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by Anonymous on November 14th, 2008

Anonymous

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I have 2002 chevy Silvarado ext. cab Short Bed, Z-71. It has the 5.3L V-8 (323ci). The other day the MIL/SES light came on. It shows two codes: PO171 and PO174. What is my course of action to fix these problems

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Answers. 1 helpful answer below.

  • by chevymec on November 23rd, 2008

    chevymec

    Does it have a rough idle when cold that goes away as it warms up? The 2 codes are lean codes for each bank. Inspect your intake tube at the throtle body and make sure it is on and not sucking in extra air. If it is ok you are probably looking at the intake gaskets leaking. Using carb cleaner spray around the base of the intake with the motor running. If you get an increase in rpms or the motor stutters you have a vaccum leak. Go to the dealer and get a set of intake gaskets and make sure they have the green o-ring seals. The originals are orange.

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You're reading I have 2002 chevy Silvarado ext. cab Short Bed, Z-71. It has the 5.3L V-8 (323ci). The other day the MIL/SES light came on. It shows two codes: PO171 and PO174. What is my course of action to fix these problems

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