Quote:
Originally Posted by FRSBRZGT86FAN
That literally is not how it works, the cat stays cold it takes quite some time for it to warm up, so much so any unburnt fuel will ignite in the exhaust regardless by that time or just get sent into the atmosphere, if it does nothing dangerous will happen it's contained. People are actively creating tunes to do this by retarding ignition timing off throttle to get there exhausts to crackle and pop.
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It would be interesting to know what is the rationale behind owner manuals discouraging push-starts.