Car won't pass smog..
07-22-2004, 01:01 PM
#1
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Car won't pass smog..
Hey all,
I was just wondering what I should look at first if my car (not my Subbie but my '93 Honda Prelude) doesn't pass smog.
More specifically I fail because of High NO and CO values during the 15mph test, I am fine at the 25mph test. New CA smog test = Dyno'ed runs.
I have an intake and an headers that are CARB exempt (DC sports). And I took off the Exhaust for the test.
I am thinking EGR valve / O2 sensor.
Anything else??
TIA!!
I was just wondering what I should look at first if my car (not my Subbie but my '93 Honda Prelude) doesn't pass smog.
More specifically I fail because of High NO and CO values during the 15mph test, I am fine at the 25mph test. New CA smog test = Dyno'ed runs.
I have an intake and an headers that are CARB exempt (DC sports). And I took off the Exhaust for the test.
I am thinking EGR valve / O2 sensor.
Anything else??
TIA!!
Last edited by Badfish; 07-22-2004 at 07:15 PM.
07-22-2004, 01:03 PM
#2
Originally Posted by Badfish
Hey all,
I was just wondering what I should look at first if my car (not my Subbie but my '03 Honda Prelude) doesn't pass smog.
More specifically I fail because of High NO and CO values during the 15mph test, I am fine at the 25mph test. New CA smog test = Dyno'ed runs.
I have an intake and an headers that are CARB exempt (DC sports). And I took off the Exhaust for the test.
I am thinking EGR valve / O2 sensor.
Anything else??
TIA!!
I was just wondering what I should look at first if my car (not my Subbie but my '03 Honda Prelude) doesn't pass smog.
More specifically I fail because of High NO and CO values during the 15mph test, I am fine at the 25mph test. New CA smog test = Dyno'ed runs.
I have an intake and an headers that are CARB exempt (DC sports). And I took off the Exhaust for the test.
I am thinking EGR valve / O2 sensor.
Anything else??
TIA!!
did you reset your ECU after you took off those exhaust parts? You might be running really rich.
I passed with my civic running a steep cam. but that was pre dyno.
07-22-2004, 01:18 PM
#3
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If your car is now in stock form I would take it into the dealer. CA law stipulates that all smog equipment be covered for 5 years... I think. With high NOx I would reccomend replacing your O2 sensor and try running some feul injector cleaner through as well.
-Chris
-Chris
07-22-2004, 08:44 PM
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Originally Posted by Ex-ricer
Why do you hafta smog an '03? CA law says 4 years or older :confused
07-22-2004, 09:14 PM
#9
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Maybe your timing? I know of quite a few people who have had their Integra fail smog and it was just a timing issue. I forget what the result was on the smog test tho 
07-22-2004, 09:19 PM
#10
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Sorry had to edit... not '03 but '93
Originally Posted by Ex-ricer
Ah, so now he's just trying to make me look like an idiot? It's not that hard 
07-22-2004, 09:23 PM
#11
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Thanks for everyone's responses, you fellow I-clubers are awesome!
After the responses you have confirmed my thoughts..
I think I'm going to change the o2 sensor first and then the EGR valve. Maybe then do a minor tuneup/ FI cleaner .
Hopfully after all that it'll pass smog..
Thanks again all
After the responses you have confirmed my thoughts..
I think I'm going to change the o2 sensor first and then the EGR valve. Maybe then do a minor tuneup/ FI cleaner .
Hopfully after all that it'll pass smog..
Thanks again all
07-22-2004, 09:29 PM
#12
check your timing...make sure is rite....
get some injector and fuel systems clearner....
change the spark plugs... (it shouldnt cost that much)
check the cap and rotor...make sure is still good...
a lot of time because of carbon build up inside the combustion chamber will cause high NOX...
try those and get it pretest again ...
get some injector and fuel systems clearner....
change the spark plugs... (it shouldnt cost that much)
check the cap and rotor...make sure is still good...
a lot of time because of carbon build up inside the combustion chamber will cause high NOX...
try those and get it pretest again ...
07-22-2004, 09:34 PM
#13
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One of my brother's cars is a '91 non-Suby that wouldn't pass smog. A shop told him it was likely the catalytic converter. I told him that changing the O² sensor was a cheap possible fix if it wasn't the cat so he tried it. Still couldn't pass smog. He brought it to a shop who fitted a new higher flow (compared to OEM) converter and it passed smog with flying colors. He also says that apparently the OEM converter was so clogged that he immediately noticed that his car ran stronger after leaving the repair garage.
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07-22-2004, 09:46 PM
#14
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with high NO makesure your timing isnt too advanced, also is your DC headers the old type that only reads off one ofthe primary runners? If so you might want to weld bung into the lower collector so it can get a reading from all four since the old DC headers were notorious for bad O2 readings because they only read off one cylinder