Smog Test Failure

NISSAN TRUCK
Avatar
BILLF106
  • MEMBER
  • 2 POSTS
my truck has passed smog for 2 years in a row, now
it failed, Smog test showed using too much gas. can
you help
Feb 12, 2006 at 10:04 PM
Advertisement
Avatar
MVANNESSJR
  • ✓Experienced Mechanic
  • 223 POSTS
Click Smog Test Preparation. Second page of that gives great prep examples. Check air filter, spark plugs, and fuel pressure. Fuel filter may have become clogged and the fuel pump is working harder than it should. Fuel injectors may need to be cleaned. Check idle air control, mass air flow sensor, and O2 sensors.

If it's burning a lot of fuel it could be a very simple solution or a combination of a few things. Remember the amount of fuel it uses depends on a few different variables (spark and oxygen).
Feb 12, 2006 at 11:21 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.