I've not done any outboard diagnostics before, so bear with me. This problem is random enough that it didn't occur in 2 trips to a local shop, so here I am :>)
Symptoms: Cuts out on #1 and #3 cylinders simultaneously. Verified absence of spark with inline tester.
This happens on a somewhat random basis,but the most common circumstance is that the motor cold starts normally, I run up the lake for about a half mile or so, sometimes at fast idle, sometimes part of the way on plane. I stop down (fishing) for 30 minutes or so. Start up again and, after a couple minutes, either at fast idle or on plane, the two cylinders drop out. The cutting out happens instantly, with no gradual or hit and miss transition. If I let it idle on one cylinder for a while, it will almost always go back to normal in a few minutes.
The description above is the most common, but there have been times when I used the boat all morning with no malfunction at all, and there's other times when it starts cold on one cylinder, and it may take a number of minutes to come out of it.
I tried doing the procedure on page 154 of the CDI Electronics Troubleshooting Guide
for 90 HP 3 cyl (1985-1991) 2nd picture attached
Testing power pack 688-85540-15-00/688-85540-16-00 1st attached pic
I ran through CDI's checklist as best I could and first checked resistance, engine off. Everything checked out to the OEM readings except the white/green trigger to ground was not open as spec'd. It showed about 25 ohms. With the engine running, this terminal to ground showed zero voltage rather than the 2.5v minimum per the specs.
With the engine running normally, the three black/white terminals for the coils showed about 199 volts
With the engine running cutting out, #2 showed 199 volts, with #1 and #3 showing zero volts as would be expected.
The powerpack is suspect, of course, but I'm wondering if the trigger is also malfunctioning or even the primary/only cause of the problem. Any ideas would be appreciated. .
Symptoms: Cuts out on #1 and #3 cylinders simultaneously. Verified absence of spark with inline tester.
This happens on a somewhat random basis,but the most common circumstance is that the motor cold starts normally, I run up the lake for about a half mile or so, sometimes at fast idle, sometimes part of the way on plane. I stop down (fishing) for 30 minutes or so. Start up again and, after a couple minutes, either at fast idle or on plane, the two cylinders drop out. The cutting out happens instantly, with no gradual or hit and miss transition. If I let it idle on one cylinder for a while, it will almost always go back to normal in a few minutes.
The description above is the most common, but there have been times when I used the boat all morning with no malfunction at all, and there's other times when it starts cold on one cylinder, and it may take a number of minutes to come out of it.
I tried doing the procedure on page 154 of the CDI Electronics Troubleshooting Guide
for 90 HP 3 cyl (1985-1991) 2nd picture attached
Testing power pack 688-85540-15-00/688-85540-16-00 1st attached pic
I ran through CDI's checklist as best I could and first checked resistance, engine off. Everything checked out to the OEM readings except the white/green trigger to ground was not open as spec'd. It showed about 25 ohms. With the engine running, this terminal to ground showed zero voltage rather than the 2.5v minimum per the specs.
With the engine running normally, the three black/white terminals for the coils showed about 199 volts
With the engine running cutting out, #2 showed 199 volts, with #1 and #3 showing zero volts as would be expected.
The powerpack is suspect, of course, but I'm wondering if the trigger is also malfunctioning or even the primary/only cause of the problem. Any ideas would be appreciated. .
