GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check for leaks at the pipe joints.

Are the joints leaking?

--

Go to Step 2

Go to Step 3

2

Tighten the U-bolt nuts at the leaking joints.

Refer to Fastener Tightening Specifications .

Has the leakage stopped?

--

System OK

Go to Step 3

3

Check for gaskets that are damaged or improperly installed.

Are there damaged or misaligned gaskets?

--

Go to Step 4

Go to Step 5

4

  1. Replace damaged gaskets.
  2. Align the connections.
  3. Tighten the connections. Refer to Fastener Tightening Specifications .

Has the leakage stopped?

--

System OK

Go to Step 5

5

Check for loose exhaust flange connections.

Are the flange connections loose?

--

Go to Step 6

Go to Step 7

6

Tighten the stud nuts or bolts to specifications. Refer to Fastener Tightening Specifications .

Has the leakage stopped?

--

System OK

Go to Step 7

7

Check for burned or corroded exhaust pipes.

Are the exhaust pipes burned or corroded?

--

Go to Step 8

Go to Step 9

8

Replace the exhaust pipes, as required. Refer to General Exhaust System Replacement .

Has the leakage stopped?

--

System OK

Go to Step 9

9

Check for leaks at the manifold.

Are there leaks at the manifold?

--

Go to Step 10

System OK

10

  1. Tighten the bolts to specifications.
  2. Replace the maniifold as necessary. Refer to Exhaust Manifold Replacement .

Has the leakage stopped?

--

System OK

--