WTF is shaking under my car!
12-17-01, 08:24 PM
#1
The Sloth
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WTF is shaking under my car!
I'm posting this again because I still haven't found where the noise is coming from. I have a rattling/clanking sound coming from somewhere under my FD. When the engine and other components are cold the sound is much more evident. My neighbor heard it when I was pulling out of the garage and suggested that it came from the front. When I ease the clutch out and proceed at avery low rpm the clanking sound is quite loud. You know when you take off at a low rpm the clutch chatters and everything shakes. Well that's when the clanking is most obvious. However the sound occurs over speed bumps or most other significant bump(s). When everything warms up, the clanking/rattling sound diminishes significantly. I went underneath the car and shook the hell out of the exhaust system (factory), banging on heat shields, just about everything but could not replicate the noise.
Could I have cracked engine mount(s), a broken suspensiion component or dameged sway bar mount ( I will be checking the sway bar next).
Any suggestions would be well appreciated!
Could I have cracked engine mount(s), a broken suspensiion component or dameged sway bar mount ( I will be checking the sway bar next).
Any suggestions would be well appreciated!
12-17-01, 08:32 PM
#2
It's never fast enough...
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There is a metal plate right on the bellhousing which prevents dirt and other stuff from getting within the clutch area. This plate is removable to be able to inspect the clutch without bringing down the tranny.
Check that plate. It may be loose, but YES, it COULD be a bushing. Did you also check around the tranny bushings?
Check that plate. It may be loose, but YES, it COULD be a bushing. Did you also check around the tranny bushings?
12-17-01, 08:38 PM
#3
The Sloth
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The tranny bushings and/or mounts sounds very plausable because the noise is "heavy" sounding, if you know what I mean, not like a light weight plate shaking around.
Thanks for that suggestion.
Thanks for that suggestion.
12-17-01, 08:41 PM
#4
It's never fast enough...
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If its a heavy thump, it COULD be a bushing.
If you release the clutch quickly, does it make the thump? That amount of force is usually enough to make the entire drivetrain move.
Another thing you could try, is jack up the FD and put it on jackstands, get in and engage the clutch with the engine on, and have someone to the side doing a visual on the drivetrain to see how it's moving around.
If you release the clutch quickly, does it make the thump? That amount of force is usually enough to make the entire drivetrain move.
Another thing you could try, is jack up the FD and put it on jackstands, get in and engage the clutch with the engine on, and have someone to the side doing a visual on the drivetrain to see how it's moving around.
12-17-01, 08:59 PM
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The Sloth
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If I give it enough gas while engaging the clutch, to prevent any chatter or shaking, noise is absent. Only when the drive train is shaking will the clanking happen. Yea apparently significant force is generated during the shaking. Since my ability to reproduce the sound by shaking things under the car was ineffective. That's why I was thinking somenthing with a lot of mass, is moving in an unconstrained fashion.
12-17-01, 10:49 PM
#6
Senior Member
I've never heard what it sounds like, but your symptoms sound similar to one's described by another forum member when his Power Plant Frame was cracked. Do a search here in the 3rd gen section on PPF and see if you can find the thread.
12-18-01, 02:04 AM
#7
make sure the inside core of your muffler or cat hasnt shifted that will rattle like hell. Grab both sides and shake or tap it with your fist and see if anything rattles around.
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12-18-01, 05:56 AM
#9
20B N/A Wide Body FC3S
Sounds like the power plant frame... I've seen 3 of them broken... usually it will crack about half way threw towards the tranny side and then flex and hit stuff, also check to see if some of the bolts haven't come loose where it bolts to the tail housing on the tranny...
One way to check it is to dump it and if you hear a loud smacking sound as it hits the lower body you'll know thats what it is for sure..
One way to check it is to dump it and if you hear a loud smacking sound as it hits the lower body you'll know thats what it is for sure..
12-18-01, 08:24 AM
#11
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Honey Comb Filter
Honey Comb Filter inside my stock catalytic converter got loose and rattled, and until I had a mechanic look at it, I had no clue. Had it replaced with a N-Tech High Flow, no more rattling noise + noticeable increase in HP.
12-24-01, 03:02 AM
#12
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I'm 95% certain the noise is coming from the engine mounts. I shook the motor and the sound occured. The harder I shook the louder the clanking/scraping sound. I suppose I need to replace the bushings. Are there stiffer after market bushings available?
12-24-01, 11:05 AM
#14
Tequila? ..it's like beer
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U joints
A friend of mine had a very similar problem with his jeep.. it would rattle like hell when there was no load on the diff, especially as it warms up in the morning.. turned out to be some really ratty u joints on the driveshaft.
12-24-01, 12:06 PM
#15
20B N/A Wide Body FC3S
Unless your pushing 380+ hp, just put in new stock mounts and get an engine tork brace. Also it's probably just the left mount that is bad. It gets pulled appart by the engine torking.. the right side get's smashed so it usually doesn't go bad.. Also check all the stupid heat shiels around the turbo, maybe one has come loose and is hitting somthing...
What part of the car is the noise comming from? near the tranny, right side of the engine, left side, etc...?
What part of the car is the noise comming from? near the tranny, right side of the engine, left side, etc...?
12-24-01, 01:25 PM
#16
Rotary Enthusiast
You can shake your motor? Hmm I can't barely move my motor. Sounds like you have bad mounts. A torque reaction strut brace will also help. Although I am not sure of the long term consequences of one. They make a huge difference though.
Mike
Mike
12-25-01, 11:48 PM
#21
20B N/A Wide Body FC3S
Put a 2x4 under the oil pan and lift the engine with a jack, or use a tranny jack, but only put enough pressure on it to lift the engine, DO NOT LIFT THE WHOLE CAR LIKE THIS... make sure your remove the 14mm engine mount bolts first...
12-29-01, 12:38 AM
#25
20B N/A Wide Body FC3S
I've only seen one right side one broke, there are several layers of heat sheild between the turbo and the mount, One of then is actually bolted to the mount... Heat isn't a problem there..