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

Misfire Issues after timing belt R/R

Discussion in '1st Gen. Tacomas (1995-2004)' started by castlekade677, Mar 15, 2019.

  1. Mar 15, 2019 at 8:17 PM
    #1
    castlekade677

    castlekade677 [OP] Member

    Joined:
    Mar 2, 2019
    Member:
    #285131
    Messages:
    6
    Gender:
    Male
    First Name:
    Kade
    Vehicle:
    2003 Toyota Tacoma Prerunner
    External Transmission Cooler
    I’m new to Tacoma World and have an issue with my 2003 Tacoma 4x4-

    Today i received my truck back from a timing belt job at a local shop while i was out of town for work. Immediately i noticed the truck had started to run horrible at idle. Eventually a P0340 code popped up for Circuit bank A Camshaft position sensor or generic sensor. So i took the truck apart per the FSM and here is what i found. I don’t have pics and i apologize.


    -Damage to my cam shaft sprocket, replaced along with a OEM Toyota Cam sensor. Did not solve issue.

    - after that i started having misfires only on Cylinders #2 and #5, codes P0305, and P0302. Coupled with a code P0300 Random Misfire detected on multiple cyclinders. I immediatey stopped the truck and again looked. To my surprise the truck somehow had a different colored Cam position sensor connector(female) that i hadn’t noticed before this whole repair or during my initial repair. To my suprise it seems, the mechanic had this code pop up after his job was done and looks to have replaced that sensor connector without my knowledge. He also rewired it backwards. I fixed this issue and rewired it correctly. I tried everything from changing out the plugs, wires, and new coil packs to see if misfires followed the coils and nothing worked. I then sadly ordered a new ICM and had my old one tested and it checked good and still ran bad with about 2000 rpm’s of load on the truck and had the same misfire codes pop up again. My main question is. Everything else “seems” to be doing its job. My next step is to try a new ECU. Does this seem like a sound decision.

    Update- Replaced ECU to no avail. Problem still persists.

    I would also like to add, i’m no expert but have had this truck for about 5 years and previously did the first timing belt R/R with no hiccups. The vehicle is a 2003 Toyota Tacoma Double Cab 4x4 AT. Mileage is 158,000.Thank you for all the help and feedback is appreciated. I’m trying my best not to parts swap at this point.

    Thank you guys.
     
  2. Mar 15, 2019 at 9:04 PM
    #2
    Pickeledpigsfeet

    Pickeledpigsfeet Well-Known Member

    Joined:
    Sep 19, 2013
    Member:
    #112813
    Messages:
    628
    Gender:
    Male
    Foothills, CA
    Sure sounds like a timing issue rather than a sensor issue. I assume you have started from scratch with the belt and confirmed piston at tdc by pulling plug? Did you confirm the crank shaft and pulley are not damaged and the key is there and not wobbly?He could have used a chain wrench on it and damaged it.

    Could you tell what/how the cam sprocket was damaged?
     
  3. Mar 16, 2019 at 5:22 AM
    #3
    castlekade677

    castlekade677 [OP] Member

    Joined:
    Mar 2, 2019
    Member:
    #285131
    Messages:
    6
    Gender:
    Male
    First Name:
    Kade
    Vehicle:
    2003 Toyota Tacoma Prerunner
    External Transmission Cooler
    I will post photos of the sprocket damage and confirm timing and the crank key to see if thats causing the issue. Thank you man
     
  4. Mar 16, 2019 at 7:43 AM
    #4
    castlekade677

    castlekade677 [OP] Member

    Joined:
    Mar 2, 2019
    Member:
    #285131
    Messages:
    6
    Gender:
    Male
    First Name:
    Kade
    Vehicle:
    2003 Toyota Tacoma Prerunner
    External Transmission Cooler
    Shown here is the “damage” the mechanic said was throwing off the sensor.

    79292F72-4FF3-47C9-9967-F28BB1864A6F.jpg
    FD0594CA-E545-4117-976B-A3E66721E2C5.jpg
     
  5. Mar 16, 2019 at 8:26 PM
    #5
    Luv my yota

    Luv my yota Well-Known Member

    Joined:
    Aug 27, 2017
    Member:
    #228278
    Messages:
    590
    Gender:
    Male
    Vehicle:
    00 turd lift 33's
    Everything
    It’s very hard to believe that the cam sprocket would be damaged like that ever, the whole setup is almost perfectly sealed so I say human error taking it off to put in the seal. If that happened on its own you’d be more likely to hit the biggest lotto win ever. Go smack that guy around like his Momma should have.:quickdraw:
     
  6. Mar 17, 2019 at 4:43 PM
    #6
    castlekade677

    castlekade677 [OP] Member

    Joined:
    Mar 2, 2019
    Member:
    #285131
    Messages:
    6
    Gender:
    Male
    First Name:
    Kade
    Vehicle:
    2003 Toyota Tacoma Prerunner
    External Transmission Cooler
    I will be trying to either get him to fix it or taking it some where else due to me going out of town for a couple months. I highly believe he chipped it re doing the seals and it upsets me.
     

Products Discussed in

To Top