timing belt change rough idle

Posted by Nikolay_Ruskov, Nov 28, 2009

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  1. Nikolay_Ruskov

    Nikolay_Ruskov Proven Member

    203
    2
    Joined Jan 25, 2008
    san antonio, Texas
    I change my timing belt and now rough idle and engine vibration
    What can be wrong here is the video
    YouTube - Eclipse Gst 1997

    the sound is ok is not from now
     

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    Last edited: Nov 28, 2009
    My DSM:
    1997 Mitsubishi Eclipse GST

    12.741 @ 113.810 MPH
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  2. beans33

    beans33 Probationary Member

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    0
    Joined Sep 22, 2005
    Franklin Sq, New York
    First thing i would do is check if it's in time again. It's possible a tooth might have skipped, which would definitely cause a rough idle.
     
  3. Nikolay_Ruskov

    Nikolay_Ruskov Proven Member

    203
    2
    Joined Jan 25, 2008
    san antonio, Texas
    i checked and looks good to me.

    Can this be from the crankshaft position sensor ? because i change my water pump and i didn't drain the coolant from the engine and when i remove the pump alot of coolant get over the sensor and other parts
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    12.741 @ 113.810 MPH
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  4. richardc475

    richardc475 Proven Member

    105
    0
    Joined Jul 28, 2008
    Cobble Hill,
    Your oil pump balance shaft is probably a rotation out causing the vibration.
     
  5. Demon33

    Demon33 Proven Member

    286
    1
    Joined Aug 11, 2008
    Southern, California
    +1^
    If the oil pump sprocket is out of phase, it will cause vibration.


    Taken from the VFAQ-

    Remove the balance shaft plug on the rear side of the cylinder block and insert a Phillips screwdriver {shank diameter 8 mm (.32 in.)} through the hole. The balance shaft is in the correct position if the screwdriver can be inserted at least 60 mm (2.4 in.). If the inserted depth is less than this only 20-25 mm (.8-1.0 in.), the oil pump sprocket must be rotated one full turn and timing marks realigned. Recheck the balance shaft position using the screwdriver to ensure that it can be inserted 60 mm (2.4 in.) or more. Keep the screwdriver inserted until timing belt installation is complete (Figure 13).

    NOTE that there is an easier way to do this. Simply rotate the mark on the oil pump sprocket until it is pointing straight up, and let it go. If the sprocket rotates towards (counterclockwise) the timing mark on the engine, the oil pump sprocket is aligned correctly. If it rotates away (clockwise) from the mark, spin the sprocket a full turn and test again, and it should properly rotate towards the mark now. Now line the mark on the sprocket back up with the mark on the engine. This avoids having to remove the rear access bolt entirely.
     
  6. Nikolay_Ruskov

    Nikolay_Ruskov Proven Member

    203
    2
    Joined Jan 25, 2008
    san antonio, Texas
    oil pump sprocket is good i checked already.
    If the crankshaft position sensor is not good the car will not start at all or may cause this?
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    12.741 @ 113.810 MPH
    Loading...
  7. PieEyedPiper

    PieEyedPiper DSM Wiseman

    4,317
    41
    Joined Nov 13, 2004
    North Bay Area, California
    From the vibrations visible in the video it either has to be out of time or it the oil pump is out of phase.
     
    My DSM:
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  8. richardc475

    richardc475 Proven Member

    105
    0
    Joined Jul 28, 2008
    Cobble Hill,
    Just cause the marks are lined up on the oil pump does not mean it is in phase, give it a full rotation, put it vertical and let go, if it falls towards the timing mark then it is in phase, if it falls away from the timing mark it is out and needs to be spun.
     
  9. Nikolay_Ruskov

    Nikolay_Ruskov Proven Member

    203
    2
    Joined Jan 25, 2008
    san antonio, Texas
    ok i will check again. but i open the balance shaft plug on the rear side of the cylinder block and insert a Phillips and it was good.
    If the cams are line up together not in the middle but a little bit over the middle can this be the probllem like a 4mm
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    12.741 @ 113.810 MPH
    Loading...
  10. DSM8ALL

    DSM8ALL Probationary Member

    13
    0
    Joined Aug 14, 2008
    Co. Bluffs, Iowa
    When you change the timing belt, a good way to check the cam alignment is to lay a straight edge across the gears. Like a piece of paper or anything with a straight flat edge. All the marks should line up. The 2 on the outside, and the 2 on the inside. Cam alignment can cause rough idle and vibration.
     
  11. nyTalonTsi

    nyTalonTsi Proven Member

    443
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    Joined Sep 5, 2008
    Buffalo, New York
    +1, when my exhaust cam was off, my motor vibrated like that too.

    A bad crank sensor would cause misfire at idle, but it looks like timing is off.
     

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