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HELP: Misfire after plug change

Discussion in '1st Gen. Tacomas (1995-2004)' started by Taco.VR4, Nov 11, 2011.

  1. Nov 11, 2011 at 8:33 AM
    #1
    Taco.VR4

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    Taco.VR4 [OP] Fast Cars, Off-Road Trucks, and Hott Women ;)

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    I replaced the spark plugs recently. Had autolites in it, so I replaced with the proper Denso duel-electrode style plugs. I gaped them at 0.40. I also disconnected the negative side of the battery. Started getting misfire while idling @800rpms.

    I took the plugs back out and re-gaped them to ensure they were within spec but no luck.

    On a good note, no negative signs on the plugs (lean/rich/fouling)... but thats only after ~500 miles.

    Ideas??? :confused:
     
    Taco.VR4, Nov 11, 2011
    #1
  2. Nov 11, 2011 at 8:34 AM
    #2
    macgyver

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    macgyver Well-Known Member

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    Did you forget to plug the harness back in to one of the coils by chance?
     
    macgyver, Nov 11, 2011
    #2
  3. Nov 11, 2011 at 8:44 AM
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    Taco.VR4

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    Taco.VR4 [OP] Fast Cars, Off-Road Trucks, and Hott Women ;)

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    I doubt it but I will doubt-check. So far any other RPM is not affected, only at idle.
     
    Taco.VR4, Nov 11, 2011
    #3
  4. Nov 11, 2011 at 11:23 AM
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    thatSchusterguy

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    thatSchusterguy Well-Known Member

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    I'm having a similar issue, except mine is only when it's a cold start...
     
    thatSchusterguy, Nov 11, 2011
    #4
  5. Nov 11, 2011 at 11:30 AM
    #5
    hayabusa3303

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    hayabusa3303 Well-Known Member

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    Check your wires?? sounds like you have something going to ground like a arc. .
     
    hayabusa3303, Nov 11, 2011
    #5
  6. Nov 11, 2011 at 11:38 AM
    #6
    4x4Runner

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    4x4Runner Sam’s gone, man. Moderator

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    I would check the plug wires on the drivers side. There might be one that isn't seated well on the plug or the plug wire itself has issues. I had something similar early this year. I changed the plugs and noticed a misfire, pulled the plug wires and tested the resistance and found one that was 4x the specified resistance, if I bent the wire trying to get the Fluke probe into it I noticed that I had an open. There was enough voltage to bridge the gap in the open wire and in doing so there wasn't enough voltage to create a spark on the plug.
     
    4x4Runner, Nov 11, 2011
    #6
  7. Nov 11, 2011 at 12:57 PM
    #7
    4WD

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    4WD cRaZy oLdmAn

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    Could be a bad wire, & the plugs are pre-gapped , usually if electrical the miss will be the same thru out RPM range & won't matter if its been running or just starting up cold, if its electrical a misfire will be there right from the startup...;)
     
    4WD, Nov 11, 2011
    #7

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