1999 CHEVY SILVERADO CODE P0171

  • Tiny
  • Lbolton
  • 1999 CHEVROLET SILVERADO

Computer problem
1999 Chevy Silverado V8 Two Wheel Drive Automatic 371000 miles

I own a 1999 Silverado 1500 5.3L V8. All the oxygen sensors, MAP, and MAF sensors have been replaced in the past 5-6 months. Every few days I get the code P0171 lean on bank 1. What should I do next to correct the problem?

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Sunday, March 15th, 2009 AT 9:41 AM

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  • Tiny
  • Merlin2021
  • EXPERT
  • 17,584 POSTS

You may have a vacuum leak, get a can of spray throttle body cleaner, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! also check the ECT(engine coolant temp) sensor.


http://www.2carpros.com/forum/automotive_pictures/62217_CRC_Throttle_Body_16.jpg

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Sunday, March 15th, 2009 AT 10:04 AM

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