Smog test results and the meaning

Tiny
MIKESANJOSE
  • MEMBER
  • CHEVROLET TAHOE
I have a 97 Tahoe with 119K and have taken pretty good care of it since it was new. Just had it smogged under California's Enhanced program. It passed, but all the numbers were well above the "Average" and about 70% of the maximum. HC (measured 71;max of 103) CO (measured.47; max.58) NO (measured 623; max 986). It's due for a tune-up but do these numbers imply a bigger engine problem then a simple tune-up? Valve job perhaps?
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Monday, August 27th, 2007 AT 3:26 PM

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Tiny
2CEXPT
  • MEMBER
Give it a major tune-up-the only thing I see is partly burn fuel- and change your oil.
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Monday, August 27th, 2007 AT 3:39 PM

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