GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check the exhaust tubing for kinks.

Is the exhaust tubing kinked?

--

Go to Step 2

Go to Step 3

2

Repair the kinks in the exhaust system or replace the exhaust tubing.

Is the exhaust system restricted?

--

Go to Step 3

System OK

3

Check for restrictions within the muffler.

Refer to Restricted Exhaust System Check in Engine Controls.

Are there any restrictions within the muffler?

--

Go to Step 4

Go to Step 5

4

Remove the muffler and examine it.

If the muffler is damaged and cannot be repaired, replace the muffler.

Is the exhaust system restricted?

--

Go to Step 5

System OK

5

Inspect the end of the tailpipe for any obstructions.

Is the exhaust system restricted?

--

Go to Step 6

System OK

6

Remove the obstruction from the end of the tailpipe.

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 restrictions that may have occurred as a result of engine malfunction.

Refer to Restricted Exhaust System Check in Engine Controls.

Is the catalytic converter restricted?

--

Go to Step 8

--

8

Replace the catalytic converter. Refer to Catalytic Converter Replacement .

Correct the engine malfunction.

Is the exhaust system restricted?

--

--

System OK