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2005 Dodge Neon Question: Misfire codes po302 and po304

 

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mike Liz, Appomattox, VA, January 22, 2013, 08:39
 Rookie

Hi guys, I have a misfire code on #2 it went away while doing a (running)compression test. Now I only have an open injector curcuit code on #4. Just woundering how can a misfire code dissapear on #2 while doing a compression test on it?

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  • Answer #1

    Greg's Orange Auto (13991 Answers) , Orange, CA - (714) 361-9386
    globalhelper January 22, 2013, 13:00
     Master

    could be a cracked plug or maybe it was also a bad connection at plug

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    mike Liz, January 22, 2013, 17:06
     Rookie

    How can a misfire code disappear on #2 while doing a compression test on it? Now I have a #4 open injector code? I swapped over spark plugs, wires and injectors. cleared codes each time codes didn't follow. New o2 and coil, code didn't go away until compression test. Has 100,000 miles and a new timing belt 1 month ago.

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  • Answer #2

    January 23, 2013, 04:19
     Master

    When doing compression test , did you check dry and then check after adding some oil to cylinder? Also , what are the comp. readings for all cyl. dry/wet?

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    mike Liz, January 23, 2013, 11:17
     Rookie

    I only dry tested it. The readings matched for cylinder 1 and 2. That's when I had a missfire on 2. The missfire code is no longer there....for now.

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