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1998 Ford F-150 Question: how to locate #4 cylinder

 

Question

stormdancing, 5.4L V8, Terrell, TX, December 05, 2011, 00:52
 Rookie

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

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  • Answer #1

    csubak30 December 05, 2011, 09:44
    Profile_thumbnail
     Master

    hope this helps http://i469.photobucket.com/albums/rr60/klcdrive/78152984...
    Order is : 13726548 Passenger side front to back is 1234 Driver side front to back is 5678

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    stormdancing, December 05, 2011, 11:36
     Rookie

    i changed the #4 plug and boot but it made no diffrence .should i change the coil pack?????
    i realy need suggestions

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  • Answer #2

    euromech December 05, 2011, 12:50
     Journeyman

    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.

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    PARTS GUY, December 05, 2011, 18:38
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     Master

    It's not a fuel injector. It's a bad coil. Let us not make this a doom and gloom problem.

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    euromech, December 06, 2011, 02:33
     Journeyman

    Sorry but i am thinking as a mechanic and i assumed that you checked #4 cylinder for spark before assembly.

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