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Every owners manual I've ever read (apparently only two people on this thread do that!) warns about CATs and push starting. I've never understood why, but in a modern car, the ECU does 'know' if the engine's bump started or if the key's been used. Theoretically, it could run different mixtures if key started vs bumped. Essentially, a the ECU knows a key start is coming, while a bump start is a surprise.
That said, it's still warned against in cars with carbs and cats.
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