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Fluctuating Idle

Discussion in '1st Gen. Tacomas (1995-2004)' started by texastaco81, Jun 27, 2011.

  1. Jun 27, 2011 at 11:16 AM
    #1
    texastaco81

    texastaco81 [OP] Active Member

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    Jim
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    Hi Guys,

    I recently bought my first used Tacoma a few weeks back. First post for me, but looks like lots of real helpful people on this forum!

    Anyhow,

    Truck is 97k miles old, I had the shop replace the timing belt, front rotors, and add more coolant. I notice that when I am in drive, but stopped at a light the RPMs tend to *sometimes* fluctuate between 500 - 750 RPMS. It doesn't happen all the time, its very hot here in texas, and I am running the AC.

    Is this type of fluctuating normal? Should I take it back into the shop to get the issue resolved? Thanks in advanced everyone.
     
  2. Jun 27, 2011 at 11:28 AM
    #2
    BFA

    BFA Nuttier than squirrel shit.

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    Brian
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    turn off the ac and it wont do that. the compressor kicks in and the engine compensates by raising the rpm a bit or something like that?
     
  3. Jun 27, 2011 at 11:37 AM
    #3
    malander

    malander That's some tight butthole

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    Yeah that's completely normal. Your a/c unit uses electricity that comes from your battery which is charged by your alternator so it's just the engine running the alternator a bit harder to compensate for the power draw.
     
  4. Jun 27, 2011 at 11:43 AM
    #4
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    I believe you are correct. 250 RPM fluctuation to compensate for the A/C compressor is nothing to be concerned about, perfectly normal.
     
  5. Jun 27, 2011 at 11:53 AM
    #5
    texastaco81

    texastaco81 [OP] Active Member

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    Is it normal to sit around 500 - 750? Would normal be more like 0 - 250? My knowledge of RPMs is pretty bad. I appreciate all this help!
     
  6. Jun 27, 2011 at 11:55 AM
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    BFA

    BFA Nuttier than squirrel shit.

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    0 means your engine isnt running. your idle shoule be around 5-800ish
     
  7. Jun 27, 2011 at 11:55 AM
    #7
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    0 means the engine is not running. 500 - 750 is fine at idle, 250 would be too low and would probably start spuddering. RPM is Revolutions per Minute, 0 revs means the engine isn't turning.
     
  8. Jun 28, 2011 at 3:18 AM
    #8
    Tacito

    Tacito Member

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    try changing the fuel filter
     
  9. Jun 28, 2011 at 5:09 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    The draw is from turning the A/C compressor, not charging the battery.
     
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