emissions fail..;( - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

hapkido39 · 10-15-2002, 10:56 AM

well had my canadian emisions test dont today and failed miserably especially the co reading they were 8 times the allowable level.anyone have any advice,tune up?it has new plugs maybe an o2 sensor or catalytic convertor..any help would be appreciated

turbo240sx · 10-15-2002, 11:02 AM

mine failed too "s-13" i had a gutted cat and had it running real rich. i leaned out the TPS sensor"throttle position sensor"
to .38 and retarted timing,5 degrees and alot of dry gas. passed with flying colors. hope this helps. oh yeah let the car run hot dont turno on the heat, the hotter it runs the cleaner the pipe sniffer see's

240sxtreme · 10-15-2002, 12:06 PM

my 92 didn't pass this last time either, the numbers where way too high...took it to my mechanics, had them run diagnostics, they put a new cat on, and all the numbers dropped by almost 1/2.

A good cat is probably the best thing for emissions.  

I suggest doing what I do, run with 1 cat, and 1 in storage somewhere...when it comes time to doing emissions, put the cat you had in storage on...since it's barely used....it'll pass with flying colors..afterwards, go and switch cats again.  You'll always pass this way....unless your engine is really running like crap.

misnomer · 10-15-2002, 01:37 PM

Move somewhere that doesn't have emissions. . .

AKADriver · 10-15-2002, 02:06 PM

High CO is typically caused by a rich condition, how was your HC reading?  Close to the limit?  Ideally you want low numbers for all three (like my car&#33<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='

'>.  Yeah having no tests would be nice, but hey, consider it a clue that your car needs some maintenance.  A car that's running right should never fail unless it's heavily modified.

Did it fail at idle or at speed?

Try the basics first.  Clean the MAF and AIV.  Check your idle speed (IAA valve) if it's idle where you failed.

hapkido39 · 10-15-2002, 03:21 PM

It passed at idle and failed at speed miserably especially the co the rest of the readings were close

10-15-2002, 11:02 AM	#2
turbo240sx Zilvia Member Join Date: Oct 2002 Location: CT Posts: 166 Trader Rating: (0) Feedback Score: 0 reviews	mine failed too "s-13" i had a gutted cat and had it running real rich. i leaned out the TPS sensor"throttle position sensor" to .38 and retarted timing,5 degrees and alot of dry gas. passed with flying colors. hope this helps. oh yeah let the car run hot dont turno on the heat, the hotter it runs the cleaner the pipe sniffer see's __________________ 240sx s-13 TURBO weekend v-8 killer 90 Talon TSI WARNING.THIS CAR IS EQUIPPED WITH A TURBOCHARGER. DUE TO POSSIBLE BREATHING PROBLEMS UNDER HEAVY ACCELERATION, ALL FEMALES ARE ADVISED TO REMOVE ANY TIGHT FITTING OR RESTRICTIVE CLOTHING FOR SAFETY.

10-15-2002, 01:37 PM	#4
misnomer Nissanaholic! Join Date: Jul 2001 Location: Nevada Posts: 2,293 Trader Rating: (0) Feedback Score: 0 reviews	Move somewhere that doesn't have emissions. . . __________________ Rowsdower saves us and saves all the world!

10-15-2002, 02:06 PM	#5
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,518 Trader Rating: (1) Feedback Score: 1 reviews	High CO is typically caused by a rich condition, how was your HC reading?  Close to the limit?  Ideally you want low numbers for all three (like my car&#33<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=''>.  Yeah having no tests would be nice, but hey, consider it a clue that your car needs some maintenance.  A car that's running right should never fail unless it's heavily modified. Did it fail at idle or at speed? Try the basics first.  Clean the MAF and AIV.  Check your idle speed (IAA valve) if it's idle where you failed.

10-15-2002, 10:56 AM	#1
hapkido39 Join Date: Oct 2002 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	well had my canadian emisions test dont today and failed miserably especially the co reading they were 8 times the allowable level.anyone have any advice,tune up?it has new plugs maybe an o2 sensor or catalytic convertor..any help would be appreciated

10-15-2002, 12:06 PM	#3
240sxtreme Zilvia Junkie Join Date: Oct 2001 Location: Portland, OR Age: 48 Posts: 386 Trader Rating: (0) Feedback Score: 0 reviews	my 92 didn't pass this last time either, the numbers where way too high...took it to my mechanics, had them run diagnostics, they put a new cat on, and all the numbers dropped by almost 1/2. A good cat is probably the best thing for emissions.   I suggest doing what I do, run with 1 cat, and 1 in storage somewhere...when it comes time to doing emissions, put the cat you had in storage on...since it's barely used....it'll pass with flying colors..afterwards, go and switch cats again.  You'll always pass this way....unless your engine is really running like crap.

10-15-2002, 03:21 PM	#6
hapkido39 Join Date: Oct 2002 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	It passed at idle and failed at speed miserably especially the co the rest of the readings were close