I am new to the acura scene. I just purchased a 99 gs with only 18,000 miles on the car. I discovered when I start the car when the engine is cold, there is a metallic buzzing noise coming from I think on the right side of the engine. It only last the most about 10-15 secs. and it goes away. At first, I thought it was the heat shield, but the shield was found to be tight. I am at a lost. All functions on the car are normal. Is this normal for an Integra????