There are a couple of basic tests and procedures that a lot of people skip over when trying to troubleshoot a Mercury Optimax. Here is a short video that goes over the basics which should get you pointed in the right direction.
Starting with splitting the chaps to make life so much easier, then doing a spark and compression test. Optimax’s are known for failing coils. So a spark test will show you if this is one of the problems.
CERTAIN OLDER OPTIMAX’S HAVE COILS THAT CAN SHORT OUT EXPENSIVE ELECTRONIC PARTS! MAKE SURE YOU KNOW WHAT OPTIMAX YOU ARE WORKING ON BEFORE SWAPPING AROUND PARTS WITH ANOTHER ENGINE!
Checking the air and fuel pressure on an Optimax next is super important to properly diagnosing the issue. If the air pressure is not where it should be the fuel pressure will not build either.
Sometimes people can chase fuel pressure without even fixing the air pressure and waste many hours fixing something that wasn’t broken.
Most Opti’s require 90 PSI fuel and 80 PSI air. If these pressures are off, then start with the air pressure and check the compressor by clamping off the air dump hose on the PORT fuel rail. The pressure should spike, then check the fuel as well.
These tests can get you up and running way faster then anything else. Usually a spark plug, ignition coil, or some dirty fuel filters are what the problem is with an Optimax!
****Disclaimer**** This video is just a visual aid for locations and parts of a normal service.
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