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Cold Start Sputter

Discussion in '1st Gen. Tacomas (1995-2004)' started by pat1694, May 31, 2013.

  1. May 31, 2013 at 3:12 PM
    #1
    pat1694

    pat1694 [OP] New Member

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    I have a 99 PreRunner with a 2.7l engine. For a while now the truck has had these....."sputters". I'll turn the key and the engine will fire, and then it will start to sputter and vibrate and idle really low. After about 15-25secs the truck will start to slowly idle fine. I've replaced the fuel pump a few months ago,replaced fuel filter 2 months ago,replaced the air filter,replaced plugs and wires,replaced both O2 sensors,cleaned the throttle body and IACV,and replaced PCV valve. The truck has 449,8XX miles on it,if that helps at all. Have any ideas of what could be the problem??
     
  2. May 31, 2013 at 8:04 PM
    #2
    Supra TT

    Supra TT Solid Axle FTMFW!!

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    Eric
    Lafayette, Indiana
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    2000 SAS D44/Ford 9"
    SAS.. Need I say more.
    450k miles? Well done lol :cool: That's all I got, sorry.
     
  3. Jun 1, 2013 at 1:41 PM
    #3
    JudoJohn

    JudoJohn Well-Known Member

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    your head gasket may be failing. but with 450K that's not bad!
     
  4. Jun 1, 2013 at 5:18 PM
    #4
    hayabusa3303

    hayabusa3303 Well-Known Member

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    Mike
    florence sc
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    95.5 taco 4x4
    ARB bumper, warn 9.5 winch. carbon fiber hood. Leer top with thule racks and MOAB from thule. Electric fans, blue sea fuse block, Sony dvd Head unit, Xm tuner and HD tuner. New carpet and new racing seats. ( other half doesnt like them i think). Nwor springs and adjustable coil overs. Sky jacker rear shocks. Slot and drilled rotors. Engine Titanium ceramic coated headers, no cat, jba cat back. URD Rear Sensor Simulator. Leds all around and inside cab and HID H4 hi/lo beams.
    Check the compression on it.. Could be valves need to be adjusted some.. OR

    One more thing could be your injectors could be going bad or fuel regulator..
     
  5. Jun 3, 2013 at 8:30 AM
    #5
    pat1694

    pat1694 [OP] New Member

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    Which should I check first?? The injectors and fuel pressure regulator,or the compression and valves??
     
  6. Jun 3, 2013 at 9:36 AM
    #6
    JudoJohn

    JudoJohn Well-Known Member

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    check compression first. look in the cylinders to see if you see any coolant on the pistons, if so, you have a HG leak. the injectors would either work or not work, so I say look at HG. if you have unlimited money, then keep throwing parts at it. Otherwise, try to diagnose by troubleshooting. Troubleshooting is simply isolate and eliminate---check different parts/systems and isolate them and eliminate them as a cause.
     
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