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1999 3.4L Warm Start issue and code P0171

Discussion in 'Technical Chat' started by 707eric, Oct 18, 2011.

  1. Oct 18, 2011 at 11:59 PM
    #1
    707eric

    707eric [OP] Member

    Joined:
    Oct 10, 2011
    Member:
    #64944
    Messages:
    17
    Gender:
    Male
    Santa Rosa
    Vehicle:
    99 TRD 4x4
    I have 1999 Tacoma 3.4l. The truck has intermittent warm start issues. Occasionally after the truck has warmed up if you park for 5-10 minutes it will have a hard time starting. The engine will crank and you hear it trying to start but it just wont "catch" for lack of a better word. Usually within a minute or two of attempting to start it will fire and run fine.

    The other day I was driving and I got on it a decent amount and I later noticed the check engine light was on. I checked it with a code tester and it came back as error code P0171: System too Lean (Bank 1)

    So far the following has been done

    Replaced IAC Valve
    Replaced MAF Sensor
    Replaced ECT Sensor
    Replaced Fuel Pump
    Replaced Fuel Filter
    Cleaned and Balanced Injectors
    Replaced TPS
    Cleaned Throttlebody
    New Plugs
    New Air Filter (non-oiled air filter)
    Checked Valve Clearance

    Any ideas?
     
  2. Oct 20, 2011 at 11:30 AM
    #2
    707eric

    707eric [OP] Member

    Joined:
    Oct 10, 2011
    Member:
    #64944
    Messages:
    17
    Gender:
    Male
    Santa Rosa
    Vehicle:
    99 TRD 4x4
    Oh and both O2 sensors were already replaced.
     
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