GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the exhaust system.

Is the exhaust pipe kinked or bent anyplace?

--

Go to Step 2

Go To Step 3

2

Replace the exhaust pipe.

Is the exhaust system restricted?

--

Go to Step 3

System OK

3

Inspect the muffler.

Is the muffler restricted?

--

Go to Step 4

Go to Step 5

4

  1. If a restriction is likely, remove the muffler and visually inspect it.
  2. If the damage to the muffler is not repairable, replace the muffler.

Is the exhaust system restricted?

--

Go to Step 5

System OK

5

Inspect the end of the tailpipe.

Is the end of the tailpipe obstructed?

--

Go to Step 6

Go to Step 7

6

Remove the obstruction, or if the end of the tailpipe is crimped, straighten the outlet.

Is the exhaust system restricted?

--

Go to Step 7

System OK

7

Inspect the catalytic converter for obstructions, which may have occured as a result of a serious engine manlfunction.

Is the catalytic converter obstructed?

--

Go to Step 8

--

8

  1. Replace the catalytic converter.
  2. Correct the engine malfunction.

Is the exhaust system restricted?

--

--

System OK