Hi, My 99 Blazer has noise in exhaust system? mostly when I let up on
gas at 50-65 mph. Took it to dealer and was told they heard noise and
there were a couple of bulletins from GM on "possible" causes and/or
solutions. One is a $300 shield the other a $167 hangar and there is NO
guarantee either will work. They would not give any other help. I found
3 GM bulletin numbers on exhaust but don't know how to get more info.
from the numbers. If anyone has had this problem or can tell me how to
get an explanation of the bulletin number I would really appreciate your
help. Thanks ,Ray
There are two bulletins that I found for that year. The first one:
Exhaust Boom/Groan Noise in Passenger Compartment (Install Exhaust Bracket
and Dampers to Exhaust System) #02-06-05-002 - (04/30/2002)
Basically, you install a bracket that ties the exhaust system to the rear
trans/t/case mount, and
install a damper weight to the muffler.
Part numbers as follows: By the way, this might come out weird
as the formatting seems to change when you cut and paste this
The other bulletin deals with revised exhaust pipe to manifold seals
reworking the exhaust pipe flanges so that they will apply more clamping
to the exhaust seals.
Exhaust System Rumble/Rattle Noise (Replace Exhaust Pipe Seals and Modify
Exhaust Pipe Ring Flanges) #01-06-05-006 - (11/02/2001)
New seal number is:
You install the new seals, and grind about 1/10 inch off of the
three raised standoffs on each exhaust flange.
I just wanted to say THANKS to those who took the time to respond and
help me out. It is Greatly Appreciated . I have 3 Chevy trucks so I'll
be around , Hopefully one day I can help someone else who may need it.
That's what it's all about. Thanks Again , Ray
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