1. Welcome to 4Runners.com!

    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 4Runner discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other 4Runner owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Very Bad Constant Sputter

Discussion in '3rd Gen 4Runners (1996-2002)' started by JustBadLuck, Nov 6, 2016.

  1. Nov 6, 2016 at 4:01 PM
    #1
    JustBadLuck

    JustBadLuck [OP] New Member

    Joined:
    Nov 6, 2016
    Member:
    #2967
    Messages:
    7
    Gender:
    Male
    1996 4Runner SR5 3.4 - 280,000+ miles

    I have a constant sputter when the gas pedal is pressed. It is especially bad at certain speeds (55-65) and going up hill. The sputter seems to be getting worse despite the recent work to cure it. I recently replaced
    • Spark Plugs
    • Spark Plug Wires
    • All 3 Coils
    • All 6 Fuel Injectors
    • Both O2 Sensors (upflow/downflow)
    I also used 44K and filled with premium gas on two occasions, back to back.

    Nothing helps! My CarMD reads 0 errors. Any suggestions? :(
     
  2. Nov 6, 2016 at 6:36 PM
    #2
    Relentless

    Relentless Offroad armor Fabricating beast! Vendor

    Joined:
    Apr 18, 2014
    Member:
    #74
    Messages:
    221
    Gender:
    Male
    First Name:
    Eric
    Sparks NV
    Vehicle:
    05 Limited 4.7 V8, long travel, dual locked
    Lifted on 35s and Relentless Armored, too much to list!
    Fuel filter clogged and starving for fuel? Dirty MAF?
    If you've done all the above on your own then both of these would be pretty easy to do without having to pay a mechanic to diagnose.
     
    bahndrvr and JustBadLuck [OP] like this.
  3. Nov 7, 2016 at 4:40 AM
    #3
    JustBadLuck

    JustBadLuck [OP] New Member

    Joined:
    Nov 6, 2016
    Member:
    #2967
    Messages:
    7
    Gender:
    Male
    Thanks for your reply. I'll try the Fuel Filter. I would think the scanner would pick up the MAF...? But if the filter doesn't work I'll try the MAF too.
     
  4. Nov 7, 2016 at 7:01 AM
    #4
    Relentless

    Relentless Offroad armor Fabricating beast! Vendor

    Joined:
    Apr 18, 2014
    Member:
    #74
    Messages:
    221
    Gender:
    Male
    First Name:
    Eric
    Sparks NV
    Vehicle:
    05 Limited 4.7 V8, long travel, dual locked
    Lifted on 35s and Relentless Armored, too much to list!
    Well OBD would have picked up a faulty MAF or injector also so the fact they were changed and not part of the issue doesnt surprise me. MAF could just be really dirty if it's never been cleaned. If it isnt throwing codes then no need to replace, just inspect/clean as necessary. They have specific MAF cleaner at an autoparts store
     
    bahndrvr likes this.
  5. Nov 7, 2016 at 8:51 AM
    #5
    bahndrvr

    bahndrvr New Member

    Joined:
    Aug 29, 2016
    Member:
    #2570
    Messages:
    110
    Gender:
    Male
    First Name:
    Trevor
    Melbourne, Fl
    Vehicle:
    03 SR5 V8 4Runner
    2003 4Runner SR5 v8 - Temp Front: Top hat spacer 2.5" on Tacoma struts/springs Rear: TJM/King heavy extended Tacoma shocks 315 BFG AT KO2's (35's) Thrush Welded muffler and rear watermelon delete with turned exit K&N drop in, and extra filter delete Strengthened/Welded passenger side front diff mount Front diff drop - due to the top hat spacer and massive droop.... Scion headunit CB Other stuff done, 6th 4Runner:)
    had the same thing happen to mine multiple times-

    Want my advice - buy a bunch of hoses to fit your vaccum hoses all over the engine bay, then replace them one at a time - doesn't take a super long time -seems like I had 3 different sizes and 3 feet of the really small diameter, 4 feet of the medium diameter and 6 feet of the larger diameter and had plenty of extra. The 3.4 is a vaccum pig man - if one of those hoses comes loose or cracks, all hell breaks loose.

    I would recommend trying to pull and locate as many as you can - I would be willing to bet if the fuel filter doesn't fix it - the vaccum hoses would be the culprit. Armed with this knowledge I found a bad running one and fixed it for my buddy on a test drive, then we removed the vaccum I had found and put it back to how it was when we drove off the lot for test drive. He bought it for super cheap, and we fixed it before we drove off.

    The main reason I'm thinking it's vaccum is it won't throw a code, sometimes it will throw an inefficiency for vaccum related issues but that's not guaranteed. Just food for thought, and it's super cheap to do the hoses IIRC to replace all of them was under 20 bucks for me, warning though some are extreme pains in the ass.
     

Products Discussed in

To Top