All of it. The 10 percent figure you occasionally see is nonsense that a lot of people believe just because they've seen it so much.
Quick Answer. Some things that cause a vehicle's front end to make a clunking noise are worn ball joints, a damaged tie rod, broken or loose sway-bar links, hard or damaged shocks, and faulty shock mounts. An automotive professional can inspect the vehicle's front end to locate the source of the clunk. Continue Reading.
intake hose image by Five Arrows from Fotolia.com. When a car backfires, it means that something has stopped working properly in the emission system in the engine. There are a number of things that can cause the improper fuel/air mixture which leaves unburned fuel in the exhaust manifold that may ignite. The sudden explosion of the fuel that was sitting is the cause of the loud sound that is generally referred to as backfiring.