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Loss of acceleration/jerking when accelerator to floor.

Discussion in '3rd Gen 4Runners (1996-2002)' started by Martin M., Apr 20, 2021.

  1. Apr 20, 2021 at 6:19 PM
    #1
    Martin M.

    Martin M. [OP] New Member

    Joined:
    Apr 20, 2021
    Member:
    #21052
    Messages:
    11
    Gender:
    Male
    Bought a 3rd gen (1999) 4Runner Ltd in January with 204k. Immediately began having issues starting and then it began jerking at 30 and 60 mph when accelerator was fully depressed. Did all the obvious, MAF, plugs, wires, coil packs, PCV, tested all sensors (multimeter). Eventually I decided to just replace fuel pump, sending unit, filter, fuel pressure regulator, TPS, cleaned throttle body, and cleaned injectors and replaced two that were non Denso. Figured out the starting issue was a bad MAF sensor and the jerking was a non Denso crankshaft position sensor. I'm learning these Toyotas like the Denso sensors. Sure hope this helps someone that may have encountered these similar issues.
     
    negusm and Thatbassguy like this.
  2. Apr 21, 2021 at 8:20 AM
    #2
    negusm

    negusm New Member

    Joined:
    Oct 22, 2019
    Member:
    #11745
    Messages:
    589
    Gender:
    Male
    Vehicle:
    2002 4Runner SR5 4WD
    Yeah. USE TOYOTA or OEM SUPPLIER parts!

    Especially for ignition components and sensors.

    Mile for mile they are the CHEAPEST.

    Cheap Chinese stuff may go 30k miles...but Toyota parts go for a quarter million.
     
    Martin M. [OP] likes this.
  3. Apr 21, 2021 at 8:22 AM
    #3
    Martin M.

    Martin M. [OP] New Member

    Joined:
    Apr 20, 2021
    Member:
    #21052
    Messages:
    11
    Gender:
    Male
    Thanks bassguy, hopefully save someone a big headache and/or divorce...The wifee was nagging me about the time I was spending with the 4Runner and not her.
     

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