Gasoline engines
Refuel with unleaded gasoline only.
When refitting the catalytic converter, refuel at least 2 times with unleaded fuel before installing the catalytic converter. In addition, on engines that require supergas, the ignition should be set to a later one, since unleaded supergas has an octane rating of only 95. How many degrees to change the ignition depends on the model.
Do not start a hot engine by towing or "with a push". Unburned fuel, if ignited in the catalyst, would cause it to overheat. When the battery is dead, start the engine from the battery of another car.
If a misfire occurs before the cause is determined, remove the main injection relay or fuel pump relay connector. This prevents fuel injection when starting the engine. The fuel pump relay is located in the relay box on the left side of the engine compartment.
Do not test for spark with spark plug tips removed.
Cannot compare cylinders (balance test) by turning off the ignition of one of the cylinders. When the ignition of one of the cylinders is turned off - even with the help of an engine tester - unburned fuel enters the catalyst.
In the event of ignition failures, avoid running the engine at high speeds and repair the fault immediately.
Install only spark plugs recommended for vehicles with a catalytic converter.
Gasoline and diesel engines
Do not park your vehicle on dry grass or leaves. The muffler is very hot in the area of the catalytic converter and continues to radiate heat even after the engine has stopped.