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

2.7L Stumble - Throttle Position Sensor Impact and Disection

Discussion in '1st Gen. Tacomas (1995-2004)' started by Wsidr1, Jul 15, 2018.

  1. Jul 15, 2018 at 6:59 PM
    #1
    Wsidr1

    Wsidr1 [OP] Well-Known Member

    Joined:
    Jul 11, 2018
    Member:
    #259004
    Messages:
    3,079
    Gender:
    Male
    Indiana
    Vehicle:
    2 x 95.5 Ext 2.7L & 3.4L A/T 4x4
    New to posting, but regular reader.
    My 1995.5 2.7L, ext cab, auto, 4x4 had a stumble point just above idle, but ran fine once above about 10 mph. I felt it was likely TPS, so I ordered one and replaced the sensor. It did indeed eliminate the hesitation that occurred under normal, light acceleration. Ho, hum.
    However, what I wanted to pass along is I believe I could have repaired my TPS and been fine. I know, normally electrical components are just remove/replace items. However, if you are like me, you are always looking for ways to "cheat the system" on cost. Also, I just wanted to know why that TPS fixed my problem and how it works.
    First step, cut away the plastic holding the metal cover in place.

    Cutting Away Seal.jpg
    Then, pry open the case. Be careful not to go too deep with the blade, as you will damage the water seal.
    Prying Open Case.jpg

    After removing the cover, there are two plastic tabs you must cut.

    Tab Removal.jpg

    Then, bend back the white circuit brd. The connectors are quite robust, so they will not be damaged.
    Circuit Brd Reveal.jpg

    On my sensor, there were contaminants which could have easily been removed from Contaminant Pic.jpg one of the circuits.

    There are several other possible problems which you may want to confirm if you try to repair and reuse one of these sensors.
    Relaxation of the recoil pressure of the contact points against the circuit board. You can easily reshape them for increased contact pressure to the board.

    Bending Contact Tabs.jpg

    Cleaning these same contact points is another good idea while you have it apart..

    Use some good heat resistant epoxy to re-create the tabs holding the circuit board in place, then reseal the metal cover. The cover has a very nice water seal which was not damaged by my dis-assembly.

    The TPS on first gen 2.7L appears to be a very simple, but expensive, rheostat type device. No "logic" involved, so I feel repairing one involves little risk.

    Contact Point Closeup.jpg
     
    Slickster likes this.

Products Discussed in

To Top