It helps to warm the engine before you start it. If you can't find anything else hold the engine under the exhaust pipe of your car while it's running. When we do our New Year's Day Chilly Fly we have a big propane heater in our shelter. The guys that had cranky engines took them in there and held the engines up to the heat before they tried to start them. Works like a charm. Makes it a lot easier to get the engine started up in cold weather. In between flights wrap the engine with a rag or something else to insulate it and keep it from getting too cold, it will help when you get ready to start it up again.

Ken