Po171

1998 TOYOTA TACOMA
215,000 MILES • 2.4L • 4 CYL • 2WD • MANUAL
Avatar
NUKEGUMBO
  • MEMBER
  • 1 POST
I am getting a lean code on my truck. Changed fuel filter, fuel pump, O2 changed less than year ago. fuel pressure forty two pounds when running. Here is the big question; There is no pressure with the key on engine off, could this cause the lean code/
Dec 7, 2016 at 9:59 PM
Advertisement
Avatar
HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
lean codes are caused by a bunch of things, vacuum leaks for one. retest fuel pressure see picture for checking. it may have a bad pressure regulator on it. also, check brake booster as they can leak causing the vacuum leak.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Dec 7, 2016 at 10:30 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.