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

Rough Idle After Valve Cover Gasket Job

Discussion in '1st Gen. Tacomas' started by kigmob, Dec 16, 2013.

  1. Dec 16, 2013 at 7:11 PM
    #1
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    So I went all out and replaced my valve covers, valve cover gaskets, intake plenum gaskets, cam plugs, spark plugs, plug wires, and a few other things. I also changed the oil, cleaned the throttle body/intake manifolds, and cleaned the MAF/air filter. When I put it all back together and started it, the truck ran great. As it began to idle down from the cold start, it started to sound like it was missing. Once it got to normal idle it really sounded like it was missing. It sounded like a Harley or like it had a cam in it. If I rev it up, it sounds normal. I checked for any vacuum lines not connected but they all seemed to be in place. No CEL as well. I also removed the negative from the battery and the EFI relay for 30 mins to reset the system. Not sure what the problem can be. I leaning towards something with the throttle body. Maybe the IAC valve? I did not remove and clean this. Just wondering why it would act up now? :confused: Thanks for any help!
     
  2. Dec 16, 2013 at 8:02 PM
    #2
    JLee50

    JLee50 Well-Known Member

    Joined:
    Nov 20, 2013
    Member:
    #116986
    Messages:
    393
    Gender:
    Male
    Phoenix
    Vehicle:
    Stockish 99 4x4 TRD
    ToyTec coilovers
    Recheck all of your plug wires.
     
  3. Dec 17, 2013 at 4:45 AM
    #3
    wolfgang123

    wolfgang123 Well-Known Member

    Joined:
    Jul 7, 2009
    Member:
    #19369
    Messages:
    1,360
    Gender:
    Male
    First Name:
    Skyler
    Statesboro, GA
    Vehicle:
    1997 TACOMA - 4x4
    Definitely check your IAC
     
  4. Dec 17, 2013 at 4:49 AM
    #4
    BostonBilly

    BostonBilly Well-Known Member

    Joined:
    Jan 11, 2012
    Member:
    #70435
    Messages:
    7,473
    Gender:
    Male
    Easton
    Vehicle:
    2015 Jeep Wrangler Sahara
    Also check for vac leak
     
  5. Dec 17, 2013 at 7:56 AM
    #5
    tacomataco2

    tacomataco2 Well-Known Member

    Joined:
    Nov 27, 2012
    Member:
    #91944
    Messages:
    1,750
    Gender:
    Male
    Eastham Mass
    Vehicle:
    02 Dbl cab Silver
    Bilstein 5100's, eibach coils, u bolt flip, Dakars/d6xl, Ome shackles, Poly sway bar bush, Poly rack bush, voltmeter, led guage lights, magnaflow stainless catback, stainless cats, deckplate mod, afe filter, tundra brakes,PIAA fogs behind grillecraft, color matched grille, soft topper, Projector retrofit, Allpro bumper , Blitzpro light bars, Alpine/ rock fosgate sound system, 35% tint, Some derped stuff
    Probably left something unplugged.. Check everything. Though harleys do sound sweet...
     
  6. Dec 17, 2013 at 8:16 AM
    #6
    tan4x4

    tan4x4 Well-Known Member

    Joined:
    Nov 30, 2011
    Member:
    #67982
    Messages:
    1,841
    Gender:
    Male
    First Name:
    Rick
    Folsom, CA
    Vehicle:
    99 Tacoma EC 4x4 2.7L Auto
    Bilsteins, OME 881's, 3-leaf AAL, Detroit TruTrac, stock gears, stock-size tires, Michelin LTX AT2, Tranny skidplate, sliders, UltraGauge, PowerTank, CB
    Why did you do the 'gasket job' in the first place? Was there an initial problem?

    You could have one or more vacuum lines connected to the wrong ports. Did you mark them before you disconnected stuff?
     
