Three-way catalytic converter

Three-way catalytic converter  - Specifications - Volvo XC90 Owners Manual - Volvo XC90

Three-way catalytic converter - general information

Х Keep your engine properly tuned. Certain engine malfunctions, particularly involving the electrical, fuel or distributor ignition systems, may cause unusually high threeway catalytic converter temperatures. Do not continue to operate your vehicle if you detect engine misfire, noticeable loss of power or other unusual operating conditions, such as engine overheating or backfiring.

A properly tuned engine will help avoid malfunctions that could damage the three-way catalytic converter.
Х Do not park your vehicle over combustible materials, such as grass or leaves, which can come into contact with the hot exhaust system and cause such materials to ignite under certain wind and weather conditions.
Х Excessive starter cranking (in excess of one minute), or an intermittently firing or flooded engine can cause three-way catalytic converter or exhaust system overheating.
Х Remember that tampering or unauthorized modifications to the engine, the Electronic Control Module, or the vehicle may be illegal and can cause three-way catalytic converter or exhaust system overheating. This includes: altering fuel injection settings or components, altering emission system components or location, or removing components, and/the repeated use of leaded fuel.

NOTE
Unleaded fuel is required for vehicles with three-way catalytic converters.

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