Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Exhaust System Diagnostic Chart

Complaint/Condition Chart:






IMPORTANT: The muffler should move in the isolator block a minimum of 1.60 mm (1/16 in.) vertically and 3 mm (1/8 in.) horizontally to prevent vibrations from being transmitted into the vehicle's body.


IMPORTANT: When a catalytic converter's catalyst failed, pieces of the converter can become lodged in the muffler causing poor acceleration/hesitation. A plugged catalytic converter can also cause the engine not to start when exhaust flow is completely blocked.