2003 Chevy Silverado mass air flow sensor

Tiny
DOMAR248
  • MEMBER
  • 2003 CHEVROLET SILVERADO
Engine Performance problem
2003 Chevy Silverado V8 Automatic 169000 miles

my engine idles rough dying at times went to autozone they said bank 1 lean bank 2 lean said it was mass air sensor I replaced it the light went off it still idles up then idles down almost dying im getting very bad fuel milage also
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Saturday, February 6th, 2010 AT 7:03 PM

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Tiny
DENNYP
  • EXPERT
Bank 1 and 2 lean codes are usually caused from leaking intake gaskets. This would affect idle quality. I would check for leaking gaskets by spraying some air intake cleaner around the gaskets with the engine idling. If they are leaking, you will notice a change in idle speed. (Be sure to do this on a cold engine)
Also be sure to clean the inside of the throttle body. Carbon buildup will cause poor idle also.
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Saturday, February 6th, 2010 AT 8:00 PM

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