CA Failed SMOG, suggestions? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

denkigrve · 01-20-2010, 02:39 PM

So I just picked up an 89 s-chasis with a stock SOHC (has hotshot header and magnaflow exhaust) and it totally failed SMOG.

I failed for NO (PPM). At 15 MPH the car was pushing out 1928. At 25 it was at 1600.

Any suggestions on what to check/do to get this thing to pass?

One thing I'm not sure if it's contributing or not, the idle jumps between 600 and 900, not sure if a timing issue could be the cause of all of this.

HC was at 22 and 17. CO was at .01 and .01. So I'm not sure what to look at first. Should I pick up a stock cat-back and see if that helps? Is it the odd idle issue? Is it a timing issue? Is it dumping too much fuel?

01-20-2010, 02:39 PM	#1
denkigrve Join Date: Jan 2010 Location: Bay Area, CA Age: 43 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	CA Failed SMOG, suggestions? So I just picked up an 89 s-chasis with a stock SOHC (has hotshot header and magnaflow exhaust) and it totally failed SMOG. I failed for NO (PPM). At 15 MPH the car was pushing out 1928. At 25 it was at 1600. Any suggestions on what to check/do to get this thing to pass? One thing I'm not sure if it's contributing or not, the idle jumps between 600 and 900, not sure if a timing issue could be the cause of all of this. HC was at 22 and 17. CO was at .01 and .01. So I'm not sure what to look at first. Should I pick up a stock cat-back and see if that helps? Is it the odd idle issue? Is it a timing issue? Is it dumping too much fuel?