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

replaced valve cover gaskets - truck wont start

Discussion in '3rd Gen 4Runners (1996-2002)' started by ramonortiz55, Jan 5, 2017.

  1. Jan 5, 2017 at 8:31 PM
    #1
    ramonortiz55

    ramonortiz55 [OP] New Member

    Joined:
    May 3, 2015
    Member:
    #590
    Messages:
    1,664
    Gender:
    Male
    First Name:
    Ramon
    Vehicle:
    2001 4runner limited silver millenium
    So here is my issue, which I will explain with much as much detail as possible.

    I replaced my valve cover gaskets last Monday. First time ever doing it, took me all day. When i work on my vehicles, i like to take my time, being careful with everything i do.

    Once i put everything together, the 4runner wouldnt start.

    It would take me two or three tries to get the truck to start, when it would start, it would rev up to 3,000 RPMs, and turn off. Nothing more. Every, single time.

    After a few tries, i noticed there would be a faint thump - Like air pushing out.

    I also noticed the check engine light turned on. So i ran the codes:

    P1120 - Accelerator Pedal Position Sensor Circuit Malfunction

    P0120 -Throttle/Pedal Position/Switch "A" Circuit Malfunction

    P0115 - Engine Coolant Temperature Circuit Malfunction

    P0110 - Intake Air Temperature Circuit Malfunction

    P0100 - Mass or Volume Airflow Circuit Malfunction

    I knew that i either didnt connect something OR i left something unplugged.

    I took everything apart, checked my connections.

    BAM -

    My Connections:

    [​IMG]

    The correct connections, per @willhaman21

    [​IMG]

    I had accidentally plugged the PCV hose into the black airbox and the black airbox hose into the PCV valve.

    :anonymous:

    :bananadead:

    Well I went ahead and swapped them correctly.

    I disconnected the battery for about 30 minutes to clear the codes and tried turning the 4runner.

    Nothing.

    The 4runner turns on, sputters off.

    I still hear that faint thumping noise.

    Codes cleared and stayed off. Didnt come back on.

    I am at a loss here, i feel the only path forward is to take everything apart and check again for any more loose connections, hoses, etc.

    Did I screw anything up by trying to start the truck with the hoses connected incorrectly?
     
    Last edited: Jan 5, 2017
  2. Jan 5, 2017 at 8:31 PM
    #2
    ramonortiz55

    ramonortiz55 [OP] New Member

    Joined:
    May 3, 2015
    Member:
    #590
    Messages:
    1,664
    Gender:
    Male
    First Name:
    Ramon
    Vehicle:
    2001 4runner limited silver millenium
     
  3. Jan 6, 2017 at 7:49 AM
    #3
    UssMoGn

    UssMoGn That Vegas Dude

    Joined:
    Apr 9, 2015
    Member:
    #558
    Messages:
    426
    Gender:
    Male
    First Name:
    James
    Vehicle:
    1996 TaCoRunner
    Extented Coil Lift. Custom bumpers
    Well id say MOST your lines are correct. They are preformed and cut to right length, its is almost impossible to run a line to wrong spot. Id have to say no you probably didn't tank your motor cause the vacuum lines. Make sure your is clear. id have to find it but there is a way to RESET everything and allow the truck to relearn your diving habits, i had to do this after my had my 3.4L rebuilt. You have to jumper some pins together in the Maintenance plug on side of the motor. Also check your PCV valve thats a quick fixer. Ive had to replace mine twice now.
     
  4. Jan 6, 2017 at 11:41 AM
    #4
    ramonortiz55

    ramonortiz55 [OP] New Member

    Joined:
    May 3, 2015
    Member:
    #590
    Messages:
    1,664
    Gender:
    Male
    First Name:
    Ramon
    Vehicle:
    2001 4runner limited silver millenium
    figured it out.

    The lower intake manifold wasn't seating correctly on the engine.
     
    Palerider and UssMoGn like this.

Products Discussed in

To Top