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Old 06-16-2010, 05:15 PM   #1
PSM_02_WRX
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Default Car shakes slightly when shut off

I believe this could be my motor mounts, other say bad gas. What happens is I turn the key off after it runs and it shakes slightly. If anyone has seen a Diesel truck it shakes when shut off, that's what my car does. I have both diesel truck and Subaru so its easily comparable. Anyone know any reasons why the car would do this?
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Old 06-16-2010, 05:19 PM   #2
Jubert69
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Is it a noise or can you feel it shaking while you are in the car or both?
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Old 06-16-2010, 05:21 PM   #3
PSM_02_WRX
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No noise, just like after I turn the key off and car shuts off. Its not a violent shake but its noticeable.
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Old 06-16-2010, 05:21 PM   #4
bugeyerex02
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i get the same thing. it sort of feels like the car is dieseling when it shuts off. from what i understand its normal, unless someone here corrects me.
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Old 06-16-2010, 05:31 PM   #5
Jswansti
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The same thing happens to my car when I shut it off. Can just kind of feel it shaking/vibrating in your seat a little when you turn it off. I think it's pretty normal.
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Old 06-16-2010, 05:33 PM   #6
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Same thing happens on mine. I have a TT so I've opened my hood and watched my car turn off. The motor pitches a bit but I don't think it's too bad. New motor mounts are on my to-buy list, but not because I think the stock ones are bad or anything. I just want them.
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Old 06-16-2010, 08:08 PM   #7
JustinM88
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Mine does this too. I kinda like it though
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Old 06-16-2010, 08:19 PM   #8
TheStigg
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I have the same issue, but i have bad motor mounts. Everytime I shut the car off, it shakes and sqeeks. Bad motor mounts ftl!
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Old 06-16-2010, 08:45 PM   #9
SLIC VIC
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my '06 used to shake a bit when the motor was cut off, and my mechanic mentioned my mounts were cracked. Replaced with Group N mounts and i dont feel any shaking....could be the problem your having?
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Old 06-16-2010, 09:52 PM   #10
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what octane gas are you using? If the engine is running for significant time 3+ seconds after you turn the ignition off then the gas is detonating without spark (dieseling). The engine in my car has shaken a little bit (not running tho) on shutdown since it was new. . .just the boxer way i guess. . .
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Old 06-16-2010, 09:53 PM   #11
Trigun001
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they arent bad motor mounts they are just the standard elasticity of the subaru motor mounts. If you dont like the shaking (I didn't) go buy yourself a set of harder mounts for the engine and tranny. Next time you need a clutch or timing belt ask them to swap the mounts. Note that you will have increased NVH and for me this was my loudest upgrade.

Also there is literally zero chance that anyones cylinders are hot enough on shut off to get the gas to "diesel" I'll go into the math if anyone wants me to but really you will rarely see dieseling in a non diesel engine.
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Old 06-16-2010, 09:56 PM   #12
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Your engine mounts are shot. Replace them with Group-N's and be done with it.
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Old 06-17-2010, 03:28 PM   #13
SLIC VIC
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i always thought the detonation after the ignition ("dieseling") is cut was on carberated engines only due to the fuel system running on vacuum rather than your injectors and fuel pump? i could be wrong ::noobie voice::
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Old 06-17-2010, 04:48 PM   #14
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Quote:
Originally Posted by SLIC VIC View Post
i always thought the detonation after the ignition ("dieseling") is cut was on carberated engines only due to the fuel system running on vacuum rather than your injectors and fuel pump? i could be wrong ::noobie voice::
You are correct.

Vibration when you shut the car off is normal.
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Old 06-17-2010, 05:55 PM   #15
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It's because you have horizontally opposed cylinders.
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Old 06-17-2010, 08:11 PM   #16
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Quote:
Originally Posted by Big-E View Post
Your engine mounts are shot. Replace them with Group-N's and be done with it.

Not necessarily. I have near-new Group N mounts and I still get the shaking
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Old 06-17-2010, 10:50 PM   #17
miketheskibum
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I'm pretty sure it's normal. When a cylinder moves towards one side of the engine, it pushes the engine the opposite way. When the engine is running, it just shifts on top of the mounts, and before the force can be transmitted through the mounts to the frame, the engine will move in the opposite way, correcting the vibration (this is due to the horizontally opposed cylinders). When you turn the car off, the engine slows down so that it cannot correct the vibration before the momentum is transferred to the frame, so the car shakes back and forth a little. I don't KNOW any of this, but it makes sense in my head. *shrug*
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