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Old 01-31-2012, 01:00 PM   #1
CaseDoc
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Default Chattering sound at low speeds + torn timing belt

I have a 2005 STI with 60k miles. I recently started hearing a pretty loud chattering sound coming from the engine during certain instances. There sound does not appear until the car is warmed up. On cold day there will be no sound until it has been driven for a good 5-10 minutes. The sound then starts at around 10mph and continues to around 30mph. It goes away within 3 seconds of engaging the clutch regardless of the speed.

I was poking around to see if I could notice anything out of the ordinary and saw that my timing belt has a tare oriented along the long axis of the belt. The tare is about 4 inches long.

Anyone know if the timing belt is likely to be the source of the chattering?
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Old 01-31-2012, 01:48 PM   #2
subaru_sti_steve
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If your timing belt is torn I would not drive your car hard as if it breaks it can result in catastrophic damage. I would replace the belt immediatly and yes as its spinning it slaps around the gears and tensioner which should be a consistant noise though.
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Old 01-31-2012, 02:30 PM   #3
rick-l
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describe this tear.

When you say engaging the clutch do you mean the pedal is in or out?
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Old 01-31-2012, 03:27 PM   #4
CaseDoc
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I mean pedal down. Also I think the torn belt in question is actually the drive belt and not the timing belt.
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Old 01-31-2012, 03:43 PM   #5
rick-l
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An AC or a Power Steering/Alt belt are not going to destroy your engine when they break but it probably would only take you 10 minutes to change it.

So when you push the clutch in and remove torque from the drive train the clicking goes away. It could be almost anything but I would look at your (front since it sounds like engine) CV joint boots first.
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