Engine noise suggests a problem has developed that will worsen over time. Unlike a catalytic converter that fails suddenly, pinging, knocking, and clicking sounds tend to slowly build in intensity. If the root causes are addressed during the early stages, they can often be resolved without extensive repairs. On the other hand, if you allow them to persist, you risk exposing your engine to severe - and expensive - damage.

In this article, I'll describe the most common forms of engine noise and explain what causes them. We'll take a look at clicking, knocking, pinging, and detonation. If you notice any of the following noises coming from your engine, have the underlying problems fixed quickly. Otherwise, you may unwittingly set the stage for a costly overhaul.

Oil Pressure And Worn Parts

Low oil pressure can cause a clicking noise that grows louder as your rpms rise. The easiest item to check is your oil level. If it's low, replenish it. If low levels persist, check for leaks. If you're unable to find any, have a mechanic check to see whether you're burning oil.

Bearings, Rods, And Deep Knocks

Deep knocking is caused by severely worn or damaged bearings. It is prevalent in older vehicles, especially those in which the owner has neglected to change the oil and filter on a routine basis. The wearing and damage can also be caused by aggressive driving habits, loose bearings, and adjoining rod bolts that have sustained damage.

It is a serious problem; if you hear knocks, have a mechanic resolve it quickly. Your engine will either seize up or one of the rods will break. In both cases, an overhaul or replacement will be necessary.

One option is to simply replace the bearings. But, that is merely a stop-gap measure. Chances are, if the bearings are damaged, a mechanic will need to resurface the crankshaft. That can be expensive.

Pinging And Detonation

Pinging can be caused by overheating, low-quality gas, carbon deposits within the combustion chamber, or a failing EGR valve. The main symptom is an erratic detonation of fuel. Over time, it can lead to severe damage of the head gasket, pistons, and rod bearings.

Each form of engine noise described above may seem relatively benign in the beginning. A subtle clicking, knocking, or pinging might not imply a sense of urgency. They should. These noises will gradually grow more pronounced. As they do, they promise damage for critical parts. If you hear them, take your car to a repair garage and ask a mechanic to fix the underlying problem. With a little luck, you'll avoid an expensive overhaul.

Get car information from Parts and Autos. Also check out www.carpartsforus.com/ for additional info
Article Source: http://EzineArticles.com/?expert=Lawrence_Reaves
Why does my engine knock / make a pinging noise ?

1 - When going up a hill or accelerating I hear pinging from my engine

Solution : Incorrect fuel grade purchased for the engine - consult owners manual for correct fuel grade,

2 - Solution :
Their is a fault or problem in the fuel or electrical system.

4 - Solution : You have installed improper spark plugs for your vehicle - recheck and confirm that they are the correct type for your vehicle.

5 - Solution : You have worn or damaged distributror parts that need replacing - inspect and replace as needed.

6 - Solutions: Faults with emission systems can also cause this problem - check and confirm no problems with connections or inoperable componets.

7 - Solutions : Vacuum leaks from cracked or disconnected vacuum hoses - inspect and replace as neccessary.
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3 - Solution :  The ignition timing is set incorrect or has moved - Reset timing to correct specifications.
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Diagnosing Problems That Trigger Engine Noise
By Lawrence Reaves

Next, look at the pressure gauge. If the pressure is low, the valvetrain parts may react noisily. Low oil pressure may be due to an oil pump that has developed a blockage or become worn, or a filter that has become clogged. If you live in a cold area, valvetrain noise may be partly due to using an oil with a heavy viscosity. Switching to a lighter viscosity may reduce the noise.