what would cause no fire to cylinder 4 to my nissan altima 2.5L engine? on 2005 Nissan Altima

I have replace both crank and cam position sensors,placed injectors, replaced spark plugs, and swap coils and I still have no fire to cylinder #4.

by in Eagle Pass, TX on July 28, 2012
2 answers
ANSWER by , July 28, 2012
poss computer issues do you have any other code than po304. you may need to seek diag on this
ANSWER by , July 28, 2012
Have you checked for ignition fire with a spark tester hooked to the coil to see that there is no spark? How much comperssion on #4? Injector pulse ok when checked with noid light? Coil feed circuit&connector ok?