2005 Subaru Forester Low RPM vibration

2005SUBARUFORESTER

MEMBER
2005 SUBARU FORESTER
4 CYL
AWD
AUTOMATIC
63,500 MILES

I bought a brand new '05 Forester, and at about 10 or 15K miles, I noticed a very slight vibration when I came to a stop at a light (it did not seem significant enough to correct). After taking my car in for 60K service, my car started to shake/rattle very badly at low RPM when the vehicle is either stopped or moving less than 3-4 mph in any gear. It happens about 25% of the time (rest of the time, there is no noticable vibration). I took my car back to the shop, and the diagnosis was that the car needed new engine mounts and new transmission mounts. I took the car to the dealer for a 2nd opinion, and their diagnosis is that the car needs a new torque converter. Have you got any idea what the problem is?

7 Replies

KHLOW2008

MECHANIC
41,815 POSTS

Hi 2005subaruForester,

Thank you for the donation.

I would suspect it to be engine mounts. What is the idling rpm? Is your vehicle still covered by warranty?

I could not find any Technical Bulletins on faults with torque converters.

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Friday, September 5th, 2008 AT 10:30 AM

2005SUBARUFORESTER

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Thanks for the quick reply.

Idling RPM is about 750. If starting engine cold and in park, idling RPM is about 1000.

I am not under warranty. I have followed the maintenance schedule religiously. So I'm a little angry.

Is there any particular reason you suspect engine mounts?

My limited knowledge of engine mounts is that they don't break, they just wear out, so I guess there's no way I can inspect them visually to determine if there's anything wrong with them?

The mechanic at the dealership said he had trouble diagnosing the problem, so he called Subaru technical help, and they told him to rotate the torque converter 180 degrees, and apparently since the vibration was worse then, that meant the torque converter was bad.

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Friday, September 5th, 2008 AT 8:09 PM

KHLOW2008

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Hi,

Since your mechanic has tested by rearranging the torque converter installed position and it has caused more vibrations, I guess we have to accept that the unit is faulty and needs to be replaced.

If engine mounts rubbers are not broken, the only thing you can see visually is if they are sagging.
You can place a jack under the engine and lift it up slightly to reduce the pressure on the mounts. If vibrations decreases, it means the mounts are weak.

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Saturday, September 6th, 2008 AT 7:45 AM

2005SUBARUFORESTER

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How can I be fairly certain I've got the problem diagnosed correctly before I spend a month's salary trying to correct the problem?

I put a jack under what appeared to be a motor mount and applied very slight pressure. When I started the car the vibration was gone. Do you think I can rule out the torque converter?

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Monday, September 29th, 2008 AT 9:20 PM

KHLOW2008

MECHANIC
41,815 POSTS

Hi 2005subaruForester,

Since relieving the pressure on the engine mounts eliminates the vibration, we can safely say the the engine mounts are bad.

It just crossed my mind that while rotating the torque converter, your mechanic might have tampered with the engine mounts or engine position resulting in more pressure on them and more vibrations.