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Weird Idle issues

Discussion in '4 Cylinder' started by Kirk1589, Dec 12, 2012.

  1. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Truck: 2003 Tacoma SR5 2.7 4x4 with 85k miles

    Issue: After cruising on the highway for 20 minutes or so, longer also when I come to a stop my idle fluctuates from 1200-2000 up and down then stays around 1250. If I cycle the key it will continue to do this also. Then around town I have had it dip down too 548 and almost stall before i recover the idle with a rev I get some fuel knock while doing this. What would cause this...I'm new to Toyota.

    [​IMG]

    Thanks for help Dave
     
  2. Kirk1589

    Kirk1589 [OP] Well-Known Member

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  3. Junya808

    Junya808 Well-Known Member

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    Is the check engine light on?
     
  4. Kirk1589

    Kirk1589 [OP] Well-Known Member

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  5. 03TACO44

    03TACO44 Member

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    Valdosta, GA
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    Tinted Windows, A/T tires.
    My 2.4L did this one time. I cruise down the interstate for about 3 hours at 80MPH, then when I get off the interstate it would idle at 2-3000RPM's. After a few trips it quit doing it. Course this happened right after it sat for 2 years, only getting driven about 1,000 miles within that 2 years.
     
  6. Junya808

    Junya808 Well-Known Member

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    Try checking your vacuum lines.
     
  7. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Ill give them a good look over
     
  8. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    No leaks. All lines are intact. Even tried the propane trick.
     
  9. DGXR

    DGXR Well-Known Member

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    This idle problem just developed recently on a 2003 model? I'll bet something came loose... +1 on the vacuum line check. Look for cracks too, not just loose or missing connections. Also check for cracked or loose wires.

    Any service or repairs done recently?
     
  10. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Yes just recently but it's intermittent meaning it will happen today but may not tomorrow. Ill check for cracks and loose connections at the TPS and IAC. I hope the IAC isn't the cause because that sucker ain't cheap
     
  11. BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    Lift- stock suspension with light racing uppers,tc coil bucket gusset, timbern bumps ,defined extended shackles with shackle brace. Armor- custom tube bumper, kr fab rear bumper,trail gear wiy 78 in sliders Performance-intake manifold spacer, vibrant resonator Random stuff- kenwood head unit,b&m t shifter, hood bug deflector.
    X2 it's always something small that you can't find and it's a bitch
     
  12. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Yea I hope it's something small. I gonna look at it once this rain stops
     
  13. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Diagnosed it. Pretty obvious now. Idle dropped to 300 then it recovered about a few seconds later.threw a new OEM IAC in it PERFECT now
     
  14. Junya808

    Junya808 Well-Known Member

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    Good to hear you finally solved the problem.
     
  15. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Gosh dang it I lied its back
     
  16. Junya808

    Junya808 Well-Known Member

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    Try checking these also:
    Spark plugs and wires
    Air filter (also check your MAF sensor while your at it)
    Fuel filter
    Fuel injectors
     
  17. Kirk1589

    Kirk1589 [OP] Well-Known Member

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    Where is the fuel filter? Plugs have 3k on them. I cleaned MAF with MAF cleaner along with the throttle body.
     
  18. MMumau

    MMumau Active Member

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    Any residue on the plugs?
     
  19. Kirk1589

    Kirk1589 [OP] Well-Known Member

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  20. 1rooster

    1rooster TACOMA31750

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    This same thing happened to me back several years ago. i had a 2001 2.7 single cab. I ended up cleaning the throttle body good and and the maf and it fixed my problem. but it didnt seem to help you though! not sure what it would be
     
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