Tracker 4x2 L4-1590cc 1.6L (1991)
Catalytic Converter: Description and Operation
Three Way Converter Cutaway
The purpose of the three-way catalytic converter is to neutralize carbon monoxide, hydrocarbons and oxides of nitrogen in the exhaust gases leaving the
engine. This is achieved by converting carbon monoxide and hydrocarbons to carbon dioxide and water. Also, oxides of nitrogen are converted to
nitrogen and water. This chemical conversion is caused by the platinum/rhodium metals in the catalytic converter. The noble metal content is about two
grams of platinum/rhodium.
The effective conversion of pollutants begins at an operating temperature of about 250°C (450°F). The ideal operating temperature is 400°C-800°C (750
°F-1500°F). Engine malfunctions, for example misfires, can cause the temperature of the converter to increase to more than 1400°C (2500°F). Such
temperatures lead to the complete destruction of the converter through the melting of the substrate material.
Using leaded fuel will damage the converter and quickly render it ineffective, by coating the noble metals with lead deposits.
Fillpipe Restrictor
FILLPIPE RESTRICTOR
To help prevent refueling with leaded gasoline, the fuel filler neck on this vehicle has a built-in restrictor and deflector. The opening in the restricter will
only admit the smaller unleaded gas nozzle spout, which must be fully inserted to bypass the deflector. Attempted refueling with a leaded gas nozzle will
result in gasoline splashing back out of the filler neck.
