didn't pass smog, bad air/fuel ratio

[Gollum]

ok, the machine measured a 17: air/fuel raio mix on the 25 mph test, the 15 mph test had a slightlly better air/fuel ratio. Any ideas on what it might be?

 

The HC was 82 and 61 both about 60% of MAX.

 

The CO was 1.47 and 1.44 about 150% of MAX

 

The NO (aka NOX, the new gas tested for) was 68 and 108 about 10% of MAX. EXTREMELY LOW!!! WOW for those that didn't know this gas is mostlly determined by the heat of the burn and generally the higher the compression the harder it is to pass. My friend who smogged it said it felt like it was misfiring wich might contribute to why it was so low. But still, I could put some huge injectors in and a new fuel rail and still pass i'll bet. This makes me happy as it also confirms the mileage on the engine, noting that there is almost none if not any carbon build up inside. I'm as giddy as a school girl.

 

Anyways, I hope it's something as painless as the fuel filter or O2 sensor.

 

The other readings for those curous were CO2 10.7 and 11.6. The O2 was 5.0 and 3.6

 

And for those who didn't realise, i'm in california.

[Gollum]

ok, so i was thinking that i'd check the fuel filter till i had some other ideas from other people.... I feel so dumb... i can't find it. It should be right before the pump right? Is it an in tank filter? And could such a low milage ZX have a dirty fue filter (25k miles)?

 

hmm, i'm still totally lost. My bone head brother that doesn't actually enjoy working on his own cars keeps saying "it needs a tune up, just let someone who knows what they're doing take care of it." Well, with a tune up they only check and change timing correct? My buddy checked my timing before he smogged it and he said the timing was fine, but i'm still running lean. I can't see how a tune would help... any thoughts?