1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

97 idle fluctuation

Discussion in '1st Gen. Tacomas' started by trucruiser, May 18, 2012.

  1. May 18, 2012 at 8:58 AM
    #1
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    So.... I have been working on ressurecting a 97 tacoma with a 3RZ. It has 93k on the ticker. This truck was parked on the wrong side of town and suffered a bullet through the intake plenum and valve cover as well as the wire harness, which melted at the impact point. To this point I have replaced the harness, valve cover, intake and some relays. I can now get the truck to start and run but my main problem right now is the idle fluctuates high to low to high in a continuous cycle. temp does not effect the idle issue, It does it when its cool and warm. The little valve that pushes controls the throtle pushes it in and out. I have checked all the hoses and cleaned the TB but it doesnt help. The coolant is topped off, it has new oil and filter, cap and rotor. I also checked the TPs which seems to be working fine.
    What do you think I should try troubleshooting next?
    Any help is appreciated. Thanks
     
  2. May 18, 2012 at 9:12 AM
    #2
    Stubbs95tacoma

    Stubbs95tacoma Well-Known Member

    Joined:
    Dec 12, 2010
    Member:
    #47604
    Messages:
    3,302
    Gender:
    Male
    First Name:
    Blake
    Wichita
    Vehicle:
    07 SR5
    6 Inch Lift
    Someone shot your taco??? Wtf
     
  3. May 18, 2012 at 9:32 AM
    #3
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    I inherited it that way LOL, I do feel good about the progress though.
     
  4. May 18, 2012 at 9:37 AM
    #4
    Stubbs95tacoma

    Stubbs95tacoma Well-Known Member

    Joined:
    Dec 12, 2010
    Member:
    #47604
    Messages:
    3,302
    Gender:
    Male
    First Name:
    Blake
    Wichita
    Vehicle:
    07 SR5
    6 Inch Lift
    Poor taco :( try sea foaming it? Check for shit in the gas tank? MAF sensor
     
  5. May 18, 2012 at 10:08 AM
    #5
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    will try seafoam tonight.
    Thanks
     
  6. May 18, 2012 at 10:09 AM
    #6
    Stubbs95tacoma

    Stubbs95tacoma Well-Known Member

    Joined:
    Dec 12, 2010
    Member:
    #47604
    Messages:
    3,302
    Gender:
    Male
    First Name:
    Blake
    Wichita
    Vehicle:
    07 SR5
    6 Inch Lift
    Anytime! I think there is a sticky on it
     
  7. May 18, 2012 at 3:55 PM
    #7
    dentaco76247

    dentaco76247 Registered Mud Abuser

    Joined:
    Mar 23, 2012
    Member:
    #75467
    Messages:
    108
    Gender:
    Male
    First Name:
    Greg
    Justin, TX
    Vehicle:
    97 Tacoma xtra cab 4x4
    4Runner bucket seats, Upgraded headlights Blistein 5100s Blacked out Grille
    O2 sensors could be adjusting the lean/rich mix... Just a thought I would seafoam it first. Replace fuel filter as well
     
  8. May 18, 2012 at 3:57 PM
    #8
    TacoMX

    TacoMX TW's Official anti body-lift pundit

    Joined:
    Aug 24, 2011
    Member:
    #62240
    Messages:
    4,834
    Gender:
    Male
    First Name:
    Jonathan
    Deltona, Florida
    Vehicle:
    '13 Tacoma TRD Sport DCLB 4x4
    stock.....for now...
    I could be missing something..but you said that it fluctuates between high and low idle..but that is normal.

    Low idle is ~750 and high idle is ~1100.

    Unless it does it in rapid succession.

    Need more details.
     
  9. May 18, 2012 at 4:10 PM
    #9
    dentaco76247

    dentaco76247 Registered Mud Abuser

    Joined:
    Mar 23, 2012
    Member:
    #75467
    Messages:
    108
    Gender:
    Male
    First Name:
    Greg
    Justin, TX
    Vehicle:
    97 Tacoma xtra cab 4x4
    4Runner bucket seats, Upgraded headlights Blistein 5100s Blacked out Grille
    The OP stated his idle fluctuates up and down while cool and warm. That is not normal. It should idle at about 1100 until warm then drop to 750ish.


    I recently helped a friend get an old Ford running that had sat parked in a field for four years. We had to replace fuel tanks, pumps, filters, spark plugs, wires, dist, and cap. It was a nightmare but ran like a champ when we got it done.
     
