This is topic failed smog, high NOX see image -*UPDATE, PASSED* in forum Tech Talk at Northern California Ford Owners  .


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Posted by the walrus (Member # 6010) on :
 
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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Posted by 1FAST89GT (Member # 5071) on :
 
warm that bitch up!
 

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Posted by the walrus (Member # 6010) on :
 
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.


 

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Posted by jordan_0806 (Member # 5888) on :
 

quote:

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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.

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EGr would affect more on the HC side....more than likely a cat clogged or just needs to get hotter....
 

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Posted by iceman302 (Member # 7180) on :
 
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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Posted by 88DroptopGT (Member # 2535) on :
 
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.
 

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Posted by forced331 (Member # 1270) on :
 
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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Posted by 89goose (Member # 7196) on :
 
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
 

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Posted by the walrus (Member # 6010) on :
 
***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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Posted by wikaweez (Member # 7171) on :
 
Congrats bra! I know what you were going thru... lol
 

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Posted by 925five.0 (Member # 3292) on :
 
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.
 

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