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Intermittent P0305 Cylinder 5 Misfire on 2014 Tundra

Discussion in 'General Tundra Discussion' started by Mtrax69, Oct 5, 2021.

  1. Oct 5, 2021 at 4:34 PM
    #1
    Mtrax69

    Mtrax69 [OP] New Member

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    Hi everyone, I've been having an issue with my 2014 Tundra Platinum 5.7L 104k for the past month. Long story long... I had the truck in for an oil change and engine air filter replacement, the next morning I drove it about 10 miles to work no problem, then started driving home that evening and it began shaking within 100 yards and the check engine light started flashing. I took it to Napa and it was the p0305 code. I bought 8 new NGK iridium plugs and swapped them out the next day, and also swapped the 5th and 3rd ignition coils (just to rule that out). The truck ran fine the next few days and then started shaking again after about 1/2 a mile of driving in the winding Mountain Roads here in Colorado. I pulled over, popped the hood and looked around. When I restarted it it no longer had a check engine light flashing. I carefully drove it to my mechanic, they scanned it and showed it was the same code. I brought it to them about a week later when it started shaking once again and throwing the check engine light, they hooked it up while it was still shaking and we could clearly see the fifth cylinder was in fact misfiring on the live data readout. Of course, then it quit doing it once we tried to drive it. I brought it back to them again a few days later when it started having the same issue, this time the mechanic listened with the stethoscope and heard that the fifth cylinder fuel injector was not making the correct sound, so they replaced the injector with a new Denso one. It ran fine for another 3 days and threw the same code again. I brought it back to them and they tried for three days to diagnose it, and were actually able to replicate the issue a couple times. They also drained the oil and filled it back up with 0-20 full synthetic again and put some seafoam in it. When the mechanic started it up it misfired right away, but then he was not able to get it to misfire afterwards. The next day I even replaced the ignition coil connector plug with a brand new one. It ran fine for another 2 days, and then this morning AGAIN popped the P0305 code after about 1/2 a mile of driving from my house. Sorry to be so long-winded, but I have spoken to several mechanics and even a Toyota service technician, and they are all stumped. At this point I am thinking it might be something to do with an intermittently loose connection where the ignition coil wires or possibly the fuel injector wires attach to the ECM. I am hoping somebody has seen a similar issue and can shed some light for me! Thanks
     
  2. Oct 5, 2021 at 5:23 PM
    #2
    Tundra14Platinum

    Tundra14Platinum I love reading the CoC in my spare time

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    2014 Platinum CM Sky Silver
    TRD PRO Grill/Headlights, Swaybar, Eibach
  3. Sep 17, 2022 at 10:32 AM
    #3
    Sadie380se

    Sadie380se New Member

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    Did the problem ever get fixed ?
    I’m having the exact same problem, same everything
     
  4. Sep 22, 2022 at 4:17 PM
    #4
    Kappaisa

    Kappaisa New Member

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    You ever figure this out mtrax?
     

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