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sisters 4runner having running issues - please read

Discussion in '1st Gen. Tacomas (1995-2004)' started by vantaco, Mar 17, 2011.

  1. Mar 17, 2011 at 7:52 AM
    #1
    vantaco

    vantaco [OP] Well-Known Member

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    so my sister called me this morning and told me to listen to her 3.6L 4runner which was running rough and much louder than normal

    she drove it home the night before perfectly fine

    it was idling around 1500 rpm

    told her to drive it around the block, she did and it was way way down on power, almost couldn't get it home

    where would you start in diagnosing this?

    the plugs are new in the last year so it's not them, possible coil pack problem?

    any ideas would be great

    thanks guys

    UPDATE: loud "exhaust" noise is from the engine bay, not from the back of the truck
     
  2. Mar 17, 2011 at 8:05 AM
    #2
    facemob

    facemob Well-Known Member

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    possibly a compression / firing issue. 1 or more cylinders not hitting correctly.
     
  3. Mar 17, 2011 at 8:09 AM
    #3
    vantaco

    vantaco [OP] Well-Known Member

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    ya i figured one cylinder might be out.....but why would it be sounding louder than normal?
     
  4. Mar 17, 2011 at 8:14 AM
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    BFA

    BFA Nuttier than squirrel shit.

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    sounding louder as in just idling higher as you stated at 1500?
     
  5. Mar 17, 2011 at 8:20 AM
    #5
    97yota4wd

    97yota4wd Well-Known Member

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    i dont know much.. but this is the first thing that popped into my head, maybe the timing belt/chain streatched causing your timing to be a wee bit off?
     
  6. Mar 17, 2011 at 8:39 AM
    #6
    hillbillynwv

    hillbillynwv Well-Known Member

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    Fuel filter plugged, fuel pump is going bad, one of the coil packs bad, there are three of them on the passenger side valve cover. Could be any of those or something else.
     
  7. Mar 17, 2011 at 8:52 AM
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    vantaco

    vantaco [OP] Well-Known Member

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    ya not engine sound but exhaust sound



    i was wondering if it might be a fuel problem (that would account for possibly rough idle and low power....but the "loud" exhaust doesn't seem to make sense

    again, this was all at 6am, i was half asleep and she was panicked....so i'll take a look at it on saturday to see if the exhaust really is louder or what might be up

    i'd assume the fuel filter has never been changed (although they are life time...and i changed mine on my tacoma), i'd change it but that's money she doesn't have

    how can i test the coil packs?

    how can i test the fuel pump? where can i disconnect it from and test flow?

    i'd like to start by testing the coil packs and fuel pump and go from there

    thanks guys
     
  8. Mar 17, 2011 at 9:03 AM
    #8
    jammdogg

    jammdogg Well-Known Member

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    I had a similar issue on my 99 4runner. It started happening after I installed a K&N Filter. Apparently, it had too much oil on it, and it clogged the Airflow sensor. It ran really rough, and coughed and spit until it was cleaned. It continued happening until I put a factory air filter back in.
     
  9. Mar 17, 2011 at 9:08 AM
    #9
    mjp2

    mjp2 Living vicariously though myself Moderator

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    Any codes being thrown? CEL on?
     
  10. Mar 17, 2011 at 9:09 AM
    #10
    vantaco

    vantaco [OP] Well-Known Member

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    she's got a brand new oem filter in there

    so i just talked to her again, apparently the "loud" exhaust sound is coming from the engine bay, not the back of the truck

    so i'm hoping it's a loose spark plug (over night?)

    or what else could have gone over night....head gasket? i sure hope not but anything else?
     
  11. Mar 17, 2011 at 9:14 AM
    #11
    vantaco

    vantaco [OP] Well-Known Member

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    no CEL either apparently
     
  12. Mar 18, 2011 at 8:34 AM
    #12
    vantaco

    vantaco [OP] Well-Known Member

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    ok so i went and look a look at the truck, within 2 seconds i knew what it was...looked under the truck and confirmed. some asshole cut off the cat

    so that's getting taken car of today

    thanks for the help guys
     
  13. Mar 18, 2011 at 8:52 AM
    #13
    mjp2

    mjp2 Living vicariously though myself Moderator

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    Ugh. Sucks, but at least it's a relatively quick fix.

    Insurance claim for theft or paying out of pocket?
     
  14. Mar 18, 2011 at 8:53 AM
    #14
    vantaco

    vantaco [OP] Well-Known Member

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    not sure...cheap fix is like $150-$200 at a mufler shop

    insurance would be $300 but then she get's all new exhaust pieces that were damaged

    she's checking with insurance to see how much they'll cover
     
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