hi to all , i have a jaguar xkr 2007 "X150" 60 000 miles, a month now when the car is cold and i start it, there is a strange noise coming from the engine for 2-3 seconds. if i start it again in the next 4-5 hours no noise come. at the official garage they told me to open the engine and see what is the problem, might be the chain tensioner. anybody had same problem or an idea about my car problem ? any help will be very appreciated. regards d