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Does cylinder position matter for startup?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by foampile, May 6, 2016.

  1. May 6, 2016 at 4:09 PM
    #1
    foampile

    foampile [OP] Well-Known Member

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    My inclination is that yes, the position cylinders and therefore crankshaft does matter and that, if the crankshaft has been turned manually for testing purposes (e.g. a cylinder leakdown test), one of the cylinders needs to be reset to TDC in order for the startup to run properly, i.e. not misfire. Can you (dis)confirm this guess of mine ? Also, if I am correct, can you tell what cylinder position is required, in other words, which of the 6 needs to be in TDC ? Does it correspond to the firing order, where the front right (passengers) side fires first and therefore should be in TDC before starting the engine after manually turning the crankshaft?

    firing_order.gif
     
  2. May 6, 2016 at 4:13 PM
    #2
    deeezy

    deeezy Well-Known Member

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    No. Your engine doesn't stop your pistons at the same position every time you turn your engine off.
     
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  3. May 6, 2016 at 4:19 PM
    #3
    foampile

    foampile [OP] Well-Known Member

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    Ok. I thought I may have read somewhere that the ECU makes sure they stop in the same position it expects them to be in when it starts the engine. Maybe wrong...
     
  4. May 6, 2016 at 4:43 PM
    #4
    nd4spdbh

    nd4spdbh Well-Known Member

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    if you had moved the crank without moving the cams (ie you had the timing chain off) then you would have issues.... otherwise no, you can spin the motor to your hearts content and it will fire up regardless of where you position it.
     
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