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SoCalZR1 · 05-10-2013

Are you sure it is 3.5 ppm. I just ran my 90 through California smog, no small accomplishment, and it passed NO. We are on a "dyno" and it was 388 PPM at 15 MPH and 306 at 25 MPH. Max allowed is 541 and 498 respectively.

I did swap O2 sensors last time through. Also make sure they have a fan running through the radiator if it is a hot day or your NO will shoot up. And the usual clean tank of gas, of course. I squeaked by on HC right at max, by the way.

Mike

05-10-2013	#6
SoCalZR1 Join Date: Jun 2010 Location: Southern California OC Posts: 22	Re: 1990 LT5 emissions fail Are you sure it is 3.5 ppm. I just ran my 90 through California smog, no small accomplishment, and it passed NO. We are on a "dyno" and it was 388 PPM at 15 MPH and 306 at 25 MPH. Max allowed is 541 and 498 respectively. I did swap O2 sensors last time through. Also make sure they have a fan running through the radiator if it is a hot day or your NO will shoot up. And the usual clean tank of gas, of course. I squeaked by on HC right at max, by the way. Mike