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Maintenance & Repairs: Oil choices, timing belt, setting timing, CV boot replacement, alternator servicing, fuse/relay checks, and other basic maintenance, repair and diagnosis discussions. Probationary Members can post here.

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Old 11-28-2009, 12:41 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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2G-specific

timing belt change rough idle


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


Last edited by Nikolay_Ruskov; 11-28-2009 at 03:44 PM.
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Old 11-28-2009, 12:55 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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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.

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Old 11-28-2009, 06:28 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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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
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Old 11-28-2009, 06:48 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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Your oil pump balance shaft is probably a rotation out causing the vibration.

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Old 11-28-2009, 06:57 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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Quote:
Originally Posted by richardc475 View Post
Your oil pump balance shaft is probably a rotation out causing the vibration.
+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.

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Old 11-28-2009, 07:12 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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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?
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Old 11-28-2009, 07:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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From the vibrations visible in the video it either has to be out of time or it the oil pump is out of phase.


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Old 11-28-2009, 07:26 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
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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.

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Old 11-28-2009, 07:46 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
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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
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Old 11-28-2009, 09:09 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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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.


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Old 11-28-2009, 09:23 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #11 (permalink)
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Quote:
Originally Posted by DSM8ALL View Post
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.
+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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