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  1. #1
    Sr. Engineer FergusonT's Avatar
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    Default p0171 p0174 '99 silverado

    SES light comes on, throws the 2 codes. A lot of search results come up with, the trucks run poorly. In my case the truck runs fine. I just installed a fuel pump/filter. My dad actually just commented on how well it runs and sounds. I plan to clean the MAF tomorrow.

    It does have an exhaust leak starting, so thinking that o2 sensor might be something.
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

  2. #2

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    Airtex pump from az? Codes happen after change?
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


  3. #3
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    Default

    with these codes when thrown at the same time is a vacuum leak. replace the PCV and make sure the hoses have no leaks cracks.

    could also be air intake hose leaking after the MAF. intake manifold gaskets typical vacuum areas of a leak issue.

  4. #4
    Sr. Engineer FergusonT's Avatar
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    Also today it was warmer than yesterday, and on my way to work the check engine light went off. Not sure if thats worth mentioning. I'm going to replace the PCV and clean the MAF today.

    Is there any certain PCV that is recommended?
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

  5. #5
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    most stores have ac delco.

    make sure the pcv valve cover rubber fixture holds the valve securely.. check hoses before going to store including the other hose that the crankcase vents to the throttlebody area.

    check that the dip stick is securely seated.

  6. #6
    Sr. Engineer FergusonT's Avatar
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    This thing is loose.....

    - - - Updated - - -

    My local advance has a Wells, Purolator, and Fram in stock. Worth it to wait for an ac delco?
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

  7. #7

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    Always worth the wait. AC Delco makes your oem parts that are built to last. Buy it on amazon if you can it will save some money.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door

  8. #8
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    I believe that is the vac solenoid valve for the fuel evap system. that hose should go to the fuel canister .

    should be an O ring seal. may appear loose but as long as it has a seal it should be not leaking.

  9. #9
    Sr. Engineer FergusonT's Avatar
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    I pulled it in the warehouse where I work and let it warm up, no fuel line chattering.
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

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