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Cylinder #4 misfire!

Discussion in '1st Gen. Tacomas' started by MapleMoose, Oct 28, 2011.

  1. Oct 28, 2011 at 2:36 PM
    #1
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    So my truck started shuddering when i started it up after lunch. It was fine on the way to lunch but now its not firing right. I got up to speed and the Cel started flashing which means the cylinder isn't working at all. Crawled my way back to work and scanned it... P0304 code cylinder 4 misfire.

    Now i need to get home today and the shop won't be.able to look at it till next week. Can i drive it or do i.risk snapping a rod??
     
  2. Oct 28, 2011 at 3:30 PM
    #2
    RIO5.0

    RIO5.0 Active Member

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    Generally thats a fouled plug...grab a new plug and change it out. Its just gonna run like ass...I wouldnt think you'd snap a rod. If a plug dont cure it, it might be a coil??
    Plug is a 2.00 fix... youll be able to tell instantly if she's fixed.
     
  3. Oct 28, 2011 at 5:16 PM
    #3
    SCSPerformance

    SCSPerformance Stealth Custom Series™

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    my brother has a '02 4cyl. that developed the same symptoms. he keep on driving it while trying to diagnose the problems. the misfire would jump from cyl. 1 to 4 randomly and the engine shaking got worse over time.

    at the time the motor had like 245k miles so our last assumption was that it had a burnt valve. finally he had a mechanic friend look at it and he came to the same conclusion. at this point, instead of just replacing the valve, my brother decided to just rebuild the motor so the heads went off to the machine shop.

    it purrs like a kitten now and it seems to have more pep. hopefully, your situation isn't like his. you can start with replacing the plugs. swap the coils around and see if the misfiring moves to another cyl.
     
  4. Oct 28, 2011 at 5:17 PM
    #4
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    Changed plug 4 and it sounds better already.
     
  5. Oct 28, 2011 at 5:18 PM
    #5
    whippersnapper02

    whippersnapper02 Well-Known Member

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    posted via :sandwich:
     
  6. Oct 28, 2011 at 5:55 PM
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    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    Drove it and its still rough. Cel came back on and started flashing again. Code still reads cylinder 4 misfire... fuck!!!!
     
  7. Oct 28, 2011 at 9:15 PM
    #7
    TacoMX

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    stock.....for now...
    plug wires? did the plug look fouled when you replaced it?
     
  8. Oct 28, 2011 at 9:23 PM
    #8
    ICEMAN

    ICEMAN Well-Known Member

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    it is your ignition coil for that cylinder. i had this same problem replace the coil yourself and save alot of $$$
     
  9. Oct 28, 2011 at 9:47 PM
    #9
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    If it is misfires too long, you'll burn a valve and bend it.
    and lose compression

    old motor read like

    168-49-169-168
    :anonymous:



    Easy check is swap coilpacks around, clear code, drive it.
    Scan codes, if it jumps a cylinder, it's 100% a coilpack.

    Also, look into flowing your injectors..mine old 2RZ was missing because of coilpack plus also injectors weren't flowing correctly...there like $15-30 each to have them rebuilt with new baskets, o-rings and flowed.
     
  10. Oct 28, 2011 at 10:03 PM
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    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    Thanks guys. Anyone have a write up for replacing the coils?
     
  11. Oct 28, 2011 at 10:18 PM
    #11
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    unbolt, rebolt.
     
  12. Oct 28, 2011 at 10:44 PM
    #12
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    I've never done coils. Where are they
     
  13. Oct 28, 2011 at 11:01 PM
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    SCSPerformance

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    LOL, if you can do spark plugs, swapping coils is cake. it should looks similar to this pic. unplug the harness and swap 4 to 1 and 1 to 4. reset everything and drive it around and scan for codes when the light comes back on. if it misfires in cyl.1 then its the coil, but if it still misfires in cyl.4 then you can rule out the coil.

    [​IMG]
     
  14. Oct 29, 2011 at 2:03 PM
    #14
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    Ok, so when you say swap 4 to 1 and 1 to 4, you mean you take out the coil and put it in the other and vice versa? Also i thought 3 coils were on the left of the engine and 3 plugs were on the right of the engine?

    5 6
    3 4
    1 2
    Front

    So how do i swap 1 to 4 if #4 doesnt have a coil?? Or am i swapping the wires?
     
  15. Oct 29, 2011 at 3:07 PM
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    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    He was referring to a 4 cylinder, the 4 cylinders have coilpacks..1 coilpack runs 2 cylinders.

    You have individual coil's.
    Take 4 and put it where 3 is on opposite bank.
    Clear code, drive, when code pops back up..scan it..see if it says bank 1 cylinder 3 or whatever
     
  16. Oct 29, 2011 at 3:27 PM
    #16
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    So basically swap 3 and 4, but leave the plugs in?
     
  17. Oct 29, 2011 at 3:29 PM
    #17
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    yeah lol..your testing the coils..it has nothing to do with the plugs.
    Just make sure your plugs are gapped and within normal condition of plugs(not fouled, etc)
     
  18. Oct 29, 2011 at 3:46 PM
    #18
    millerm20

    millerm20 Member

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    if the light is flashing that means you could do harm to the catalytic converter from raw gas being feed to it
     
  19. Oct 29, 2011 at 3:51 PM
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    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    It's an 89 Toyota Pickup. I got some stuff done to it.. FJ axles going under it soon.
    True..but it will take ALOT..I drove on a misfire for a LONG time..because mine stumped me..I tried so many different things..then I finally checked compression and took valve cover off..and realized why.
    Mine still passed smog though after I fixed it.
    So it can ruin cat but it's gonna be dumping ALOT of fuel and for a long period of time.
     
  20. Oct 29, 2011 at 4:00 PM
    #20
    MapleMoose

    MapleMoose [OP] Drunk Canadian

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    Okay, so before i go ahead and start pulling things off and swapping them i need to be %100 clear of what im doing. Couple things dont quite make sense:

    1. If im swapping #3 coil into #4 hole and vice versa, how does it get power if the harness is unplugged?

    2. #4 plug gets power from #1 coil, so wouldnt it be easier if i just swapped #2 and #3 plugs?

    [​IMG]
    [​IMG]
     
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