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Hard startup question

Discussion in 'Technical Chat' started by scoob, Sep 13, 2010.

  1. Sep 13, 2010 at 4:16 PM
    #1
    scoob

    scoob [OP] Active Member

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    I have an '07 with the 4.0. If the truck sits for more than 3 hours or so you have to crank it over for about 3 seconds before it starts. It runs fine and there isn't a CEL. Cranks fine if you start it under that 3 hour window. I am thinking the fuel pump isn't priming, it starts fine sometimes because there is still enough fuel sitting in the cylinders to light it off. What do you guys think?
     
  2. Sep 14, 2010 at 7:12 AM
    #2
    BlueT

    BlueT Well-Known Member

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    I moded 1999 Taco so much it had turned to Land Cruiser
    How many miles?
    When you did your spark plugs?
    What type of fuel 87, 89, 93?
     
  3. Sep 14, 2010 at 8:18 AM
    #3
    scoob

    scoob [OP] Active Member

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    52k miles, have been using 87. I was going to check the plugs this weekend but it seemed like more of a fuel issue to me.
     
  4. Sep 14, 2010 at 9:54 AM
    #4
    BlueT

    BlueT Well-Known Member

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    I moded 1999 Taco so much it had turned to Land Cruiser
    Aha so you are 22K miles over the spark plug interval running 87.

    Spark plugs are your first thing to check and most likely culprit. fill with 93 and see if start up gets little better.
     
  5. Sep 14, 2010 at 10:24 AM
    #5
    scoob

    scoob [OP] Active Member

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    I mis read your post, they were changed at 30k but the truck has 52k on it. I'll try the 93 for a tank too.
     
  6. Sep 14, 2010 at 10:25 AM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    4.10 gears, sliders, and lots of buttons.
    5 seconds cranking is within normal perameters. Time it to make sure its actually taking long to start.
     
  7. Sep 15, 2010 at 10:07 AM
    #7
    DocBrown86

    DocBrown86 Yota Doc

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    toytec coil spacers, tokicko struts/dubcab springs, energy suspension rack bushings, bilstien hd shocks, K&N FIPK2, Flowmaster 50DF, ScanGuage2, 5000k HID's, horn mod, other stuff that I forgot to list
    Sounds like you are losing fuel pressure.

    Standard (running) fuel pressure is 41 psi, and rest pressure is 21 psi.

    Hook up a fuel pressure gauge and make sure your fuel pressure does not drop below 21 psi while your engine is at rest.
     
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