Restricted Exhaust. Cadillac Concours 1997

For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Inspect the exhaust pipe. Is the exhaust pipe "kinked?" | -- | Go to Step 2 | Go to Step 3
2 | Repair or replace the tailpipe, as needed. Is the exhaust system restricted with excessive back pressure? | -- | Go to Step 3 | System OK
3 | Inspect the muffler. Is there a restriction in the muffler? | -- | Go to Step 4 | Go to Step 5

4

1. Remove the muffler.
2. Visually inspect the muffler.
3. If a muffler restriction exists, replace the muffler.

Is the exhaust system restricted with excessive back pressure?

--

Go to Step 5

System OK

5 | Inspect the end of the tailpipe. Is there an obstruction in the tailpipe, or is the tailpipe crimped? | -- | Go to Step 6 | Go to Step 7

6

1. Remove the obstruction in the tailpipe, or striaighten the crimped tailpipe outlet.
2. If the tailpipe is damaged, replace the muffler/tailpipe assembly.

Is the exhaust system restricted with excessive back pressure?

--

Go to Step 7

System OK

7 | Inspect the three way + oxidation catalytic converter. Is the three way + oxidation catalytic converter plugged? | -- | Go to Step 8 | --
8 | Refer to Engine Controls (Section 6E), in order to diagnose the cause of the restriction. Is the exhaust system restricted with excessive back pressure? | -- | -- | System OK