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Fluctuating high idle , backfiring at idle

Discussion in '1st Gen. Tacomas (1995-2004)' started by Tacodrama4311, Oct 31, 2024.

  1. Oct 31, 2024 at 11:27 AM
    #1
    Tacodrama4311

    Tacodrama4311 [OP] Active Member

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    Hey guys so recently I had a code for my knock sensors, I replaced them and the harness along with the gaskets, fuel injectors (cheep pos ones from advance auto, half aisan half no name. I know I fucked up there)
    I replaces my spark plugs from iridium single ground to denso platinum dual ground, and replaced my pcv valve.
    I also cleaned my throttle body and iac along with new gaskets for both.
    Problem is my truck idles high , around 1000 after it warms up but it also has a slight miss, I can here it backfire at idle pretty slightly .more of a bummed I did all this work for it to run worse kinda thing instead of a performance issue.
    But the other thing is after a hard accel rpms will float up and down for 30 seconds from 1000 to 1400 and settle.
    When cruising through town suddenly the engine will brake itself intermittently when I let off throttle.
    I made sure all my vaccum lines were good.
    I did clean my maf with brake kleen like a dipshit
    And I'm just curious what your guys first guess would be given my symptoms.
    Trucks a 99 3.4 m/t 4x4
    260 k miles.
    Has had headgaskets 20k miles ago heads were checked for cracks and they checked out good.
    Before I did this work my only issue was intermittent powerband above 2000 rpms from knock sensors.
    Thanks in advance!
     
  2. Oct 31, 2024 at 4:01 PM
    #2
    treyus30

    treyus30 It's 70% complete 70% of the time

    Joined:
    Jun 24, 2015
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    First Name:
    Trey
    Mesa / AJ, AZ
    Vehicle:
    '99 5VZ-TT 14PSI+
    Two spooly snails, Haltech 2500, 35s, 125kmi, raptor lined
    Without codes it's hard to say, but sounds like MAF or TPS
     
  3. Nov 1, 2024 at 1:07 PM
    #3
    Tacodrama4311

    Tacodrama4311 [OP] Active Member

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    Yeah no codes, actually It had a pending code at first but it went away, I don't remember what it was but it said something about the idle.
    Oh I forget to mention, I put a 2001 auto tranny tacoma cluster in it.
    It doesn't read rpm accurately it fluctuates from 4 to 800 rpm over actual values. I read rpm with torque pro
     
  4. Nov 2, 2024 at 5:33 PM
    #4
    Tacodrama4311

    Tacodrama4311 [OP] Active Member

    Joined:
    Sep 30, 2023
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    #434587
    Messages:
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