Initial Inspection and Diagnostic Overview

VISUAL INSPECTION
Inspect Catalytic converter for external cracks. Repair or replace as necessary.

BACK PRESSURE CHECK
If excessive exhaust back pressure is suspected, eliminate the exhaust system as a cause. If exhaust back pressure remains excessive with all mufflers disconnected, the catalytic converter may be plugged.

LOOSE CORE CHECK
If the exhaust system rattles during engine operation, check the catalytic converter for a loose core.

With the vehicle raised (for access), tap the catalytic converter with a rubber mallet. If the converter rattles, the core is loose and the converter must be replaced.