The lifters will make a tapping noise. When you say a cricket sound, it sounds like the serp belt is making noise. Try this. Take a glass of water, start the car, open the hood and slowly pour the water on the belt. Does the cricket sound change? If so, replace the belt. NOTE: Make sure to protect your eyes and wear old clothes because the water will most likely spray back at you.
Let me know. Also, the knocking sound. Is it coming from the lower area of the engine?
Monday, October 5th, 2009 AT 11:18 AM