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1998 GMC Jimmy Lean bank 1 bank 2 vacunm leak plus one more

Tiny
CECIL
  • MEMBER
  • 1998 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Hi. I can not figure out why this car does not have any power. It drives very slow and with no power. The comuter signals are the oxigen sensors. I relaced one a few months back. Check engine light was still on but car was ok. I am afraid to replace both o2 and it be the fuel pump. We have 150$ budget and I cant just guess. Can replacing only one sensor cause the other sensor to go bad? Motor is good starts up fine but when it comes to driving it just wont go. No gas no power. Fuel pump is new as of 3 months ago.
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Friday, January 2nd, 2009 AT 1:55 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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)
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Friday, January 2nd, 2009 AT 2:00 PM

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