GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check to see if the turning tubes and/or the baffles in the muffler are dislodged.

Are the turning tubes and/or the baffles in the muffler dislodged?

--

Go to Step 2

Go to Step 3

2

Replace the muffler.

Is there a loss of engine power and/or internal rattles in the muffler or catalytic converters?

--

Go to Step 3

System OK

3

Check the catalytic converter and/or the exhaust pipe for cracked or melted substrate.

Is there cracked or melted substrate in the catalytic converter or the exhaust pipe?

--

Go to Step 4

--

4

Replace the catalytic converter or the exhaust pipe.

Is there a loss of engine power and/or internal rattles in the muffler or catalytic converters?

--

--

System OK