Mercury 1988 20hp One Cylinder Two Intermittently

pl2442

Cadet
Joined
May 1, 2018
Messages
8
All, I need some advice - 1988 Mercury 20 HP tiller.
The issue the engine routinely runs on only 1 cylinder, when going across the lake it will intermittently hit on two for anywhere from 2 seconds to a Minuet, then drop back to only 1 cylinder, there is no pattern to it, some days it will continuously do it and others not once.

PLEASE give me advice what it could be and how to check then component. Im out of ideas. Thanks
 

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
8,293
sounds like the switchbox is failing. www.cdielectronics.com has the troubleshooting guide for your motor. 9 times out of 10 it is the switchbox causing that but testing needs to be done.
 
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