high and based on your other responses to threads I figured I was way rich and those two things wouldn't really help me much.
Seafam will lower NOx readings, knocking carbon off the vales and pistons, lowering compression back to stock levels. Cleaning the throttle body wont do much, maybe increase throttle responce...
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http://www.wranglerforum.com/f330/2x...ad-490865.html
'04 SV1000s:
http://www.svrider.com/forum/showthread.php?t=280873
Old Jeep that was totaled (and SOLD!):
http://www.wranglerforum.com/f330/2x...ad-101879.html
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Old 07-13-2012, 08:01 PM   #8
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i,m in n,j same thing need new cat and o2 pass now about 750 for all of it got love it lol

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