So the past few days I have been hearing a slight "whine" coming from the exhaust when the truck is running. (Its usually my woman, but oddly enough... this time it is different
) It is like a rhythmic whine that speeds up and increases its noise frequency as the engine Revs. Is this symptoms of a bad cat?
I have a magnaflow SI/DO muffler that has been on about a year with no problems.
When I got under the truck, it sounds to me (I could be wrong) like it is coming from the "canister" right below the driver's seat, I have a 2005. Is this a cat or a resonator? Could this be the correct place the noise is coming from?
For what its worth, I used to have a 95 Silverado with a bad cat but it was more of a clanking or churning sound... But what I am hearing now is more of a high pitched whine.
Any help or advice would be appreciated.