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P0305 and limited patience remaining

Discussion in '4th Gen 4Runners (2003-2009)' started by Stormyweather, Mar 16, 2023.

  1. Mar 16, 2023 at 3:30 PM
    #1
    Stormyweather

    Stormyweather [OP] New Member

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    Alright, I am nearing my limit of staying calm and collected. Figured I could find some good ideas on here from you geniuses haha
    Recently bought 05 runner with 179k sr5 v6 1grfe 2WD. Good condition, garage kept. Slight oil leak on passenger valve cover towards front. Three weeks after engine light turns on (P0305 cyl5 misfire) as well as VSC TRAC light. The trend for the code is: the first drive of the day, 30 or so miles, totally fine, after around an Hour or longer start it up and immediately will get the vibrations and the feel of the misfire and the code pops. Read all the forums and diagnostics I could find. Here’s what I’ve done:
    1. Replaced all plugs NGK (light back on)
    2. Swapped coil 5 to coil 3 (light back on)
    3. Replaced injectors motor west reconditioned and the intake plenum gasket and TB gasket (side note the ones I took out were not OEM, some junkers Chinese unrecognizable brand) (light came back)
    4. Compression check: cylinder1- 158psi, 2 - 161, 3- 155, 4 - 159, 5 - 155, 6-159
    5. Noticed a crack in the intake hose connected to the valve cover on passenger side for cylinders 1,3,5 and taped it temporarily and at the same time I put a brand new denso coil on 5. Code was off for 3 full days. Came back on yesterday :(
    I did notice some chewed wires I’ll upload a pic.

    any ideas ?
     
  2. Mar 16, 2023 at 3:31 PM
    #2
    Stormyweather

    Stormyweather [OP] New Member

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  3. Mar 18, 2023 at 1:23 PM
    #3
    negusm

    negusm New Member

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    Check for a head gasket leak to rule that out.

    Also post pictures of the plugs and which cylinder they were in.
     
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  4. Mar 18, 2023 at 2:32 PM
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    AuSeeker

    AuSeeker New Member

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    Your 4Runner is in the year models that had head gaskets go bad so as suggested check for head gasket leak, using a kit check for exhaust gases in the coolant, check cylinder 5 with a borescope for coolant on top of the piston when it's cold after sitting all night.

    I would also do some more checking to see if there's any more wires chewed causing a short, hopefully you have separated the wires in the photo and at least wrapped each of them with electrical tape.
     
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  5. Mar 18, 2023 at 8:52 PM
    #5
    Stormyweather

    Stormyweather [OP] New Member

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    5F903BC9-5814-40A1-A879-8C00280882C2.jpg I separated the wires and wrapped each individually because they didn’t appear to be damaged. I also went ahead and replaced the exhaust manifold gasket.

    plugs from each cylinder goes from 1 on top to 6 on bottom
     
  6. Mar 18, 2023 at 8:54 PM
    #6
    Stormyweather

    Stormyweather [OP] New Member

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    Here’s a pic of the intake when I replaced the injectors. 6 looked a bit extra clean

    A0E625ED-AC17-4D12-A38E-AC50C4A9D738.jpg
     
  7. Mar 19, 2023 at 9:18 AM
    #7
    Stormyweather

    Stormyweather [OP] New Member

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    I ordered a borescope off Amazon so I’ll post pics when I get that sometime this week. Also I drove about 200 miles yesterday after the exhaust gasket replacement, 100 miles to a restaurant it sat for about 2 hours, code did not pop up, and back home. This morning I ran it and no code but I plugged in scanner and there was a p0305 pending. The coolant is at the max line and after it warms up is around the exact middle so I’m not noticing any loss unless it’s really small that’s leaking into cyl5 ?
     
  8. Mar 19, 2023 at 5:45 PM
    #8
    negusm

    negusm New Member

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    Yeah you need to test your coolant. Your #5 is definitely having an issue. Rule out the head gasket.
     
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  9. Mar 19, 2023 at 5:49 PM
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    Stormyweather

    Stormyweather [OP] New Member

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    alright I’ll grab a test kit from oreillys. I do have zero bubbles coming out the radiator
     
  10. Mar 19, 2023 at 5:52 PM
    #10
    negusm

    negusm New Member

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    Next would be to trace down everything to do with #5. The wiring from the plug to the coil. Wiring from the injector to the ECU, etc.
     
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  11. Mar 19, 2023 at 7:07 PM
    #11
    GrantA

    GrantA Enjoying God’s creation

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    I second this. You seem to have a bit extra oil residue on cylinder 5. The ceramic top is darker than the rest and the thread on the plug seems like it is caked in oil. As mentioned test the coolant because you can’t always tell from looks and see what the TSB recommends doing. Hoping you get back up and running soon.
     
