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Old 08-11-2011, 06:43 PM   #1 (permalink)
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Default Vibration at idle

Edited for clarification............................

I have noticed a high speed buzz/vibration around 700-1000 rpm at idle, in park or drive, in my son's car (2007 Forester, NA, auto). I can feel it in the center armrest and it changes with RPM. I don't feel it much above 1000rpm. I reported it to the dealer but they say it's normal. Just doesn't feel right to me.
Anybody else notice this?

Thanx!
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Old 08-12-2011, 02:56 AM   #2 (permalink)
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Is the high speed vibration faster than the idle, at a higher frequency, more cycles per second than 700-800 rpm of idle?
By buzz, do you mean the vibration makes an audible sound?
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Old 08-12-2011, 02:12 PM   #3 (permalink)
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Yes to higher frequency. Can't hear it but I can feel it in the armrest. It's a tad annoying.
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Old 08-13-2011, 02:36 AM   #4 (permalink)
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So there is a faint vibration that can not be heard, but can be felt in the armrest, at 700 rpm idle in both Park and Drive, and the vibration rises in speed with engine speed until 1,000 rpm when it can no longer be felt.
Is this vibration only felt when the cold engine is first started , or is it felt with a hot engine, too?
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Old 08-13-2011, 05:51 AM   #5 (permalink)
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So there is a faint vibration that can not be heard, but can be felt in the armrest, at 700 rpm idle in both Park and Drive, and the vibration rises in speed with engine speed until 1,000 rpm when it can no longer be felt.
Is this vibration only felt when the cold engine is first started , or is it felt with a hot engine, too?
Yup. Notice it after the car has been running as well. My first thoughts were a tranny mount or something similar.
Most noticeable between idle and 900 rpm.
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Old 08-14-2011, 03:04 PM   #6 (permalink)
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A vibration that can only be felt through the arm rest, not heard, and only between 700 and 900 rpm. My 2008 is totally smooth in this respect.

Possibly something loose inside your driver side door? In the window regulator motor and linkage?

When I first bought my 2008 there was a momentary glitch that could be felt but not heard, as the window first arose from the door. The feeling came through the arm rest. The dealer said it was probably in the window lifting mechanism, and eventually it went away.

Because you only feel this vibration in your arm rest, perhaps it is likewise originating only inside the door.
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Old 08-14-2011, 06:13 PM   #7 (permalink)
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I should have been more specific about the arm rest. it's the center console arm rest. That's why I tend to think tranny or power train.
Sorry about that.
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Old 08-16-2011, 08:04 AM   #8 (permalink)
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So it's a transient vibration felt in the console armrest in Park or Drive of a 4EAT, between 700-900 rpm, which would only be with a warmed-up engine as a cold engine won't idle that low. My '08 4EAT is completely vibration-free.

Could it be from something in or underneath the storage box under the arm rest?
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Old 08-18-2011, 08:30 PM   #9 (permalink)
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I started out noticing a shaking at idle and went away when driving or even put in Neutral at idle... not much later lost a timing belt.
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Old 08-19-2011, 03:00 AM   #10 (permalink)
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I started out noticing a shaking at idle and went away when driving or even put in Neutral at idle... not much later lost a timing belt.
So shaking at idle could be a way to tell that the timing belt is about to break?
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Old 08-19-2011, 03:03 AM   #11 (permalink)
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How severe is this shake? Is it just a subtle side to side, or more? Mine sometimes does it too.
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Old 08-24-2011, 03:52 PM   #12 (permalink)
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Quote:
Originally Posted by vintage42 View Post
So it's a transient vibration felt in the console armrest in Park or Drive of a 4EAT, between 700-900 rpm, which would only be with a warmed-up engine as a cold engine won't idle that low. My '08 4EAT is completely vibration-free.

Could it be from something in or underneath the storage box under the arm rest?
Does it at cold startup idle as well. Nothing in the storage box.

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How severe is this shake? Is it just a subtle side to side, or more? Mine sometimes does it too.
It's a buzz or shake that I can feel in my hand. Definitely noticeable.
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Old 08-25-2011, 03:26 AM   #13 (permalink)
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Does it at cold startup idle as well...
Cold startup idle is initially almost 1,500 rpm. Even after tapping the accelerator pedal the idle is over 1,000 rpm, then begins to drop in the next 5-10 seconds. You have said the vibration is only in the 700-900 rpm range.

So you are not immediately feeling the vibration in the arm rest until the cold startup idle has dropped below 900 rpm on its way to warm idle at 700 rpm.

To be something so sensitive to a specific rpm range, and such a low rpm range, and in that area under the console around the transmission, maybe the problem is caused by an exhaust system heat shield or hanger.
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Old 08-25-2011, 03:48 AM   #14 (permalink)
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A boxer engine is theoretically in perfect balance, but the two opposing cylinder banks are slightly offset to accommodate the big ends on the crankshaft. This results in a slight imbalance only noticeable at idle speed. Once the revs rise it disappears.
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Old 08-25-2011, 05:46 AM   #15 (permalink)
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I agree about how specific a rev range it has to be in. Sounds like something is resonating at that speed like the exhaust system as vintage42 says. If you can only feel it when you touch it and it's not severe thats a lot better than the whole car shaking! I wouldn't be worried about it too much.
One way to solve it is to not put your hand on the centre arm rest and worry yourself! Seriously though, if it's only then that you notice it probably isn't some to be concerned about.
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