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  1. #1

    Default "Service Engine Soon" light

    Hello guys, I'm new to this sight although I have utilized similar forums in the past for other vehicles that I had (Fords). I have come full circle and returned to a GM product after having driven Ford products for the past ten years. The problem I am having is that I recently purchased a 1993 GMC Sierra 5.0L 4x4 after selling a 2001 Ford Mustang GT. The Sierra has been smoking slightly when first cranked as if valve ring seals need replacing which I intend to fix as soon as the hunting season here in Georgia is finished at the end of December. The other day while driving the vehicle a "Service Engine Soon" light came on and stayed on. The truck was due an oil change so I changed the oil, unplugged the battery for about fifteen minutes to reset the ECU, and then plugged the battery back up and cranked the truck back up. The truck ran for about five minutes without the light on and the light then came on again. I have noticed no differences in the way the vehicle drives or any other performance issue that would relate what this light is about. I have not yet tried to pull a code on the truck and wasn't really sure if that could be done on this vehicle as the only Chevy's I have ever had were older (70's and 80's) models and I have been working on the Modular Ford motors that I have owned for the past ten years. I am not completely sure what the issue could be, other then possibly an o2 sensor, however, less simply throwing money at the problem and hoping it fixes my problem I have no idea where to begin. I also thought that maybe the issue was a fouled plug(s) from the smoking but as I said before I really am not sure. Any help or advice would be greatly appreciated.

  2. #2
    Legend unplugged's Avatar
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    Default

    Welcome to the site. Check out this link for how to read the codes and let us know what you find: http://www.troublecodes.net/GM/
    There is no way to happiness....happiness is the way.:yipi:
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    High Desert SoCal
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  3. #3

    Default

    Welcome to the site!


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  4. #4
    Legend
    Eddie Z71's Avatar
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    Default

    Hi, and welcome to the site! Glad to have you here!
    Eddie , 2000 Chevy Tahoe Z71 (old style)

  5. #5

    Default

    Welcome to the site!

    Bobby - North Carolina
    2008 4x4 5.3L V8
    6" Suspension Lift and 1.5" Body Lift
    20x9 Ballistic Jesters w/35" Toyo Open Country MT's & 1.5" rear wheel spacers
    4:56 Yukon Gears
    Hypertech Speedometer Calibrator
    Baja style bed mount spare tire carrier
    Flowmaster 40 series dual exhaust
    Recon Smoked LED tails/3rd brake lights/black projectors w/switchback LED's in the corners
    N-Fab Nerf Steps
    K&N CAI
    No Fear Pedals
    Tint, Line-X bedliner, Window visors, Rear wheel well liners
    Painted front grill, bow ties and door badges, de-"lettered" tailgate
    Powder coated front and rear bumpers

  6. #6

    Default

    Thanks for the trouble code info. I think I can at least diagnose the issue now. If I have any other questions I will let you guys know. Thanks.

  7. #7

    Default

    should run the code on it first with more information.

  8. #8

    Default

    Welcome to the forum!!
    If you find yourself slipping,.....tie a knot.....hold on tight

    Black
    2008 silverado
    1500 crew cab
    5.3 L 4x4
    Borla exhaust, rbp black tip
    tint, bed liner
    2.25 in ready lift leveling kit
    18x9 rbp 94r
    33x12.5x18 toyo mts

  9. #9
    Jr. Engineer
    97chevz71's Avatar
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    May 2009
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    Perry County, Pennsylavania
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    Default

    What i would do is when you park it for the night take the gas cap off. then when you get up in the morning put it back on with at least 10 clicks then it should turn off after 5 minutes. if this is not the case then go to autozone and have then run the codes for free.

  10. #10
    Master Mechanic
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    Welcome to the site!

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