Mine does that out of the blue sometimes.
metalic rattle at startup
Thread Starter
Instructor
Joined: Mar 2007
Posts: 147
Likes: 0
From: Phoenix Arizona
metalic rattle at startup
When I start my 2008 c6 I hear a metalic rattle coming from just behind the front tires near the rear of the engine.
I suspect that it is exhaust related since it stops approx. 10 seconds after the car is started. I only notice it in the morning during cold start up.
Any idea what this noise could be?
I suspect that it is exhaust related since it stops approx. 10 seconds after the car is started. I only notice it in the morning during cold start up.
Any idea what this noise could be?
Thread Starter
Instructor
Joined: Mar 2007
Posts: 147
Likes: 0
From: Phoenix Arizona
Nope, not lifters. the sound is like shaking a coffee can with shards of metal in it. Very noticable, and loud. The lifters do make a slight noise at startup, but not this noise.
Thanks for your suggestion.
Thanks for your suggestion.
Burning Brakes
Joined: Sep 2008
Posts: 1,169
Likes: 21
Mine makes this noise also, when the ac is off on a cold start its not as loud.
Burning Brakes
Joined: May 2008
Posts: 909
Likes: 2
From: Orange County, CA State of Confusion
One possible cause of this is what I call rod rattle. It will only happen when car has been sitting for a while.
The oil filter check valve (the rubber diaphram under outer holes of filter) is not sealing and allows oil to drain out of intake line to filter. So upon initial start up you experience the rattle from lack of oil pressure creating the hydro-dynamic wedge of oil that help reduce metal to metal contact (which is what you maybe hearing).
Change your filter and check it before purchasing by (this sounds odd) blowing into large center hole, if you do not hear or feel air escaping from smaller intake holes filter is good to go. If its a leaker, back in box and check another.
This may or may not be the cause of your noise but is has worked for me and sounds like what you maybe encountering.
SR
The oil filter check valve (the rubber diaphram under outer holes of filter) is not sealing and allows oil to drain out of intake line to filter. So upon initial start up you experience the rattle from lack of oil pressure creating the hydro-dynamic wedge of oil that help reduce metal to metal contact (which is what you maybe hearing).
Change your filter and check it before purchasing by (this sounds odd) blowing into large center hole, if you do not hear or feel air escaping from smaller intake holes filter is good to go. If its a leaker, back in box and check another.
This may or may not be the cause of your noise but is has worked for me and sounds like what you maybe encountering.
SR
Burning Brakes
Joined: Sep 2008
Posts: 1,169
Likes: 21
One possible cause of this is what I call rod rattle. It will only happen when car has been sitting for a while.
The oil filter check valve (the rubber diaphram under outer holes of filter) is not sealing and allows oil to drain out of intake line to filter. So upon initial start up you experience the rattle from lack of oil pressure creating the hydro-dynamic wedge of oil that help reduce metal to metal contact (which is what you maybe hearing).
Change your filter and check it before purchasing by (this sounds odd) blowing into large center hole, if you do not hear or feel air escaping from smaller intake holes filter is good to go. If its a leaker, back in box and check another.
This may or may not be the cause of your noise but is has worked for me and sounds like what you maybe encountering.
SR
The oil filter check valve (the rubber diaphram under outer holes of filter) is not sealing and allows oil to drain out of intake line to filter. So upon initial start up you experience the rattle from lack of oil pressure creating the hydro-dynamic wedge of oil that help reduce metal to metal contact (which is what you maybe hearing).
Change your filter and check it before purchasing by (this sounds odd) blowing into large center hole, if you do not hear or feel air escaping from smaller intake holes filter is good to go. If its a leaker, back in box and check another.
This may or may not be the cause of your noise but is has worked for me and sounds like what you maybe encountering.
SR
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Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
My bet it is a heat shield near the Catalytic converter... or exhaust related...
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
I had one of my exhaust cans hitting the sheild above them and it made that sound. I also have had an exhuast clamp hitting one of the shields by the x pipe too that made that sound. Check there before you start getting crazy.
Thread Starter
Instructor
Joined: Mar 2007
Posts: 147
Likes: 0
From: Phoenix Arizona
OK, Here's the story.
I got under the car this weekend. The noise is coming from the x pipe.
If I hit the x pipe with my hand, I can hear the rattle. It is internal to the pipe. Any idea how to resolve this except remove the x pipe and see what the cause is?
I got under the car this weekend. The noise is coming from the x pipe.
If I hit the x pipe with my hand, I can hear the rattle. It is internal to the pipe. Any idea how to resolve this except remove the x pipe and see what the cause is?
Race Director
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
Did you check the center retaining clips as I said in post #10. That is the problem I had that drove me crazy. One was simply out of adjustment after the x-pipe was installed.
Racer
Joined: Aug 2004
Posts: 397
Likes: 0
From: New York
When I start my 2008 c6 I hear a metalic rattle coming from just behind the front tires near the rear of the engine.
I suspect that it is exhaust related since it stops approx. 10 seconds after the car is started. I only notice it in the morning during cold start up.
Any idea what this noise could be?
I suspect that it is exhaust related since it stops approx. 10 seconds after the car is started. I only notice it in the morning during cold start up.
Any idea what this noise could be?
Have a 2008 same here for a few second probably the exhaust. Only happens in the morning with me forget it its nothing. Leave it alone or your 10 second problem can go full time.
