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High Idle

Discussion in '1st Gen. Tacomas (1995-2004)' started by atapia22, Aug 16, 2011.

  1. Aug 16, 2011 at 11:58 PM
    #1
    atapia22

    atapia22 [OP] Well-Known Member

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    I have a 3.4 V6 tacoma its idle on normal warm temp is 1500rpm, when it usually was lower then 1k. i had it parked for almost 2 weeks and thats how it started doing it when it was normal temp. i would appreciate it if u guys help me, thank you. :D
     
  2. Aug 17, 2011 at 1:01 AM
    #2
    SCSPerformance

    SCSPerformance Stealth Custom Series™ Vendor

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    take out you iac and clean it thoroughly. check for vacuum leaks as well.
     
  3. Aug 17, 2011 at 1:03 AM
    #3
    hayabusa3303

    hayabusa3303 Well-Known Member

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    Three things to try first one dont laugh. im going to assume you have no check engine light on.

    One take the post.and neg. terms. off the battery and JOIN them for 20 seconds. That drains the cap in the ECM for a fresh start. lost of flash memory see lesson. :)

    Second with the engine running that HIGH of a rpm sounds like cam shaft sensor is out or there might be a problem. ( it will not throw codes at you on the ecm trust me ) That is one thing toyota ecms dont do every good is catching stuff when a sensor is going bad.

    Third bottom of your throttle body you have a IAC valve. That could be dirty(carbon) or going bad. This controls the idle on your engine. Get a manual and check the unit with a ohm meter confirm its in spec.


    One more check your TPS on your throttle body make sure you dont have that going bad also. ( HINT mine was doing the same thing this was the problem) ( no codes from the ecm where ever threw at me for a month)

    Lesson : the 5vz-fe ecm uses a chart to go by when you reset the ecm. The computer must LEARN the engine all over again it can take it from a day to 3 days depends on your driving. You will see is slowly start to idle it down if everything is ok. Ecm uses the chart to know how the engine is responding to that input. Yours starts at 1500 thats a southern truck mine starts at 2250 to 2500 on starts up ( mine is a cold weather truck). When mine relearned the engine it took about a day and it was idling at 700 rpms . If it doesnt idle down your problem i bet is in one of four spots.

    If anyone is wandering how i have so much on this engine i found a USSR website that had a break down of this ecm and what everything did. :D

    let me know if i can help you more. willing to help.
     
  4. Aug 17, 2011 at 1:05 AM
    #4
    Blackdawg

    Blackdawg Dr. Frankenstein

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    hell mine idles at 2k everytime i start it...till it gets warm..
     
  5. Aug 17, 2011 at 11:10 AM
    #5
    MacGyvR

    MacGyvR Well-Known Member

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    Crossing terminals sounds like a bad idea.

    Everything else sounds right though. I had a high idle a month or so back, so I unplugged the battery for about half an hour and reconnected it. That, in combination with cleaning the MAF and throttle body plate brought my idle down from 1500rpm to 1100 on start up. At stop lights i'm between 500 and 800.
     
  6. Aug 17, 2011 at 11:40 AM
    #6
    atapia22

    atapia22 [OP] Well-Known Member

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    thank you very much, it helped just doing the simple thing, disconnecting the battery for a few seconds than back to normal, thank you:D
     
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