  10. May 18, 2012 at 4:13 PM
    #10
    TacoMX

    TacoMX TW's Official anti body-lift pundit

    Joined:
    Aug 24, 2011
    Member:
    #62240
    Messages:
    4,834
    Gender:
    Male
    First Name:
    Jonathan
    Deltona, Florida
    Vehicle:
    '13 Tacoma TRD Sport DCLB 4x4
    stock.....for now...
    Mine has always fluctuated between high and low idle when at operating temp. It runs fine... :notsure:
     
  11. May 18, 2012 at 4:13 PM
    #11
    TACOMABOSS

    TACOMABOSS Well-Known Member

    Joined:
    Jul 7, 2011
    Member:
    #59499
    Messages:
    4,311
    Gender:
    Male
    Vehicle:
    96 SR5 4x4
    Bilstein 5100s, Toytec AAL, Deck plate mod, Hella 500ff's, Sportsman Camo seat covers, Total Chaos 1" diff drop, JVC stereo, Painted bumpers and grille, Custom grille insert, HID projectors, Black spray paint
    I think he means in rapid succession. ive heard of that before.. its weird
     
  12. May 19, 2012 at 8:43 AM
    #12
    boshak

    boshak Well-Known Member

    Joined:
    May 23, 2010
    Member:
    #37663
    Messages:
    514
    Gender:
    Male
    First Name:
    Tony
    Southern California
    Vehicle:
    2003 Manual 4x4 5VZ-FE
    OME 881's, Wheeler's 5-leaf pack, Bilstein 5100's
    Doesn't sound right. My cold idle range: 1000 to 1250. Operating idle: 600 to 850.
     
  13. May 19, 2012 at 10:59 AM
    #13
    Madjik_Man

    Madjik_Man The Rembrandt of Rattle Can

    Joined:
    Dec 2, 2009
    Member:
    #26893
    Messages:
    10,401
    Gender:
    Male
    Boulder, CO
    Vehicle:
    1998 Ext Cab TRD 5MT sunfire red pearl
    About 25 pounds of spray paint and vinyl dye
    My Tacoma had jacked up fluctuations like this, not too rapid, but very noticeable.

    Turned out to be a bad throttle position sensor
     
  14. May 19, 2012 at 11:26 AM
    #14
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    Yes in rapid succession, definitely not normal. Gonna run to the parts store and get some seafoam hopefully it stops raining here so I can work on it.
    Thanks for all the replies guys
    Cheers
     
  15. May 19, 2012 at 5:18 PM
    #15
    dentaco76247

    dentaco76247 Registered Mud Abuser

    Joined:
    Mar 23, 2012
    Member:
    #75467
    Messages:
    108
    Gender:
    Male
    First Name:
    Greg
    Justin, TX
    Vehicle:
    97 Tacoma xtra cab 4x4
    4Runner bucket seats, Upgraded headlights Blistein 5100s Blacked out Grille
    Rain??? what's that??:confused:
     
  16. May 19, 2012 at 5:31 PM
    #16
    Honey badger

    Honey badger Honey badger hits whatever tree he wants to hit!!

    Joined:
    Oct 22, 2009
    Member:
    #24735
    Messages:
    2,197
    Gender:
    Male
    First Name:
    Bon
    Kinder, Louisiana
    Vehicle:
    02 DC BLACK 3.4
    My low idle is at about 650 rpm's
     
  17. May 21, 2012 at 7:03 AM
    #17
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    Alright, Seafoamed, and carb cleaner looking for vacuum leaks, no dice!!!. Still doing it. Grrrr.....
    What should I try next?
     
  18. May 21, 2012 at 7:04 AM
    #18
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    Colorado weather, 84 one day and rain and 54 the next, gotta love it. :)
     
  19. May 21, 2012 at 4:17 PM
    #19
    dentaco76247

    dentaco76247 Registered Mud Abuser

    Joined:
    Mar 23, 2012
    Member:
    #75467
    Messages:
    108
    Gender:
    Male
    First Name:
    Greg
    Justin, TX
    Vehicle:
    97 Tacoma xtra cab 4x4
    4Runner bucket seats, Upgraded headlights Blistein 5100s Blacked out Grille
    The O2 sensors may be adjusting your a/f ratio searching for correct most efficient burn.
     
  20. May 24, 2012 at 10:54 AM
    #20
    trucruiser

    trucruiser [OP] Member

    Joined:
    May 18, 2012
    Member:
    #79076
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2 wheel drive
    Looks like I will try the O2 sensor next.
    Thanks for the input. I may tow it to the autoparts store and get it scanned first, see what codes they pull.
     
To Top