How does the vehicle run ? What fuel injection system does it have ? Check for leaking injectors or fuel pressure regulator leaking .
As long as you have no check engine light on change oil, air filter. pep boys sells a product called guaranteed to pass add to fuel make sure car is hot when you go back for emission test cold car has high hc levels it also helps to post the hc level you tested at and the limit on your receipt hope this helps
SOURCE: my chevy s10 failed emissions
Have your cat. converter checked out. I just had one of these for the same reason in my shop today.
SOURCE: CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.
nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know
SOURCE: Failed Smog Test - 4 codes for 2001 Isuzu Rodeo
Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.
SOURCE: serpentine belt replacement 1994 chevt silverado 5.7 lt
call your local autozone and the will tell you over the phone or fax you a copy
SOURCE: What all needs to be done to tune up my 1994 chevy
To do a complete tune up:
Change spark plugs and wires
If equipped with a distributor
Distributor cap and rotor
Fuel filter
Air filter
Change oil and filter
Check all other fluids.
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