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"New" 15hp 2010 Mercury intermittently runs great, then the next second, rough.
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<blockquote data-quote="turbotodd" data-source="post: 468877" data-attributes="member: 7376"><p>Water pump "peeing" ok? On muffs, the hose pressure is forcing water into the system and you don't get a good idea of the pump's condition. Then when actually on the water, where the pump has to pull water from the lake and force it into the engine, if the pump output is low, the engine can run warm. Some engines have a limiter built into the EFI and/or ignition system such that when the temp gets to the programmed threshold, it will cut ignition, effectively reducing the engine output. This is done to let you know that it's got a problem. Iv'e seen the sensors die and cause it too, but being that it's a motor that doesn't sound like it's been used much, I'd for sure check the impeller if you haven't already. Also look at the cup and plate while the pump is apart. When they sit a while, the impeller tends to develop a memory and one or more vanes may be "stuck bent".</p></blockquote><p></p>
[QUOTE="turbotodd, post: 468877, member: 7376"] Water pump "peeing" ok? On muffs, the hose pressure is forcing water into the system and you don't get a good idea of the pump's condition. Then when actually on the water, where the pump has to pull water from the lake and force it into the engine, if the pump output is low, the engine can run warm. Some engines have a limiter built into the EFI and/or ignition system such that when the temp gets to the programmed threshold, it will cut ignition, effectively reducing the engine output. This is done to let you know that it's got a problem. Iv'e seen the sensors die and cause it too, but being that it's a motor that doesn't sound like it's been used much, I'd for sure check the impeller if you haven't already. Also look at the cup and plate while the pump is apart. When they sit a while, the impeller tends to develop a memory and one or more vanes may be "stuck bent". [/QUOTE]
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"New" 15hp 2010 Mercury intermittently runs great, then the next second, rough.
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