how to locate #4 cylinder on 1998 Ford F-150

got the code po304 but i dont know which is the #4 cylinder. i need advice on how to find it

by in Terrell, TX on December 05, 2011
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2 answers 3 comments
ANSWER by , December 05, 2011
hope this helps Order is : 13726548 Passenger side front to back is 1234 Driver side front to back is 5678
COMMENT by , December 05, 2011
i changed the #4 plug and boot but it made no diffrence .should i change the coil pack????? i realy need suggestions
ANSWER by , December 05, 2011
It could be the #4 fuel injector.I have seen once so bad injector that sprayed so mutch fuel into cylinder that caused a hydrolock that damaged(bent) the connection rod and cylinder lost some compression. Other shop changed all ignition parts and injector but car was still misssing.I checked compression ratio and find low compression in that cylinder.
COMMENT by , December 05, 2011
It's not a fuel injector. It's a bad coil. Let us not make this a doom and gloom problem.
COMMENT by , December 06, 2011
Sorry but i am thinking as a mechanic and i assumed that you checked #4 cylinder for spark before assembly.