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  1. #1

    Default 03 burb new muffler and cel

    I just put a flowmaster 50 on my 03 burb 1500 5.3 and on the way home the cel or ses light came on. What would cause this??


  2. #2


    Did you check the codes?

  3. #3
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
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    X2 on STB post on checking the codes. If you don't know how, then I would check & see if they ripped, wrecked, or ruint your 02 sensor when they installed the muffler.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  4. #4


    it got worse, I had a problem with it idleing rough. I thought I had that under control but appearently not. This morning on the way to work I stopped to get a coffee and while waiting it started the random misfire crap again. Im done throwing parts at it so I dropped it off at the stealership and they will do a full diognostic on it in the morning. I think it was just a coincident that it came up at the time of the muffler.

    I will post up the problem and fix

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