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Tapping/knocking

Discussion in '4 Cylinder' started by Rebelgone, Jul 27, 2010.

  1. Jul 27, 2010 at 12:02 PM
    #1
    Rebelgone

    Rebelgone [OP] Member

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    I have a 02 2.7 4x4 taco. When I am running down the road at say 60 mph the motor will start tapping/knocking. If I give gas or let go of the gas it will go away. One time when it did it. It blow smoke out of the back. Let off the gas and it stop. Most of the time it will only do it when I have beening the same speed for 20 mins or so, but when it starts to do it. It will not stop until the motor cools down. Any ideas?
     
  2. Jul 27, 2010 at 12:17 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    What color is the smoke?
     
  3. Jul 27, 2010 at 12:19 PM
    #3
    Rebelgone

    Rebelgone [OP] Member

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  4. Jul 27, 2010 at 12:21 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
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    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    Could be a blown head gasket, bad valve seals, stretched chain (not very common), bad plugs.

    When was the last time you change the plugs?

    Has it over-heated lately?
     
  5. Jul 27, 2010 at 12:37 PM
    #5
    Rebelgone

    Rebelgone [OP] Member

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    It has never overheated. I changed the plugs and pcv value this past Saturday.It only seems to do it when I have been running the same speed for awhile(above 2000 rpm). It has only blowen the smoke out the back one time.
     
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