Barely failed a smog test i need help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Fonzs13 · 05-14-2012, 09:22 PM

So its that time of the year were i had to go smog my s13, the car passed the 15 mph test but failed at the 25 mph....on the bottom are the results for the 25mph test

%CO2
Meas-14.2
%O2
Meas-0.6

HC
Max-65
Meas-71

CO
Max-0.44
Meas-0.04

NO
Max-516
Meas-519

Should i just buy a new cat since it hasnt been replace in forever the stock OEM one is still there Lol...any help would be greatly appreciated thanks guys

S-Nation S13 · 05-14-2012, 09:35 PM

Yes with those numbers cat will fix your problems..

Gar9854 · 05-14-2012, 09:41 PM

Retard the timing and ask the inspector to do the 25/25 in second

Fonzs13 · 05-14-2012, 10:00 PM

I have the timing set to 22 degrees, and how much should i retard it?

bad dog · 05-15-2012, 09:13 AM

when i rodding cars i would put-- 1/4 tank shell gas --4 bottles 90% isopropyl alcohol in gas tank , get it at any drug store.

no problem passing .

05-14-2012, 09:22 PM	#1
Fonzs13 Leaky Injector Join Date: Apr 2009 Location: Oxnard,CA Age: 36 Posts: 88 Trader Rating: (0) Feedback Score: 0 reviews	Barely failed a smog test i need help So its that time of the year were i had to go smog my s13, the car passed the 15 mph test but failed at the 25 mph....on the bottom are the results for the 25mph test %CO2 Meas-14.2 %O2 Meas-0.6 HC Max-65 Meas-71 CO Max-0.44 Meas-0.04 NO Max-516 Meas-519 Should i just buy a new cat since it hasnt been replace in forever the stock OEM one is still there Lol...any help would be greatly appreciated thanks guys

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05-14-2012, 09:35 PM	#2
S-Nation S13 Post Whore! Join Date: Jan 2008 Location: LAND of the LOST Posts: 4,083 Trader Rating: (92) Feedback Score: 92 reviews	Yes with those numbers cat will fix your problems..

05-14-2012, 09:41 PM	#3
Gar9854 Zilvia Member Join Date: Oct 2011 Location: Atlanta Posts: 172 Trader Rating: (0) Feedback Score: 0 reviews	Retard the timing and ask the inspector to do the 25/25 in second

05-14-2012, 10:00 PM	#4
Fonzs13 Leaky Injector Join Date: Apr 2009 Location: Oxnard,CA Age: 36 Posts: 88 Trader Rating: (0) Feedback Score: 0 reviews	I have the timing set to 22 degrees, and how much should i retard it?

05-15-2012, 09:13 AM	#5
bad dog Leaky Injector Join Date: Dec 2010 Location: az Posts: 90 Trader Rating: (0) Feedback Score: 0 reviews	when i rodding cars i would put-- 1/4 tank shell gas --4 bottles 90% isopropyl alcohol in gas tank , get it at any drug store. no problem passing .