i have a 96 cavi 2.2l timing chain replaced about 7000 mileas ago so the previous owner says. when engine is cold and its cold outside timing chain makes noise the whole time the car is on when its warm outside 60 degerees or more no noise until the engine is warm its been doing this since i bought it and am trying to understand what would be making it do this and why temp outside makes a difference. ive tried thicker oil and 5w30 now i have synthetic 10w30 and it still does it please give me ideas on what would cause this to change with temp. thanks guys