Hey guys I have a problem maybe you all can help out with...
My 2001 Blazer LT is making a strange growling noise. Dealership says it's the muffler (hence my last post) but I'm not so sure...
The noise is most apparent in the following situation. Engine is warmed up and I take it for a spin down the highway. Pull off the highway and come to a stop. Then start accelerating and a sort of a deep, whining growling noise seems to come from the rear of the truck. Sounds sort of like it's coming from the exhaust system, but I can't be certain. It will make this growling for a short while, then progressively get better and stop making the noise. Then it'll start again later on (if I continue driving around). Almost always happens when accelerating from a stop.
I've had the rear end serviced and inspected and everythings ok. Took it to the dealer today, and they told me the "rattle" is comming from my muffler. I think they have not diagnosed the problem because it's not a rattle and it's been making this noise since shortly after I bought the truck (1.5 years and 40,000 KM's). I know there is a small metallic rattle sound that I've also heard on occasion, and maybe that's the rattle they have found, but my growling whine does not sound anything like a rattle. I did take it for a drive with a mechanic and he heard the growl but was unsure about the source.
Any ideas guys? They want me to spend $590 on a new GM muffler since no aftermarket mufflers are available, and I have the GM Total Plus extended warranty (I'm now past the factory warranty) but it doesn't cover mufflers.
Thanks for any info you all can provide!