  7. Dec 17, 2013 at 8:20 AM
    #7
    bldegle2

    bldegle2 OldPhart

    Joined:
    Apr 16, 2013
    Member:
    #102169
    Messages:
    1,064
    Gender:
    Male
    floyd, VA
    Vehicle:
    2000 Prerunner TRD
    throttle body extension, K&N dropin, custom rear sway bar, bilsteins, 2010 Tacoma 17" alloys w/265's, driveshaft mods, bullbar, .75" Bora hubcentric spacers
    how come new valve covers? were the stock ones toast?


    definitely have something hooked up wrong, throwing any codes or check engine light yet?
     
  8. Dec 17, 2013 at 8:46 AM
    #8
    BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

    Joined:
    Jan 31, 2012
    Member:
    #71846
    Messages:
    9,376
    Gender:
    Male
    First Name:
    Bill
    Navarre, FL
    Vehicle:
    1997 Tacoma 4X4 AKA "Blue Beast"
    Multi-point tow hooks, new bored 2.7L engine, custom paint. 3 inch adjustable Fabtech front coils, 2.5 inch rear AAL. Front Aussie locker. LED bed lights. Full LED conversion interior and exterior. Relentless Fabrication front and rear bumpers. 4X4innovation sliders. BAMF bed rack. CVT rooftop tent.
    Check all your connections to all sensors. Make sure, as mentioned, that you did not connect a vacuum line to the wrong port. Double check your brake booster vacuum line. If you have access to a data reader look at your fuel trim numbers after the engine has warmed up. If the fuel trim is a positive number, the engine is running lean, and you have some sort of vacuum leak. It happens to the best of us, but it is very possible that when you did the intake manifold gaskets, that something was not tightened down properly, or a gasket shifted during installation. Usually a small bottle of propane, and a propane torch tip can be used to find vacuum leaks. Simply turn the propane torch on WITHOUT lighting it, on a low setting, and move the tip around the intake manifold. When you get close to the leak the engine will start to run smoother and may increase slightly in RPMs due to the vacuum leak drawing in the propane into the engine.
     
  9. Dec 17, 2013 at 9:14 AM
    #9
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    I did the job because the gaskets were leaking oil badly. And I took pics of everything under the hood before the tear down.

    I got new valve covers because I cracked one side by over tightening the bolt. I will be checking all connections today.

    I do not have access to a data reader at the moment. However I will check all connections again. Thanks for the detailed response!

    They do sound sweet :cool:

    Will do.

    Will do.

    Will do this also. Would love to fix it without taking the TB off again...
     
  10. Dec 17, 2013 at 9:59 AM
    #10
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    So I checked all connections and then started it up. It did the same thing. Decided to take it for a spin (did not do this last night). After about a 10 min drive around the block and on a small road where I got up to 45 mph, it seems to be idling fine. :confused: However it does seems to be a tad bit high (850-900) w/ no AC. Usually it idles at about 700-750. I'll see what happens from here... Thinking back on it, I may have damaged the TPS while LOADING my TB with intake cleaner. But who knows. I think too much. It seems ok now so I'll let it be and see how it goes..
     
  11. Dec 17, 2013 at 11:55 AM
    #11
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    Spoke too soon. Took it for a drive again and the weird idle came back for a little bit and it threw a CEL. My SG showed P0130, P0133, and P0171. After looking up these codes I'm pretty sure its the front O2 sensor (bank 1, sensor 1). Any other suggestions?
     
  12. Dec 17, 2013 at 4:10 PM
    #12
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    Bump. About to buy the O2 sensor but would like to get any suggestions before. The codes make me think it has to be that O2 sensor. Just weird that it would malfunction after all the work I did which had nothing to do with that O2 sensor..
     
  13. Dec 22, 2013 at 8:08 PM
    #13
    kigmob

    kigmob [OP] Well-Known Member

    Joined:
    Jul 18, 2012
    Member:
    #82906
    Messages:
    769
    Gender:
    Male
    First Name:
    James
    New Orleans/Baton Rouge
    Vehicle:
    97 TRD S/C 4x4 V6 5spd
    ICON/TC MidTravel TRD Supercharger
    Replaced the upstream O2 sensor and cleared the codes. All codes cleared except the P0171 code. After some searching, this codes seems to be a pain to fix. I'm guessing (since I had the whole intake apart to install the valve covers) it's a vacuum leak that I have not found yet. Any other suggestions? I plan on replacing the majority of my vacuum lines. Hopefully this helps.
     
