T O P I C R E V I E W
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the walrus
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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1FAST89GT
Member # 5071
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posted
warm that bitch up!
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the walrus
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.
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jordan_0806
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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iceman302
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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88DroptopGT
Member # 2535
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posted
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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forced331
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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89goose
Member # 7196
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posted
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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the walrus
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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wikaweez
Member # 7171
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posted
Congrats bra! I know what you were going thru... lol
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925five.0
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.
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