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Old 12-22-2017, 09:10 AM   #1
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Default Clunk when lifting off throttle?

Guys, my FWD 2003 Cadillac Seville has developed a clunk when I lift off the throttle. It's not severe yet but it needs to be fixed. I'm guessing a mount or bushing or something like that. From inside the car the noise seems to be coming from the rear but I know noises can be deceptive. If I lift off throttle very gently, the car does not clunk. Lift abruptly and it clunks.

Edit: It's actually more of a click than a clunk. Heavy click. Maybe a clack? No, it's a heavy click.

Advice?
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Old 12-22-2017, 10:39 AM   #2
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Look into the front lower motor mount. They are notorious on Bonneville's (which share that platform). The cheap fix is called a hockey puck mount. Basically you get a couple hockey pucks, a big screw and R&R that crap OEM one.

Due to photobucket going to shit, his photos are gone, but he lists what is needed for a GXP which is the same.
http://www.pontiacbonnevilleclub.com...opic31405.html
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Old 12-22-2017, 10:46 AM   #3
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Damn that looks like a PITA. Thanks for the input.
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Old 12-22-2017, 10:50 AM   #4
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But you should never have to worry about it again and it's cheap. Just time.
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Old 12-22-2017, 11:04 AM   #5
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I have no garage down here and my driveway slopes a little. I can jack up a car but it's not the easiest thing to work underneath especially with the fire ants. Never know when a new nest is going to show up next to the driveway and the bastards find you.

I may have to bite the bullet and take it to the neighborhood Tuffy for diagnosis and possibly repair. I'm trying to form a relationship with those guys because they are better than other shops I have tried. No way am I bringing the car anywhere near a dealer. I could buy another used Caddy cheaper than what they would charge.

I do have some high speed vibration as well so the problem could be the mount, a bushing or both. I was hoping someone like you would have an easy fix. I'll do some more research on the motor mount fix and think about pulling the car apart next week after dusting the driveway area for ants. Thanks again.
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Old 12-22-2017, 11:07 AM   #6
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Sorry about the ants. They're like wasps to me. They always seem to find me.
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Old 12-22-2017, 02:41 PM   #7
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Just don’t lift. Then no clunk.
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Old 12-22-2017, 02:47 PM   #8
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Ha Ha! That's what I was doing today. No lifty, no clunky. Why is it always a holiday weekend?
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Old 02-27-2018, 02:06 PM   #9
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UPDATE: I had the local Tuffy change the motor mounts using parts I got from Rock Auto. Night and day difference. Clunk is gone. Ride is more solid. High speed shimmy is gone. Well worth the money.
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