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Muffler

Discussion in 'Peterbilt Forum' started by Dougin, Jul 24, 2020.

  1. Jul 24, 2020 #1
    Dougin

    Dougin Bobtail Member

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    Jul 24, 2020
    Warren, MI
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    Last week a 2000 357 had its muffler replaced. It’s now losing power and has a hissing noise. Two injectors were changed after diagnosis. The problem is still there. The boots, air filter, fuel pump hose and turbo have been looked into for additional problems but everything seems fine. Any suggestions?
     
    Dougin, Jul 24, 2020
    Dougin, Jul 24, 2020
    #1
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  3. Jul 24, 2020 #2
    062

    062 Road Train Member

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    Most mufflers are directional. Look for a arrow,it should be pointed away from the motor. Some are stamped and others laser etched. More info about what motor would help also.
    @pushbroom @spsauerland
     
    062, Jul 24, 2020
    062, Jul 24, 2020
    #2
    Dougin and AModelCat Thank this.
  4. Jul 24, 2020 #3
    Dougin

    Dougin Bobtail Member

    7
    1
    Jul 24, 2020
    Warren, MI
    0
    It’s a Cummins engine, N14-460HP
    The direction is facing away. The feedback is: it’s okay unloaded but lacks power while loaded. I can hear the difference in sound while the truck moves around the yard but I’m unsure if that’s because it’s a new muffler or it’s chocking up a little. The engine was recently rebuilt in January of 2019 and may only have about 30,000 on it.
     
    Dougin, Jul 24, 2020
    Dougin, Jul 24, 2020
    #3
  5. Jul 24, 2020 #4
    Roberts450

    Roberts450 Road Train Member

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    Run it with out the muffler and see if the problem is still there. There might be a chance they got the wrong muffler and there is to much back pressure being created when the engine is under load since thats when the problem seems to happen. Does the truck have a single muffler or dual mufflers?
     
    Roberts450, Jul 24, 2020
    Roberts450, Jul 24, 2020
    #4
    Dougin, rolls canardly and AModelCat Thank this.
  7. Jul 24, 2020 #5
    062

    062 Road Train Member

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    Check fuel pressure,air to air,air filter etc. after the basics are checked, then find someone with a laptop to go for a ride.
    Try using the cruise control and see if it makes a difference.
     
    062, Jul 24, 2020
    062, Jul 24, 2020
    #5
    Dougin Thanks this.
  8. Aug 8, 2020 #6
    rolls canardly

    rolls canardly Road Train Member

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    mt. pocono. pa.
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    Hissing noise is excess back pressure trying to go somewhere, anywhere.
    Just un-clamp it and give it a try around the yard,
    it should be normal again, without the hiss.
    Even muffler manufacturers screw up sometimes.
    Or muffler "orderers."
    Or stock pickers.

    Try the old one and see if it works.
     
    rolls canardly, Aug 8, 2020
    rolls canardly, Aug 8, 2020
    #6
    Dougin Thanks this.
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