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Thread: po171 and po174

  1. #1

    Default po171 and po174

    Ok so a few weeks ago the cel came on and it was 171,174, and another which was the maf. so i changed the maf and they went away for about a week then came back on. ive sprayed carb cleaner and found nothing. The fuel filter was also changed about 2 months ago. so if someone can point me in a direction that would be great. Also if it really cold outside the truck idels really ruff until it gets warm.
    03 silverado ls model x-cab z71 w/ 5.3l.
    black lo pro toolbox
    ruff country leveling kit
    285/70/17 tera tracs
    stock 17's that are rhino lined
    5% tint

  2. #2

    Default

    could be your cat system ?!!!

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

  3. #3

    Default

    Quote Originally Posted by dshewy14 View Post
    Ok so a few weeks ago the cel came on and it was 171,174, and another which was the maf. so i changed the maf and they went away for about a week then came back on. ive sprayed carb cleaner and found nothing. The fuel filter was also changed about 2 months ago. so if someone can point me in a direction that would be great. Also if it really cold outside the truck idels really ruff until it gets warm.
    I would Inspect all Vacuum and PVC hoses .....as there could be a Vacuum leak downstream of the MAF Sensor and lasted Check the Fuel Pressure.....Also you should use......CRC MAF Sensor Cleaner Only.....went cleaner the MAF Sensor.

    CRC 05110 Mass Air Flow Sensor Cleaner - 11 Wt Oz.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  4. #4

    Default

    Thanks guys Ima look at it tommorrow n c what I can figure out. And happy new years
    03 silverado ls model x-cab z71 w/ 5.3l.
    black lo pro toolbox
    ruff country leveling kit
    285/70/17 tera tracs
    stock 17's that are rhino lined
    5% tint

  5. #5

    Default

    U can set a lean code on these motors by running w oil cap off. Need to check all stupid possibilities.there're also newer intake gaskets avail old orange ones have service bull.on them new ones should have green rubber
    2000 sierra 1500 5.3
    k&n cai
    hypertech programmer
    flowmaster catback
    7" lift 456' s. 35/12.5 nitto teragrapplers
    roll bar. Baha spare tire holder
    brush guard custom tail lights
    full sound system dvd nav

  6. #6

    Default

    well i got another new maf today and changed it, the pcv valve, and put new plugs and wires on. So far the cel has not come back on but after looking at the plugs you can tell its really running lean.
    03 silverado ls model x-cab z71 w/ 5.3l.
    black lo pro toolbox
    ruff country leveling kit
    285/70/17 tera tracs
    stock 17's that are rhino lined
    5% tint

  7. #7

    Default

    Getting lean codes for both banks, and the spark plugs are confirming the lean condition. Next thing I'd probably do would be to put a fuel pressure gauge on it and make sure the fuel system is generating enough pressure.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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