Engine Makes a Knocking Sound?

Answer

When the engine makes knocking noise it could be due to the main bearings or rod bearings. In this case, you should not use the car while waiting for the knocking engine noise to be completely and correctly tested, analyzed and fixed.
Q&A Related to "Engine Makes a Knocking Sound?"
Knocking as opposed to pinging or ticking, usually means seriously worn bearings of some sort. Time for an overhaul.
http://wiki.answers.com/Q/What_causes_an_engine_to...
Many older gas furnaces have a pilot light that ignites a flame to produce heat. Some modern furnaces have a thermocouple that performs a similar function. The pilot light usually
http://www.ehow.com/info_11383939_causes-furnace-m...
The causes of a knocking sound could be a design flaw, or is derived
http://www.chacha.com/question/what-causes-an-engi...
(Loud metallic knocking) big ends worn. you could try fitting new bearings to the big ends.
http://answers.yahoo.com/question/index?qid=201110...
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