S13 Smog check help 2009 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kenji001 · 08-10-2009, 11:37 AM

I have a 1993 S13 Hatchback with 257K miles.

My result:

Test 15MPH
HC: MAX 88 AVE 21 MEAS 113
CO(%): MAX 0.52 AVE 0.06 MEAS 0.35
NO(PPM): MAX 704 AVE 150 MEAS 929

Test 25MPH
HC: MAX 53 AVE 13 MEAS 63
CO(%): MAX 0.50 AVE 0.05 MEAS 0.18
NO(PPM): MAX 738 AVE 136 MEAS 322

I failed NO in 15mph test and HC in both 15mph & 25mph tests.

Here is my result from last year:
S13 Smog check help: KA24ET / KA24DET Forum: Nissan Forums / Infiniti Forums - NICOclub

What I did before the smog test:

1) oil change
2) Retard ignition timing to 15 BTDC.
3) With under a 1/4 of gas, I poured in 2 gallons of denatured alcohol.

When retarding timing, I tried to adjust the idle screw to 650 rpm with TPS sensor disconnected. However, I turned the idle screw to clockwise max. My digital timing light still says it is about 760rpm. The idle was rough and sometime stalled my car. So I turned counter-clockwise a little. The idle rpm is about 800 rpm. Then, I rotated my distributor counter-clockwise to retard my timing to about 15 BTDC. My idle was still fluctuate sometimes (500rpm then to about 700-800rpm for about 2 seconds).

Did I do this correctly? Please advise.

The EGR valve is working, but I didn't take it out and clean it. The cat looks like of old. I didn't do anything with the cat.

Reference:

1991-1994 240sx: Setting adjusting idle tutorial: Nissan Online Mechanic: Nissan Forums / Infiniti Forums - NICOclub
1991-1998 240sx: Timing Light Tutorial: 240SX Forum / 180SX Forum / Silvia Forum: Nissan Forums / Infiniti Forums - NICOclub

Kenji001 · 08-10-2009, 12:31 PM

I forgot to mention that I also failed:

Ignition timing: 15 BTDC
Fuel Cap Functional

For ignition timing, I adjusted it to 20 BTDC already. How about fuel cap functional? Do I just need to buy a new gas cap?

Thanks!

fast-datsun · 08-10-2009, 01:30 PM

EGR bad or need cleaned , possable bad CAT, NEED NEW CAP IF THAT'S WHAT FAILED..

blackrms13 · 08-10-2009, 02:15 PM

oh yeah...forgot to mention..

even if u lift the valve on the EGR, and the engine dies out, that does not 100% mean the EGR is working....

then again ur numbers arent that far off...so i duno

08-10-2009, 11:37 AM	#1
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 309 Trader Rating: (0)	S13 Smog check help 2009 I have a 1993 S13 Hatchback with 257K miles. My result: Test 15MPH HC: MAX 88 AVE 21 MEAS 113 CO(%): MAX 0.52 AVE 0.06 MEAS 0.35 NO(PPM): MAX 704 AVE 150 MEAS 929 Test 25MPH HC: MAX 53 AVE 13 MEAS 63 CO(%): MAX 0.50 AVE 0.05 MEAS 0.18 NO(PPM): MAX 738 AVE 136 MEAS 322 I failed NO in 15mph test and HC in both 15mph & 25mph tests. Here is my result from last year: S13 Smog check help: KA24ET / KA24DET Forum: Nissan Forums / Infiniti Forums - NICOclub What I did before the smog test: 1) oil change 2) Retard ignition timing to 15 BTDC. 3) With under a 1/4 of gas, I poured in 2 gallons of denatured alcohol. When retarding timing, I tried to adjust the idle screw to 650 rpm with TPS sensor disconnected. However, I turned the idle screw to clockwise max. My digital timing light still says it is about 760rpm. The idle was rough and sometime stalled my car. So I turned counter-clockwise a little. The idle rpm is about 800 rpm. Then, I rotated my distributor counter-clockwise to retard my timing to about 15 BTDC. My idle was still fluctuate sometimes (500rpm then to about 700-800rpm for about 2 seconds). Did I do this correctly? Please advise. The EGR valve is working, but I didn't take it out and clean it. The cat looks like of old. I didn't do anything with the cat. Reference: 1991-1994 240sx: Setting adjusting idle tutorial: Nissan Online Mechanic: Nissan Forums / Infiniti Forums - NICOclub 1991-1998 240sx: Timing Light Tutorial: 240SX Forum / 180SX Forum / Silvia Forum: Nissan Forums / Infiniti Forums - NICOclub

08-10-2009, 02:15 PM	#4
blackrms13 Nissanaholic! Join Date: Jul 2007 Location: 626/Riverside Posts: 1,860 Trader Rating: (9)	oh yeah...forgot to mention.. even if u lift the valve on the EGR, and the engine dies out, that does not 100% mean the EGR is working.... then again ur numbers arent that far off...so i duno __________________ 91' 240sx Fastback

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08-10-2009, 12:31 PM	#2
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 309 Trader Rating: (0)	I forgot to mention that I also failed: Ignition timing: 15 BTDC Fuel Cap Functional For ignition timing, I adjusted it to 20 BTDC already. How about fuel cap functional? Do I just need to buy a new gas cap? Thanks!

08-10-2009, 01:30 PM	#3
fast-datsun Leaky Injector Join Date: Aug 2002 Posts: 107 Trader Rating: (0)	EGR bad or need cleaned , possable bad CAT, NEED NEW CAP IF THAT'S WHAT FAILED..