  14. Dec 24, 2013 at 10:17 AM
    #14
    michaelw.grey

    michaelw.grey Well-Known Member

    Joined:
    May 28, 2013
    Member:
    #105119
    Messages:
    103
    Gender:
    Male
    First Name:
    mike
    pensacola, florida
    Vehicle:
    98 4x4 SR5 3.4L V6 AUTO Ext Cab
    tinted windows, low pro black tool box, line-x spray in bedliner over rails, rain guards, 55w 5000k hids
    looking forward to seeing what the issue was

    subd
     
  15. Dec 24, 2013 at 11:41 AM
    #15
    Changeling

    Changeling Well-Known Member

    Joined:
    Nov 17, 2011
    Member:
    #67202
    Messages:
    80
    Gender:
    Male
    Maryland
    Vehicle:
    2001 Tacoma TRD SRD V6 X-Cab Limited Edition
     
    Last edited: Dec 24, 2013
  16. Dec 24, 2013 at 11:49 AM
    #16
    taco47001

    taco47001 Newborn

    Joined:
    May 11, 2012
    Member:
    #78644
    Messages:
    1,710
    Gender:
    Male
    Aurora, IN
    Vehicle:
    Silver Taco
    3" Lift (Billies 5100 front and back), Toytec springs, All Pro 3" Standard Pack, LR UCA's, Diff Drop, SCS F5's, 265/75/16 Treadwright Wardens, Rear Diff Breather, pinch weld mod, Morimoto Projector retro w/ amber halo's, grey wire mod, Elite front bumper....so far....
  17. Dec 24, 2013 at 11:55 AM
    #17
    taco47001

    taco47001 Newborn

    Joined:
    May 11, 2012
    Member:
    #78644
    Messages:
    1,710
    Gender:
    Male
    Aurora, IN
    Vehicle:
    Silver Taco
    3" Lift (Billies 5100 front and back), Toytec springs, All Pro 3" Standard Pack, LR UCA's, Diff Drop, SCS F5's, 265/75/16 Treadwright Wardens, Rear Diff Breather, pinch weld mod, Morimoto Projector retro w/ amber halo's, grey wire mod, Elite front bumper....so far....
     
  18. Dec 24, 2013 at 12:10 PM
    #18
    Changeling

    Changeling Well-Known Member

    Joined:
    Nov 17, 2011
    Member:
    #67202
    Messages:
    80
    Gender:
    Male
    Maryland
    Vehicle:
    2001 Tacoma TRD SRD V6 X-Cab Limited Edition
    Look at it anyway you like.
     
  19. Dec 24, 2013 at 1:21 PM
    #19
    Loggerhead

    Loggerhead Well-Known Member

    Joined:
    Apr 23, 2013
    Member:
    #102646
    Messages:
    135
    Gender:
    Male
    First Name:
    Seán
    Alaska
    Vehicle:
    1998 Cool Steel Metallic 4x4
    Still mostly stock . . .
    Sounds like kigmob is talking about the maf sensor. Cleaning the maf sensor will probably be beneficial.

    I'm leaning towards a possible vacuum leak after taking the intake all apart. Try getting a can of starting fluid and spray it around vacuum line connections. The engine will idle up a bit if the connection is leaking.

    Good luck OP! Keep us posted. . .
     
  20. Dec 24, 2013 at 1:35 PM
    #20
    taco47001

    taco47001 Newborn

    Joined:
    May 11, 2012
    Member:
    #78644
    Messages:
    1,710
    Gender:
    Male
    Aurora, IN
    Vehicle:
    Silver Taco
    3" Lift (Billies 5100 front and back), Toytec springs, All Pro 3" Standard Pack, LR UCA's, Diff Drop, SCS F5's, 265/75/16 Treadwright Wardens, Rear Diff Breather, pinch weld mod, Morimoto Projector retro w/ amber halo's, grey wire mod, Elite front bumper....so far....
    Fixed...:D
     
To Top