SPONSORED LINKS

Engine Running Lean

Tiny
CLOROX.BLEACH
  • MEMBER
  • 2002 NISSAN ALTIMA
  • 195,000 MILES
I'm having some problems with my car throwing various codes. First off, it always throws a code that my engine is running lean. Second, it says that I have a bad speed sensor and temp sensor. That's weird because I have a new speed sensor and thermostat in it. There are no vacuum leaks on the car as I know of. The oxygen sensors are brand new as well. (Are the oxygen sensors powered my fuses in the car? I noticed that I am missing quite a few fuses in the fusebox under the hood. Wasnt sure if that was normal.) I don't have the typical symptoms of a lean running engine like stalling, rough idle, and the such, but I do idle at around 400-500 rpms. The car drives fine except at highway speeds it j erks when letting off the gas pedal.
SPONSORED LINKS
Tuesday, December 6th, 2011 AT 5:54 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks

2. EGR and PCV valve.

3. Low fuel pressure.

4. Dirty fuel injectors.

5. Mass Air Flow Sensor.

6. Oxygen Sensor.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, December 6th, 2011 AT 7:00 PM
Tiny
CLOROX.BLEACH
  • MEMBER
  • 17 POSTS
Would it hurt anything driving the car when its lean?
Was this
answer
helpful?
Yes
No
Tuesday, December 6th, 2011 AT 7:03 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No its not, but computer thinks it needs gas and gonna keep feeding it-end of results fuel economy will be down
Was this
answer
helpful?
Yes
No
Tuesday, December 6th, 2011 AT 10:07 PM

Please login or register to post a reply.

Related Engine Lean Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Lean Exhaust
GUIDE
Lean Exhaust
Common Misconception: When an engine misfires, the cylinder runs lean, not rich, this is because the air to fuel ratio favors air by 14x. Therefore, an engine must be...
VIEW MORE

Sponsored links