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Author
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Topic: failed smog, high NOX see image -*UPDATE, PASSED*
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the walrus
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Member # 6010
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posted
 
 
Car is basically stock 5.0, 225,000 miles. Full tune up maybe 2 years ago, the last time I had to smog it. Timing at 10*, catted h-pipe, any thoughts?
Justin
[ November 16, 2006, 08:54 PM: Message edited by: the walrus ]
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1992 LX Hatch 13.9@99, sold and bought back after 11 years and restored.
1965 FFR Cobra (sold)
2003 Mach 1 (sold)
Moved from Sac, CA to SLC, UT
Posts: 281 | From: SLC, UT | Registered: Sep 2005
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1FAST89GT
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Member # 5071
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posted
warm that bitch up!
Posts: 4915 | From: VALLEJO | Registered: May 2004
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the walrus
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Member # 6010
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posted
Dude I was on the freeway in 3rd gear trying to get it hot. Smog place is right off the freeway. Maybe I need to clean up the EGR or something.
![[Confused]](confused.gif)
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1992 LX Hatch 13.9@99, sold and bought back after 11 years and restored.
1965 FFR Cobra (sold)
2003 Mach 1 (sold)
Moved from Sac, CA to SLC, UT
Posts: 281 | From: SLC, UT | Registered: Sep 2005
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CornOil_&_Boost
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Member # 5888
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posted
quote:
Originally posted by the walrus:
Dude I was on the freeway in 3rd gear trying to get it hot. Smog place is right off the freeway. Maybe I need to clean up the EGR or something.
EGr would affect more on the HC side....more than likely a cat clogged or just needs to get hotter....
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https://www.facebook.com/pushrodpoweredmustangs
'95 Cobra - small engine / small turbo -
'02 Excursion 7.3 - tow vehicle
'14 - Chevy Volt - DD
Posts: 5097 | Registered: Jul 2005
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iceman302
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Member # 7180
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posted
Do you have an adjustable fuel pressure regulator? High NOX is usually a lean condition. I'd take the fuel pressure up a couple pounds. If not, I'd try running a tank of "Guaranteed to Pass". You should be able to find it in the fuel additives section at the local parts store. I think it's a green container/box. The car didn't miss by much so it won't take much to get it to pass.
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'65 Mustang Fastback
Posts: 4171 | From: Rancho Murieta | Registered: Oct 2006
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88DroptopGT
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Member # 2535
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The 2 year old tune up seems like the culprit for me. Believe it or not, a tune up goes a long way!
Check your spark plugs if they're fouled up or not.
Posts: 3978 | From: 707 | Registered: Mar 2003
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forced331
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Member # 1270
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posted
High nox is from running too lean. Change the plugs with stock coppers, and check to see if the cats are clogged.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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89goose
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Member # 7196
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i just got my 50 smogged last week and it didnt pass either .....on the side you have highlighted....my numbers were hella high too- the guy told me that was because of a bad EGR - the fist section on that smog sheet - i didnt pass either- he said that was because it needed a tune-up.
i havent put the new parts in yet- i will this weekend and try it again- ill post my results when i get them- if you get it to pass- can you post what the casue was ??
thanks
Posts: 174 | Registered: Oct 2006
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the walrus
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Member # 6010
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posted
***UPDATE: PASSED***
NOx came down 400 ppm on the 15 mph test. Here is what I did:
-put stock intake on (had Mac CAI on before)
-put on a different EGR that I had laying around.
-discovered rear tires were at only 20 psi(doh!), inflated to 40 psi just for the test for less rolling resistance
-oil change
-drove 2 miles on the freeway in 3rd/4th gear, tried to get the cats super hot.
Well, not sure exactly what it was but something worked:
Thanks for all the tips.
Justin
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1992 LX Hatch 13.9@99, sold and bought back after 11 years and restored.
1965 FFR Cobra (sold)
2003 Mach 1 (sold)
Moved from Sac, CA to SLC, UT
Posts: 281 | From: SLC, UT | Registered: Sep 2005
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wikaweez
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Member # 7171
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Congrats bra! I know what you were going thru... lol
Posts: 108 | From: From Da Bay to SAC/Elk G. | Registered: Oct 2006
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925five.0
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Member # 3292
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posted
i just failed smog today due to high hc's. its on a 88 cadillac btw. i am going to change the plugs and go from there.
Posts: 559 | From: -925- | Registered: Sep 2003
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