Smog Help! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BoostWanted · 02-06-2012, 09:09 AM

So i've taken my smog test in my 95 S14 with the stock KA24DE. The first time I failed really bad. For 15mph The HC max is 61. I measured 306. The CO max is 0.52, I measured 4.5. The NO max is 493, and I got 616. For 25mph the HC max is 37, I got 240. For CO the max is 0.50, I got 3.84. For NO the max is 516, I got 974.

Before I took it again, I replaced the o2 sensor, I plugged in the bpt-egr hose. Put a thermostat in and found out there wasn't one before. Right before the test I just sprayed the EGR valve with carb cleaner. Then I took it on the freeway and drove it for a bit to warm it up. Drove it kind of hard.

In the test, the maxes are the same so i'll just say what I measured. @ 15mph: HC 88. CO 0.37. NO 730. @25mph HC 57. CO 0.36. NO 775.

I'm thinking I need to take out the EGR valve and fully clean as well as check the vacuum because that's what came up when I searched. I passed the CO.. but any ideas about the HC? And do you think cleaning the EGR valve will make my NO under the limit?

Thanks!

02-06-2012, 09:09 AM	#1
BoostWanted Zilvia Junkie Join Date: Jan 2012 Location: Vallejo, CA Posts: 352 Trader Rating: (5) Feedback Score: 5 reviews	Smog Help! So i've taken my smog test in my 95 S14 with the stock KA24DE. The first time I failed really bad. For 15mph The HC max is 61. I measured 306. The CO max is 0.52, I measured 4.5. The NO max is 493, and I got 616. For 25mph the HC max is 37, I got 240. For CO the max is 0.50, I got 3.84. For NO the max is 516, I got 974. Before I took it again, I replaced the o2 sensor, I plugged in the bpt-egr hose. Put a thermostat in and found out there wasn't one before. Right before the test I just sprayed the EGR valve with carb cleaner. Then I took it on the freeway and drove it for a bit to warm it up. Drove it kind of hard. In the test, the maxes are the same so i'll just say what I measured. @ 15mph: HC 88. CO 0.37. NO 730. @25mph HC 57. CO 0.36. NO 775. I'm thinking I need to take out the EGR valve and fully clean as well as check the vacuum because that's what came up when I searched. I passed the CO.. but any ideas about the HC? And do you think cleaning the EGR valve will make my NO under the limit? Thanks!