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Old 08-23-2013, 10:23 AM   #1
Type2
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Member#: 200436
Join Date: Jan 2009
Chapter/Region: MWSOC
Location: Lawrence, KS
Vehicle:
2004 Forester XT
Black

Default 2004 FXT automatic shakes / shudders under light acceleration / load

2004 FXT with 230k miles. Recently this has been getting worse. Started a few months ago. Only noticeable on my turnpike commute, usually when accelerating slowly or with cruise control on.

The car shakes under acceleration. The steering wheel doesn't vibrate. But I can feel it in the gas pedal, the seats, the dash, basically the whole car.

When I let off the gas (decelerate) the shaking goes away.

The transmission is automatic and shifts quickly and as far as I can tell, at the correct time. I am pushing a lot of hp, but have not been driving it hard until I get my new injectors and tune.

No CEL's.

I recently had a wheel bearing replaced and the other ones were inspected and passed. All 4 tires recently replaced and balanced due to a random idiot slashing my tire. This issue was before the tires were replaced.

I've read the problem could range from a bad torque converter, injectors,cv joints, driveshaft, ujoint, rear axles, transmission or engine mount.

I could replace all those but I'd like to know what is the most likely. In other words, what should be my priority in terms of troubleshooting.

Thanks.
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Old 08-23-2013, 10:38 PM   #2
Hoon Goon
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Join Date: Oct 2012
Chapter/Region: South East
Location: In Denial
Vehicle:
2008 WRX - Hatch
WRB - Kornluvr

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First step is to check for burnt fluid and clutch material in the fluid. Search out for good and bad indicators. Second is drain and replace fluid. Third is to take it to someone that knows about that kind of witchcraft. Tranny is probably just getting old and the clutch packs are worn (especially if it has been notably progressive) , but I don't know anything about vodoo or sorcery. Not very many people do because we are not witches. Good luck on a solution.
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Old 08-26-2013, 12:00 AM   #3
Strider327
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Member#: 131280
Join Date: Nov 2006
Chapter/Region: BAIC
Location: Northern California Hayward
Vehicle:
2004 Impreza WRX
WRB

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Check your engine and transmission mounts. If you do not have any odd noises that would be the best spot to check.
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Old 08-27-2013, 05:17 PM   #4
Type2
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Location: Lawrence, KS
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2004 Forester XT
Black

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Quote:
Originally Posted by Strider327 View Post
Check your engine and transmission mounts. If you do not have any odd noises that would be the best spot to check.
Thanks! I was looking at my front left axle closest to the trans and it looked like the boot is loose and some grease has been flung around. I think I'll have someone take a look at that as well.
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