For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Check for any kinked exhaust pipes. Are there any kinked exhaust pipes? | -- | Go to Step 2 | Go to Step 3
2 | Repair or replace the exhaust pipe(s) as necessary. Is there still excessive back pressure? | -- | Go to Step 3 | System OK
3 | Remove the exhaust muffler and visually check for restrictions. Are there any restrictions in the exhaust muffler? | -- | Go to Step 4 | Go to Step 5
4 | Replace the exhaust muffler. Refer to Muffler Replacement . Is there still excessive back pressure? | -- | Go to Step 5 | System OK
5 | Check for a crimped tail pipe or an obstruction in the tail pipe. Is the tail pipe crimped or obstructed? | -- | Go to Step 6 | Go to Step 7
6 | Remove the obstruction or straighten the crimp in the tail pipe. If the tail pipe is damaged, replace the muffler/tail pipe assembly. Is the exhaust system still restricted? | -- | Go to Step 7 | System OK
7 | Check for a plugged three way catalytic converter. Is there a plugged three way catalytic converter? | -- | Go to Step 8 | --
8 | To diagnose the cause of the restriction refer to Restricted Exhaust System Check in Engine Controls - 3.4L. Is the exhaust system still restricted? | -- | -- | System OK