2003 Chevy Tahoe misfire and surging

2003 CHEVROLET TAHOE
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DEBR101
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  • 1 POST
Engine Performance problem
2003 Chevy Tahoe V8 Four Wheel Drive Automatic

I have a 2003 tahoe that keeps surging and misfiring i have replaced plugs o2 sensors and cleaned throttle body it still keeps doing it now the scan tool says bank one and two burning lean what else can i try
Dec 3, 2009 at 10:50 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
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)
Dec 3, 2009 at 10:55 AM
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