new rattle
Thread Starter
Intermediate
Joined: Aug 2018
Posts: 29
Likes: 1
From: Dayton Ohio
new rattle
I am fighting a new rattle in my '99 C5, all stock, with 70K miles. I have done exhaustive searching
this forum and see no such similar noise. I know what it is not. It is not exhaust system, rear latch, speaker grill, power train etc. My noise is in the rear passenger underside of the vehicle.
It sounds like plastic on plastic but is very audible on rough roads and has a sympathetic resonance @3500-4000 RPM.
I think it may be coming from the fuel line pressure relief lines or relief valve but adding deadening foam to these components
has only slightly reduced the noise. Anyone had this?
this forum and see no such similar noise. I know what it is not. It is not exhaust system, rear latch, speaker grill, power train etc. My noise is in the rear passenger underside of the vehicle.
It sounds like plastic on plastic but is very audible on rough roads and has a sympathetic resonance @3500-4000 RPM.
I think it may be coming from the fuel line pressure relief lines or relief valve but adding deadening foam to these components
has only slightly reduced the noise. Anyone had this?
Le Mans Master
Joined: Jul 2011
Posts: 7,426
Likes: 970
From: Morristown New Jersey
Oldtimer
Check all your compartments in the back, exhaust system, seat belts including the mount. Sound is a traveler. My dashboard rattle ended up to be misadjusted hood bumpers.
Instructor
Joined: Jan 2005
Posts: 245
Likes: 40
From: Hollister, California
I am fighting a new rattle in my '99 C5, all stock, with 70K miles. I have done exhaustive searching
this forum and see no such similar noise. I know what it is not. It is not exhaust system, rear latch, speaker grill, power train etc. My noise is in the rear passenger underside of the vehicle.
It sounds like plastic on plastic but is very audible on rough roads and has a sympathetic resonance @3500-4000 RPM.
I think it may be coming from the fuel line pressure relief lines or relief valve but adding deadening foam to these components
has only slightly reduced the noise. Anyone had this?
this forum and see no such similar noise. I know what it is not. It is not exhaust system, rear latch, speaker grill, power train etc. My noise is in the rear passenger underside of the vehicle.
It sounds like plastic on plastic but is very audible on rough roads and has a sympathetic resonance @3500-4000 RPM.
I think it may be coming from the fuel line pressure relief lines or relief valve but adding deadening foam to these components
has only slightly reduced the noise. Anyone had this?
