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Old 12-20-2013, 11:27 AM   #1
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Join Date: Dec 2013
Fan#: 129234
Location: Pearland, TX
What I Drive: 2003 Blue ZX5

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Testing spark plug wires issue

I'm currently troubleshooting a vibration at idle issue with my 03 focus (turned out to be a collapsed pcv hose but that's a different post).

While testing spark, I used my timing light w/ tach and noticed something strange on the #1 wire. (I adjusted for wasted spark). On #2, #3, and #4 at warm idle, the tach showed ~460rpm. On #1 it showed ~900. Weird. So I ran the test again near the coil and all cylinders show ~460. Except, when I run the pickup down the #1 wire, about halfway it jumps to 700 and at the end jumps to 900.

Am I looking at a defective wire? Or could something else be going on?

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