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2003 tundra misfires

Discussion in '1st Gen Tundras (2000-2006)' started by Dadof5boys, May 30, 2020.

  1. May 30, 2020 at 6:27 AM
    #1
    Dadof5boys

    Dadof5boys [OP] New Member

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    Hello. I am new to the forum. I have a 2003 Tundra limited 4.7L. I am getting randome misfires on cylinder 4 and 6. Compression test is 145 on each of those cylinders and 180 on cylinder 2 and 8. I took it to a garage and they did a leak down test but told me no head gasket failure. New spark plugs we installed, could packs were swapped from one side to the other and timing was checked. Everything I'm seeing is pointing to head gasket between those cylinder . I do not have my own leak down tester but I can put shop air into the cylinders using the compression tester hose. Any advice on where to look next or how to check for head gasket leak using air and compression hose?
     
  2. May 30, 2020 at 6:29 AM
    #2
    TokerJoker

    TokerJoker ΜΟΛΩΝ ΛΑΒΕ

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    Howdy from DFW and :worthless:
     
  3. May 30, 2020 at 7:09 AM
    #3
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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    HG failures are extremely rare on these. Did the truck overheat?
     
  4. May 30, 2020 at 7:24 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    How many miles on truck?
     
  5. May 30, 2020 at 7:27 AM
    #5
    Dadof5boys

    Dadof5boys [OP] New Member

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    139000 miles. I bought it from my dad. It overheated for him and turned out to be the trans cooler went on the truck and the coolant leaked with the transmission fluid. Both systems were flushed twice and a new radiator was Installed. He pulled over as soon as he noticed it overheated. The truck runs great except a rough idle and only misfires at idle.
     
  6. May 30, 2020 at 7:58 AM
    #6
    Lil Steve

    Lil Steve Living the dream

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    Give this a try... disconnect the coil wire to 4/6 one at a time and see if the misfire/rough idle gets worse. If it doesn't, or is intermittent, swap those coils onto other cylinders to see if the problem follows. If the problem follows to the cylinders you swapped to, you've got a bad coil/coils. What's the condition of the spark plugs?
     
    bmf4069 likes this.
  7. May 30, 2020 at 8:03 AM
    #7
    Dadof5boys

    Dadof5boys [OP] New Member

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    I already swapped the coils from one side to the other and the misfires stayed on 4 and 6. So that should rule out a bad coi . Spark plugs are new.
     
    Pucks18 likes this.
  8. May 30, 2020 at 8:18 AM
    #8
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    http://www.agcoauto.com/content/news/p2_articleid/286

    These misfire problems are a hard one to solve. We get a few members with these same scenarios. It could be many things, but the fact that your engine overheated does not bode well. The compression on 4/6 is low. Could be a crack between the two.
     
  9. May 30, 2020 at 8:23 AM
    #9
    Dadof5boys

    Dadof5boys [OP] New Member

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    Head gasket crack between the 2 cylinders? That's what I'm thinking to but the garage I had it at did a leak down test and didn't see signs of a head gasket. Could it be a small leak that wasnt detected? I even tried K-seal head gasket repair and that brought the comprrssiin on 4 and 6 from 90 PSI up to the 145 that I have now.
     
  10. May 30, 2020 at 9:24 AM
    #10
    PCJ

    PCJ New Member

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    There's your answer. You have a blown head gasket. That compression information would have been useful in the first post.
     
  11. May 30, 2020 at 9:27 AM
    #11
    Dadof5boys

    Dadof5boys [OP] New Member

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    Is there a way that I can test to confirm using the hose from the compression tester? I can hook shop air up to that hose. How much PSI is ok to put into the system and so the cylinder stroke need to be in the up position or wont it matter. There is no oil in the coolant and no coolant in the oil.
     
  12. May 30, 2020 at 10:58 AM
    #12
    PCJ

    PCJ New Member

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    Your initial compression test results of 90 pounds already confirmed a blown head gasket. It's most likely just blown between cylinders that's why there is no fluid transfer. There is no chemical repair for a blown head gasket. Head removal is the only proper repair.
     
  13. May 30, 2020 at 11:27 AM
    #13
    Dadof5boys

    Dadof5boys [OP] New Member

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    So if I put compressed air into cylinder 4 I should get air coming out of cylinder 6?
     
  14. May 30, 2020 at 1:41 PM
    #14
    noahrexion

    noahrexion New Member

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    Yes. Put 100psi in and you'll hear it.

    Also, you have a blown gasket. Have you put may miles on it since all this went down? How is the tranny shifting? Assuming you bought it from your father for a song; at 139k it is very worth sinking the money into to repair this properly - whether you do it yourself for $500 for pay someone $1500 if you know what I mean.
     
  15. May 30, 2020 at 1:49 PM
    #15
    Dadof5boys

    Dadof5boys [OP] New Member

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    Ok. I'll try that. I haven't even put 1,000 miles on it. I gave him $4500 for it tranny is shifting ok except if I really punch it going down the road it wants to buck a little. But I'm assuming that is due to the misfires/head gasket issue.
     
  16. May 30, 2020 at 2:15 PM
    #16
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Yeah. Get a new rebuilt/reman’d engine or one from a rust bucket with low(er) miles and drop it in.
     
    Tundra2 likes this.

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