For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: Exhaust system performance complaints, such as excessive back pressure or exhaust muffler rattle, are noticeable by their effect on engine performance. Other faulty vehicle components, such as emission control devices, have similar effects on engine performance and are characterized by the same symptoms. For further information, refer to Lack of Power, Sluggishness, or Sponginess in Engine Controls - 3.4L.
1 | Remove the muffler. Visually inspect the muffler. Is there a restriction in the muffler? | -- | Go to Step 2 | Go to Step 3
2 | Replace the muffler. Refer to Muffler Replacement . Does the vehicle still have a loss of power and/or internal rattles? | -- | Go to Step 3 | System OK
3 | Inspect the catalytic converter. Do you see any of the broken catalytic converter internal honeycomb material in the muffler/exhaust pipe? | -- | Go to Step 4 | Go to Restricted Exhaust System Check in Engine Controls - 3.4L.
4 | Replace the catalytic converter. Refer to Muffler Replacement . Does the vehicle still have a loss of power and/or internal rattles? | -- | Go to Step 1 | System OK