Exhaust area rattle -- need help
07-21-2010, 10:22 AM
#1
1st Gear Member
Thread Starter
Join Date: Sep 2008
Location: VA
Posts: 119
Exhaust area rattle -- need help
A while back I had my Boomtubes adjusted and ever since then I've noticed a rattle originating from the exhaust area. The strange thing is, this rattle is ONLY heard at initial start-up. After about 30 seconds to a minute the rattle is gone. I could drive around all day on a rough road and hear nothing.
Any idea where this rattle could be coming from? Obviously it sounds like something is warming up after a bit making the rattle go away but I can't imagine what would do this so quickly.
Any idea where this rattle could be coming from? Obviously it sounds like something is warming up after a bit making the rattle go away but I can't imagine what would do this so quickly.
07-21-2010, 10:36 AM
#2
The Paranoid One
Join Date: Apr 2006
Location: Texas
Posts: 5,320
The exhaust area?
You are going to have to be more specific.
Are you talking about the exhaust tip area where you connected the boomtubes?
If you had them adjusted in that area and had no rattle before... then common sense tells you that it was adjusted wrong and that is the area the rattle is coming from.
Could be a hangar problem, could be not bolted on quite tight enough, could be touching something.
Maybe the point where it is not correct settles in that spot after the car is not run for a while and the initial startup rattles it until it just goes back into place.
You are going to have to get under there and play around with it.
Let the car sit and when it is cold go under and see if you can shake anything or if anything feels loose.
Id just take them off and start from scratch and keep a close eye on everything you are doing. Or if you had them installed go back to the shop and they can help you with it.
You are going to have to be more specific.
Are you talking about the exhaust tip area where you connected the boomtubes?
If you had them adjusted in that area and had no rattle before... then common sense tells you that it was adjusted wrong and that is the area the rattle is coming from.
Could be a hangar problem, could be not bolted on quite tight enough, could be touching something.
Maybe the point where it is not correct settles in that spot after the car is not run for a while and the initial startup rattles it until it just goes back into place.
You are going to have to get under there and play around with it.
Let the car sit and when it is cold go under and see if you can shake anything or if anything feels loose.
Id just take them off and start from scratch and keep a close eye on everything you are doing. Or if you had them installed go back to the shop and they can help you with it.
07-21-2010, 11:22 AM
#4
6th Gear Member
If it's occuring on initial startup, then I suspect that it goes away as the system heats up which could be clamps that need tightening or a harmonic vibration. The exhaust harmonics change as the exhaust and engine warm up and there are issues with heat shields rattling at certain frequencies.
07-21-2010, 11:24 AM
#5
6th Gear Member
Check your hanger-to-frame clearances both cold and then hot. As the system expands from heat, the hangers have been known to touch the frame on some setups.
Last edited by Nuke; 07-21-2010 at 11:31 AM. Reason: spelling
07-21-2010, 11:27 AM
#6
5th Gear Member
Join Date: Aug 2009
Location: Philadelphia, PA
Posts: 4,256
07-21-2010, 12:39 PM
#7
2nd Gear Member
Join Date: Apr 2007
Location: The Hinterlands of Minne-snow-ta
Posts: 401
+1
Heat Shields
Heat Shields
If it's occuring on initial startup, then I suspect that it goes away as the system heats up which could be clamps that need tightening or a harmonic vibration. The exhaust harmonics change as the exhaust and engine warm up and there are issues with heat shields rattling at certain frequencies.
07-21-2010, 12:42 PM
#8
The Paranoid One
Join Date: Apr 2006
Location: Texas
Posts: 5,320
I don't see why it would be the heat shields though if he did not have this problem before he adjusted his mufflers.
If he messed with an x pipe or something I could imagine heat shields more.
Maybe I'm wrong?
If he messed with an x pipe or something I could imagine heat shields more.
Maybe I'm wrong?
07-21-2010, 02:36 PM
#9
Join Date: Jun 2010
Location: AR
Posts: 38
I had this problem. On one the hanger was touching the car when it was cold rattle at startup. On the other side it touched the frame when it heated it.
It was touching on the back hangers where the end of the metal rod sticks out from the hanger.
It was touching on the back hangers where the end of the metal rod sticks out from the hanger.
07-21-2010, 02:40 PM
#10
The Paranoid One
Join Date: Apr 2006
Location: Texas
Posts: 5,320
Needs to shake his mufflers to see exactly what they are doing and secure those hangers.