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Intermittent Single Cylinder Misfire

Discussion in 'Performance and Tuning' started by Brunes, May 24, 2013.

  1. May 24, 2013 at 5:42 AM
    #1
    Brunes

    Brunes [OP] abides. Staff Member

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    Wifeies 4R (1GR-FE) started rough the other day, Ultragauge threw a pending 0306 (Cyl #6 Misfire), then threw the CEL later in the day. Cleared all and it seemed fine, then started a bit rough this morning.
    Wife also swears she heard a mouse in the dash, but nothing else has failed.

    Little shy of needing plugs (26k) but I'm gunna do those, TB and MAF cleaning, and some fuel system cleaner.

    Any other ideas?
     
  2. May 24, 2013 at 5:47 AM
    #2
    Torspd

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    Mouse in the dash huh? There was a guy once who started havinh all sorts of problems. Ended up pulling his radio, I think radio, and looking at the harness. Chewed and mangled wires everywhere. I hope for you guys sake, that it wasn't a mouse or rat.

    What year T4R?
     
  3. May 24, 2013 at 5:50 AM
    #3
    Brunes

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    2004. It acted about like this when I bought it, and calmed right down w/ a good engine groom, so I'm gunna try it again. If that fixes it-Then my concern is why the engine is eating plugs so fast.
    We'll see about the mouse thing...I took the dash about 1/2 apart and can't find any of the telltale signs...
     
  4. May 24, 2013 at 5:53 AM
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    Torspd

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    How many miles are on it?

    Have you ever replaced the fuel filter/pump?

    Have you checked for vacuum leaks yet?
     
  5. May 24, 2013 at 5:55 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Vacuum leak, I agree. Pump/Filter.....That would create more miss fires other than only on 2 cylinders. And at 26k miles, the assembly should be fine.
     
  6. May 24, 2013 at 5:57 AM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    I would start with checking the spark plug connections, then the fuel injector connections, while also looking for vacuum leaks.
     
  7. May 24, 2013 at 5:59 AM
    #7
    Brunes

    Brunes [OP] abides. Staff Member

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    Total mileage is 140k...It's 26k since I bought it and dropped in new plugs.
    Would a vacuum leak affect only one cylinder?? ( Never troubleshot one before...)
     
  8. May 24, 2013 at 6:10 AM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Not that I know of. Most times, a leak creates a "roaming" miss fire. If the mis is only on the 1 cylinder, it could be an injector. That's the most common cause for a single cyl. miss.
     
  9. May 24, 2013 at 6:12 AM
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    BlazeTaco

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    Well if your wife's 4 runner is similar to the tacoma's control scheme all of you computer controls are up under the dash on the passenger side. And if you really do have some mice in it I would check for exposed wires especially for cylinder 6 injector and ignition coil. Pull the number 6 coil and make sure the tip of the plug is not black or corroded and the same with the coil connections and tip for the spark plug. Another possibility is that you have a burnt valve, but it is probably the less likely situation.
     
  10. May 24, 2013 at 6:20 AM
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    Torspd

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    140k and no fuel filter change?

    Like Chriss mentioned, if it is one cylinder, then it likely won't be long before it is multiple cylinders, due to clogged injectors. They should be serviced. A good injector cleaner might help, but it won't do anything about the fuel filter.

    Also if she hasn't already, try a quality brand 91 or 93. Dependant on your area.

    I do know this, I had a repeat misfire cyl 1, on my Subi. Changed all sorts of stuff. 200k miles. Had vacuum leaks. Repaired. Still did it, until I changed the pump. That however will show its signs of degradation, in the higher RPMs, as it cannot keep up with increased fuel demands.
     
    Last edited: May 24, 2013
  11. May 24, 2013 at 6:25 AM
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    Torspd

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    Oh. Check the PCV hose on the driver side. That would be the first place to look, after the vacuum hose on
    the intake which goes to the passenger valve cover.
     
  12. May 24, 2013 at 7:08 AM
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    Torspd

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    For point of reference, the service interval for the fuel filter is 30k miles. ;)
     
  13. May 24, 2013 at 10:41 AM
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    Brunes

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    Where did you find that?? I didn't come across anything regarding the fuel filter in the factory service interval pamphlet...

    Pulled all the plugs (photo to follow), cleaned MAF and TB, and did an oil change. I think there is some fouling on the injector as the #6 plug came out whiter than all the rest, therefore hotter than the rest.
    I'm going to be pulling the injectors out of my Tacoma in the near future to install high flow injectors for my TRD blower, so I'll probably put one of those into the 4R and see what happens w/ this set of plugs.

    Thanks for the ideas guys!!
     
  14. May 24, 2013 at 10:58 AM
    #14
    Brunes

    Brunes [OP] abides. Staff Member

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    ImageUploadedByTapatalk1369418259.635872.jpg
    Aligned in positions they came out of. #6 is the right rear plug-Extra white.
     
  15. May 24, 2013 at 11:00 AM
    #15
    Torspd

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    Depending on how long you are going to be until your new injectors, you could try just swapping that injector with another on her T4R.
     
  16. May 24, 2013 at 11:03 AM
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    Torspd

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    Which way is the front of the truck based off of those plugs? And which side is driver side?
     
  17. May 24, 2013 at 1:18 PM
    #17
    Brunes

    Brunes [OP] abides. Staff Member

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    It'll only be a couple weeks, max and I don,t want to do that work that many times over...so I'll let it ride unless e problem continues to manifest or gets worse.

    Bottom of the photo is the front of the engine so driver side is on the right.
    Top right plug is the #6 plug...
     
  18. May 24, 2013 at 2:32 PM
    #18
    Torspd

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    Sorry. I missed the location that you said when you posted the picture. Had to many things going on at once.

    A higher octane until the swap, and it should be fine. I will look and see if I can find that service interval.
     
  19. May 24, 2013 at 4:51 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Fuel filter is in the tank. Not user serviceable, and supposed to be a "ifetime filter.
     
  20. May 24, 2013 at 5:49 PM
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    tooter

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    Is it just me, or does the gap on the upper left plug look a lot wider than the rest?
     
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