1997 Plymouth Neon Highline 2.0 SOHC mileage: 48,235. Right after (my) break-in (aprox. 2200 miles) period I took the car back to the dealer because I thought the engine was a little noisy. They told me that the sounds the engine made were normal. I really was not sure but I do know that different engines make different noises. So, I let it ride. A short time ago, the engine started making a very loud noise intermittently. It only does it below twenty degrees f. And randomly intermittently. When I first start the car it is fine for approximately six to ten seconds, then it makes a noise like a really loose connecting rod bearing for approximately five to ten seconds, then it goes away and may not reoccur for days. Anybody have any ideas?