[ds968]

Really old thread but thought I’d post this, to dispel the internet myths about the alleged downsides of letting your car idle ; as in catalytic converter damage, and / or gas seeping into the engine oil, etc..  since I do this all the time with my 968 which hardly sees a drive once every few months , for over eight years now when it was replaced by another daily driver  ..

 

Cars are not loading up with fuel at idle..The EPA would never allow that...When you start a car it is trying to get into closed loop were it reads the 02 sensors and fire off the catalytic as fast as possible...That is the least emissions and is very BIG deal to the EPA because this is when a car pollutes a lot...The fuel / air injection system helps fire off the catalytic...Once it is warm idling the engine PCM keeps the mixture near perfect..If it loaded up then the exhaust would smell like rotten eggs...

Different story with really old cars which had carburetors and prior to the enacted EPA standards, and with “primitive“ exhaust systems and sensors to match.   

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