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Old 04-24-2006, 05:38 PM   #1
zupspoon
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Join Date: Apr 2006
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Default CDM module on 1999 Merc 225 EFI 2-stroke
The motor's running rough at low RPM so I used a digital tach that clamps around the plug wires like a timing light. Five cylinders are showing the correct RPM but #1 cylinder is reading about 30% less rpm, meaning that it's not getting spark all the time(right?). The plug seems ok, so I'm going to get a new module for that cylinder tomorrow. Anyone have a similar problem? Thanks.
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