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01 Tundra 4.7L Bank 1 misfire codes

Discussion in '1st Gen Tundras (2000-2006)' started by JAM Auto, May 8, 2020.

  1. May 8, 2020 at 12:49 PM
    #1
    JAM Auto

    JAM Auto [OP] New Member

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    Jamie
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    2001 Tundra Limited
    None
    Hi all, I have been on here prior. Still working on my truck. My problem: p0300, p0301, p0303 & p0305 codes. New coils, new spark plugs, new timing belt (yes, all in time), compression 200psi average - all cylinders, check injector resistance, new fuel filter, cleaned throttle body, all electrical connections & vac hoses tight, check cam sensor resistance good. Saw a thread where a cam sprocket pin had sheered - possible I guess. Bad gas? I am in process of draining tank. Exhaust restriction? Can anybody help? Going nuts!
    Thanks,
     
    Tundra2 likes this.
  2. May 10, 2020 at 5:18 PM
    #2
    zgurrola21

    zgurrola21 New Member

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    Zyan
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    2001 Toyota Tundra SR5 TRD OFF-ROAD
    I’m having the exact same problem, for some reason I can’t find any else that has the same problem as mine until now, I’m just going nuts since I can’t figure the problem but what you do mean by bad gas, I was looking at some forums about someone saying bad gas. So I’m curious on what you mean by bad gas?
     
    Tundra2 likes this.
  3. May 11, 2020 at 5:52 AM
    #3
    JAM Auto

    JAM Auto [OP] New Member

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    I saw a thread where a guy had similar symptoms. He ended up taking it to a Toyota dealer & they found that he had bad gas (maybe old or it had water in it). I drained some gas out of mine & it smelled old. I drained out about 1/2 of what was in the tank. I unhooked both battery cables, touched them together & let it sit overnight. Installed new Denso K20RU spark plugs even though the NGK BKR6EYA plugs that I had in it only had around 20k on them. Now truck runs great. Test drove with Snap-on Solus scanner & everything looks good, no codes - no misfires. I'm going to drive it on the highway & road test it more, but running well now.
     
  4. May 11, 2020 at 3:44 PM
    #4
    Professional Hand Model

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

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    ‘Somewhere’... a State of Mind
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    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    How did your gas go bad? Or, did you get bad gas from the station?
     
  5. May 11, 2020 at 5:53 PM
    #5
    JAM Auto

    JAM Auto [OP] New Member

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    Gas from a gas station
     
  6. May 11, 2020 at 6:52 PM
    #6
    ThundaTundra

    ThundaTundra New Member

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    I had the same issue with mine, went nuts, thought I heard it in the booster, but couldnt change the sound, so was gonna make a cigar box to smoke it, when for the hell of it I got ambitious again and decided to play find the leak, when I was about to give up, I put my fingers in the little gully under the master, heard the sound change, Bingo! Little putty buddy and back to making money. No more lean cylinder 1 and misfire good bye, it was instant. Good luck hope you find the issue
     

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