Engine Shakes on Shut Down
Thread Starter
Instructor
Joined: Sep 2009
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From: PA
Engine Shakes on Shut Down
Hi,
I have a 2004 Manual Coupe with about 14k miles on it.
When I turn the car off, the engine shakes pretty vigorously. To the point where the car actually rocks a bit.
I was reading leaftye's post on common problems and it does talk about this a little bit in the "Drivetrain rattling" section:
"Sometimes you'll hear a horrible rattle if you shut off the engine. If you press the clutch pedal in while shutting off the car, you won't hear it."
Depressing the clutch when shutting off the car does help, but does not eliminate the problem completely.
Has anyone else experienced this? Any ideas as to what it might be?
My first thought is that it could be the motor mounts. Unfortunately, I am not sure where to look for them and didnt have much luck finding info on where theyre located. Can I even inspect them without putting the car on a lift?
How much does it cost to have motor mounts replaced?
Any thoughts, comments or suggestions would be appreciated.
I have a 2004 Manual Coupe with about 14k miles on it.
When I turn the car off, the engine shakes pretty vigorously. To the point where the car actually rocks a bit.
I was reading leaftye's post on common problems and it does talk about this a little bit in the "Drivetrain rattling" section:
"Sometimes you'll hear a horrible rattle if you shut off the engine. If you press the clutch pedal in while shutting off the car, you won't hear it."
Depressing the clutch when shutting off the car does help, but does not eliminate the problem completely.
Has anyone else experienced this? Any ideas as to what it might be?
My first thought is that it could be the motor mounts. Unfortunately, I am not sure where to look for them and didnt have much luck finding info on where theyre located. Can I even inspect them without putting the car on a lift?
How much does it cost to have motor mounts replaced?
Any thoughts, comments or suggestions would be appreciated.
Last edited by Compaq; Sep 20, 2009 at 06:20 AM.
Drifting
Joined: Mar 2004
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From: cincinnati ohio
Senior Member
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they all do it . . . . depress your clutch when you turn it off . . . . mine does not "rattle" when you do that . . . . I heard the explanation once but do not recall the specific reason it does "rattle" .
Melting Slicks
Joined: May 2007
Posts: 2,050
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From: At the Office (in NC)
Honestly tho its normal. The motor mounts on C5s are very soft (mainly because the crowd that bought C5s when they were being made was a little older and liked em softer - the C5 was supposed to be somewhat luxurious)... and the rattle is likely your throwout bearing, if you leave your car in neutral a lot with the clutch in it wears out the t/o bearing, however, its just somewhat annoying and not harmful even then... Nothing out of the ordinary.
If it really bothers you, swap the motor mounts for poly-urethane ones... However be warned, if you do that, you'll feel much more of the engines vibrations ALL OVER the cabin
- You will, arguably, pick up some more engine response and put more horsepower to the wheels.
Last edited by RideZX6R; Sep 20, 2009 at 08:11 AM.
Thread Starter
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From: PA
So the engine shaking insanely on shut down is normal? Well, thats good, I think. 
I had a '99 C5 Coupe automatic and the engine never shook like this on shut down, which is why I am concerned.
I had a '99 C5 Coupe automatic and the engine never shook like this on shut down, which is why I am concerned.
Banned Scam/Spammer
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From: Fort St John B.C
The rattle when the clutch is not depressed is normal.
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Thread Starter
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From: PA
Seriously? Because I was about to go on a phone calling blitz tomorrow morning. 
I was gonna call Conte's, County Corvette, Kerbeck and even Rothrock! Ask em all if this is normal and then compare prices on having new motor mounts installed...
And what do I really expect them to say? Sure thats normal, have a good day!
Theyre businesses. Theyll all say, bring it in and let us check it out...
I was gonna call Conte's, County Corvette, Kerbeck and even Rothrock! Ask em all if this is normal and then compare prices on having new motor mounts installed...
And what do I really expect them to say? Sure thats normal, have a good day!
Theyre businesses. Theyll all say, bring it in and let us check it out...
Last edited by Compaq; Sep 20, 2009 at 04:25 PM.
Drifting
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From: Florida, Hell's Doorstep
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From: PA
Ok, guess I'll sleep a little better tonight.
Gotta look at the good and the bad. The bad, the engine shakes like its gonna flop out of the car. The good, if I time it properly, I can drown out the sound of my farts by letting loose at the same time I cut the engine.
Gotta look at the good and the bad. The bad, the engine shakes like its gonna flop out of the car. The good, if I time it properly, I can drown out the sound of my farts by letting loose at the same time I cut the engine.
Thread Starter
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From: PA
Well, I got out to County Corvette today. They witnessed me turning the car off and said its normal. Yay. 
However, I asked them about a noise that the clutch was making. With the engine running, clutch in, put the car into gear then back into neutral, let the clutch go, and it makes this clankity popping noise. I was like is this normal? They said yes!
There was another C5 manual there and it did the exact same thing. I feel like I just got a ton of bricks off of my shoulders...
You know how much it costs to "check" or change a clutch? A LOT!!!
However, I asked them about a noise that the clutch was making. With the engine running, clutch in, put the car into gear then back into neutral, let the clutch go, and it makes this clankity popping noise. I was like is this normal? They said yes!
There was another C5 manual there and it did the exact same thing. I feel like I just got a ton of bricks off of my shoulders...
You know how much it costs to "check" or change a clutch? A LOT!!!
Le Mans Master
Joined: Jul 2009
Posts: 9,526
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From: Los Angeles California
Normal... Like others said, keep the clutch in when you turn off the car. After the engine stops spinning, let go of the clutch. I do this to save time: I press the clutch in, shift into reverse (for parking reasons) and shut the car off at the same time.
Banned Scam/Spammer
Joined: May 2006
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From: Fort St John B.C
Im confused as there seems to be two seperate issues here.
1. The engine shakes/vibrates like its ready to come loose, and
2. The normal clutch noise when pedal is not depressed.
Unless a slight exxageration was used when describing the engine vibration....?
1. The engine shakes/vibrates like its ready to come loose, and
2. The normal clutch noise when pedal is not depressed.
Unless a slight exxageration was used when describing the engine vibration....?
Racer
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From: lancaster pa
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From: PA
The noise from the clutch really only became apparent to me as I was turning around in my driveway today. Its probably a separate issue, even though depressing the clutch while shutting off the car, did reduce the noise from the engine but did not reduce the vibration.
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From: PA
Initially they said that it is not a sound they are familiar with, put the car on a lift and had someone in the car shifting while someone was beneath the car inspecting. They thought it was ok. This was confirmed when they walked me over to another manual C5 and it made the exact same noise.
