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Old 11-09-2015, 11:44 AM
the D the D is offline
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Join Date: Oct 2015
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How long overdue is the ignition system for maintenance? Plugs, cap, & rotor should be replaced ~30k miles and wires, leads, & coil should be replaced every 100k miles (I think this is the interval).

Just to diagnose, you should remove the cap and inspect inside. There shouldn't be any, or very little, green corrosion inside. If you have definitely traced the misfire to cyl 1 you could swap ignition wire/lead/plug #1 with cyl 4 or 5. If the misfire moves with it, you have a problem with the wire/lead/plug. It's probably time for a total ignition overhaul if that's the case.

Other common problems with the cis m104 are injectors and ignition module but first you should rule out the ignition system
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