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Intermittent sputtering dash lights

Discussion in '2nd Gen Tundras (2007-2013)' started by Troyfromaustin, Jun 27, 2024.

  1. Jun 27, 2024 at 10:06 AM
    #1
    Troyfromaustin

    Troyfromaustin [OP] New Member

    Joined:
    Jun 27, 2024
    Member:
    #119058
    Messages:
    3
    Gender:
    Male
    Vehicle:
    5.7 L Tundra 2WD 185,000 miles
    So my truck has been in 5 mechanic shops.....the last was Toyota service dept. and they said it's a fuel pump assembly issue and wanted $1750 to repair.
    This truck will run perfectly, then out of the blue (usually on startup but not always) will begin misfiring like a bad plug or cylinder out. Dash traction light, VSC off and check engine light all on. I'll park it when I get home then start it the next morning and it runs fine...no problems but the dash lights remain on.
    Anyone have a clue what's going on with this sick old Japanese lady?
    Mechanics have changed the plugs and air injection pumps.
     
  2. Jun 28, 2024 at 12:15 PM
    #2
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,715
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    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Maybe the fuel ecu or relay?? Cutting fuel to the engine?
     
  3. Jul 4, 2024 at 11:48 AM
    #3
    Troyfromaustin

    Troyfromaustin [OP] New Member

    Joined:
    Jun 27, 2024
    Member:
    #119058
    Messages:
    3
    Gender:
    Male
    Vehicle:
    5.7 L Tundra 2WD 185,000 miles
    Their saying now that it's the ECM. After another week of testing that's the diagnosis. Took a long time because they had to wait till it ran rough....slow process. Does anyone know where the ECM on this truck? Is it difficult to get to?
     
  4. Jul 4, 2024 at 4:12 PM
    #4
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,715
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    ECM is passenger side firewall. Pretty easy.. Never had to pull it out though
     
  5. Jul 5, 2024 at 12:31 PM
    #5
    Troyfromaustin

    Troyfromaustin [OP] New Member

    Joined:
    Jun 27, 2024
    Member:
    #119058
    Messages:
    3
    Gender:
    Male
    Vehicle:
    5.7 L Tundra 2WD 185,000 miles
    Thank you I found it. Yes, it doesn't look crazy hard to access. Drove the truck a short distance yesterday and evidently it (bad ECM) is effecting the transmission now, so it's progressively getting worse. I bought a refurbished one from Flagship in New York online for $465. Talked about 30 minutes to the owner, he had a lot great information. One being that the ECMs on that type truck begins weakening after 15 years.
     

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