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Help with 90 HP Merc Inline 6 Cyl. #5103929 07/18/10 11:22 PM
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Lga043 Offline OP
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Last nite I went fishing for a while, started off pretty good, then I started running the motor slow, I noticed the motor started missing like I had plugs fowled, I stopped the motor to try to catch some shad, then when I tried to start it back up it wouldn't start, after it set about 30 minutes it started but was missing bad, I putted around a while trying to get the plugs to burn off, it would hit every now and then like it wanted to streighten out, but it didn't ever fire on all cylinders, finally it ran out of gas and just quit, I changed tanks and it never acted like it tried to fire,

This morning I bought new plugs and headed to the lake, I expected everything to be ok, well, it wasn't and I don't think it is firing, is there some way I can find out if the power pac is bad, or does it even have one? It is a 1985 90 HP!!!

Last edited by Lga043; 07/18/10 11:25 PM.


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Re: Help with 90 HP Merc Inline 6 Cyl. [Re: Lga043] #5103955 07/18/10 11:31 PM
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lakeman Offline
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First thing i'd do is to hook some ear muff's
to it from a water hose and have someone spin
the motor for me and check to see if any of
the cylinders are fireing at all.

Re: Help with 90 HP Merc Inline 6 Cyl. [Re: lakeman] #5103966 07/18/10 11:34 PM
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Lga043 Offline OP
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thanks



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Re: Help with 90 HP Merc Inline 6 Cyl. [Re: Lga043] #5103991 07/18/10 11:46 PM
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Lga043 Offline OP
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Ok I just went out and took a test light, hooked the clips up to the ground on the batery, unhooked one spark plug wire at a time and inserted the probe of the test light inside the end of the spark plug wire and turned the motor with the key, it did not light up the test light on any cylenders!!!



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Re: Help with 90 HP Merc Inline 6 Cyl. [Re: Lga043] #5113164 07/21/10 01:16 PM
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curtis_catfish_73 Offline
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It is easier to see a spark if you unplug the wire, remove the spark plug and place it in the plugwire. Then just touch the bottom thread of the plug to metal and just watch for spark. While you turn the motor over with the key ! I've had #1,3,5, cylinders not fire before but not all of them. If you get spark move to the next cylinder. Until you know what cylinders aren't firing !


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