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Unread 09-02-2013, 02:17 PM   #1
booboowv77
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Hedgesville, WV
Posts: 286
4.2 Random tap from motor

As the title says 4.2 has a random tab not specific to RPMS sounds like it is coming from the top center of motor. Number 3 plug is black the rest all seem fine, and the compression test all came up equal on all cylinders. I am going to tear in to figuring it out this week I just wanted to see where everyone thought I should start.

Thanks

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Unread 09-02-2013, 03:04 PM   #2
jimsahm
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Plug wire... Distributor not firing.... If compression is good... Most likely electrical...

Jim
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Unread 09-02-2013, 03:09 PM   #3
booboowv77
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New coil and module in hei distributor, cap less than 6 months old I will check the wires.
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Unread 09-03-2013, 01:11 PM   #4
booboowv77
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Thanks Jim I really fill stupid I have ran it around all day with know tapping. When I want out yesterday and looked Plug wire 3 was so tight from the recent timing adjustment it was all but popping off so I switched wires 2 - 3 and seems to be fine. Thanks again!
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Unread 09-03-2013, 02:56 PM   #5
jimsahm
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You are most welcome.... Glad it was easy!
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