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  12. Mar 19, 2023 at 7:23 PM
    #12
    Stormyweather

    Stormyweather [OP] New Member

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    I tested the wire harness on coil and injector to ECU and they both had continuity, I think the ohms number was .403 ? They were right next to each other on the ECU connector that was a few days ago and I forgot to say so here. I’m starting to forget all I’ve done because it feels like quite a lot.
    Also the wires that were slightly chewed went to two items on the driver side for cyl 2,4,6. One was the VVT solenoid and the other was what looked like an oil temp sensor
     
  13. Mar 19, 2023 at 7:33 PM
    #13
    Stormyweather

    Stormyweather [OP] New Member

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    This is an NGK plug that was put in march 3rd and took out march 10th a week of being in cyl5 the others were perfectly clean still

    B22D40ED-DC57-4A1B-9FB6-F782701B9721.jpg
     
  14. Mar 20, 2023 at 4:32 PM
    #14
    Stormyweather

    Stormyweather [OP] New Member

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    Alright I hooked this bad boy up: results….blue stayed blue I left it on for approximately 10 minutes and no color change 1E955553-AE64-49EA-90B3-497327403EBB.jpg

    90A33081-B7BD-42B0-957B-EA6F95D0D0AE.jpg
     
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  15. Mar 20, 2023 at 4:47 PM
    #15
    Brownspotz

    Brownspotz High Class Hyena

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    Had same problem with a 2006 4.0. Ptcm had a failing coil driver for #5. Did all the same steps you did.
     
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  16. Mar 20, 2023 at 5:12 PM
    #16
    SR5 Limited

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    I know a guy that had this happen to his Bronco. Just leave the plug out, unhook injector, and rock that baby another hundred thousand miles?
     
  17. Mar 20, 2023 at 5:16 PM
    #17
    Stormyweather

    Stormyweather [OP] New Member

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    I’ll look that up, thank you! Frustrating eh?
     
  18. Mar 20, 2023 at 6:40 PM
    #18
    xtremewlr

    xtremewlr New Member

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    Lots with more in the works
    PTCM? Or do you mean the ECU? The TCM is for the transmission and likely isn't the issue here. The ECU is the likely culprit tho.

    @Stormyweather, I would do an ebay search for a 2005 V6 ECU that matches the ECU number on yours. The ECU is located under the dash, behind the glove box.

    I'm seeing them on ebay for $110 shipped from UAE. Might be the ticket to fixing your issues, might not.
     
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  19. Mar 20, 2023 at 7:18 PM
    #19
    Stormyweather

    Stormyweather [OP] New Member

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    That’s exactly what I did but later saw something about the ECU having to be programmed to the vehicle’s specific VIN? I am pretty good at finding issues with electronics maybe I can look inside the unit and see if anything looks amiss. Do these 4Runners ever get misfires from a bad ECU? Just seems so unlikely and/or rare.

    Also, I did hook up an XTool diagnostics computer and it ran a full scan of like 150 tests including the ECU and everything passed except the TPMS. And also, if the ECU was bad wouldn’t I be getting a handful of other problems? I’m just throwing my thoughts out there, I feel I’ve done just about everything haha
     
    Last edited: Mar 20, 2023
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  20. Mar 20, 2023 at 7:25 PM
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    xtremewlr

    xtremewlr New Member

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    Yeah, you will need to have the VIN programmed to the replacement ECU. There are places that can do that and you can usually buy ECUs from them. I think they even sell on ebay. Prices might be higher tho. Dealership can reprogram too but they might balk at doing it to an ECU that they didn't provide. You'd have to check.

    ECU problems are rare but do happen.
     
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  21. Mar 20, 2023 at 7:33 PM
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    Brownspotz

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    Ptcm=powertrain control module ecu is a generic term for an electric control module tcm is trans control module. I should've cleared that up . Too many years of working in a shop, terms have changed for specifics. Either way that was the culprit, sent it out repaired, reflashed and updated too.
     
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  22. Mar 20, 2023 at 7:33 PM
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    Stormyweather

    Stormyweather [OP] New Member

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    Before I do that, if the light comes back on (so far it hasn’t since Saturday morning when I cleared a pending one) should I replace the intake manifold gasket?
     
  23. Mar 20, 2023 at 7:35 PM
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    xtremewlr

    xtremewlr New Member

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    You pulled the upper part of the intake, not much more work for the lower part. I'd replace all those gaskets if even for piece of mind that they are for sure good.
     
  24. Mar 20, 2023 at 7:41 PM
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    Stormyweather

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  25. Mar 20, 2023 at 7:46 PM
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    Stormyweather

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    Did you have other problems with your rig because of the bad unit? Or did it only cause a misfire. Was your misfire in only 1 cylinder? Was it only happening like once on idle? Sorry I’m just trying to get my mind wrapped around this situation
     
  26. Mar 20, 2023 at 8:09 PM
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    xtremewlr

    xtremewlr New Member

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  27. Mar 23, 2023 at 8:25 PM
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    Stormyweather

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    Just like to post an update. The last fix I did that so far hasn’t popped a code was that exhaust gasket +new o2 sensor… just crazy if it was that gasket after all the previous work I did ha
     
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