2005 Chevy Colorado running lean.

Tiny
AZROLEMODEL
  • MEMBER
  • 2005 CHEVROLET COLORADO
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 18,000 MILES
I have a 05 colorado 4wd. New feul pump and filter and keeps throwing code, running too lean. What elese can I do? Thanks in advance.
Thursday, October 23rd, 2008 AT 11:03 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi azrolemodel and welcome to 2carpros

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Friday, October 24th, 2008 AT 2:38 AM

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