Hi guys im a newbie this is my first thread on here so hope someone can help. Ive got an 2002 ctr ive had it for 2 years now and its been great never had any problems with it untill now. When i first start it up from cold all year round the engine displays no signs of anything being wrong it idles fine sounds fine and runs like a dream. That is untill winter comes as soon as the temp outside drops there is a really loud strange noise from the engine!! Ive had alot of experience with cars over the yrs so have a good understanding of problems but ive never heard anything like this before its not a knocking sound or a valve or injector noise it like a rattle with a kind of electricity crackle to it if you know wot i mean its hard to explain. After a couple of minutes it goes away then its fine. The strangest thing is if i leave the car untill the sun comes up in the day and the ambiant temp outside rises then start the car it wont do it????? and as soon as the winter goes and the spring/summer comes along its fine again untill the next winter weird?? Hope someone can help as the noise is very loud and i fear it might be doing some damage or something or though the car is running great and flying as normal. The cars done 90,000 miles if that helps.