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More than likely it is due to having aluminum intake (engine). The cold causes the intake to contract, although it will only contract a fraction of an inch, it is enough to allow extra air into the engine. Steel intakes do not constrict as much, but they do have similar problems, though not as pronounced. Without this air going through the air/fuel mixture your combustion chamber will be very lean therefore causing it to run a bit ruff. As soon as a little bit of heat builds it allows the intake to expand sealing off the leak. I have a 325ix and it doesn't like the cold. I also had (many years ago) a Datsun 280zx, with an all aluminum engine, and it too didn't like the cold.

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16y ago

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