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P0303 On a specific cylinder misfire -you have replaced sparkplug and injector for no.3 Now check the compression for no.3 both dry and wet tests
Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Thursday, January 7th, 2010 AT 2:09 AM