1999 Chevy Silverado codes 171 174

Tiny
DREW1022
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 189,000 MILES
I had these to codes pop up when I had my truck hooked up to a computer and I have lost gas milage, the truck runs fine and idles fine. But those codes mean both banks are running lean.
Saturday, December 8th, 2007 AT 3:22 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
First, you need to check the engine for any vacuum leaks. You can do this with the engine running. Spray some carb cleaner around the intake manifold gaskets and pay close attention for a change in idle quality when doing this. If it changes, you have a leak and should replace the gaskets. Be very careful not to spray any hot engine parts!This should be checked when the engine is first started after sitting overnight.
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Sunday, December 9th, 2007 AT 2:08 PM

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