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Hi Paul & Tara, The Idle Air Control (IAC) valves are not your problem. Symptoms of an IAC are stalling at idle, crank and stall, and crank no start. None of the engine alarms/faults will cause the engine to shut down. They may cause the engine to go into "guardian" mode which may limit power...

Hi Bob, Fuel in your oil sample is not unusual. The longer its been since an oil and filter change the more fuel will be in the sample. Oil samples are great but you really need multiple samples over time to detect any trends or abnormalities. That said, the first place to look would be fuel...

Shacks, You're definetly going to want a certified Merc tech take a look at it. Your boat has Generation 1 Axius. If air gets into the hydraulic system while changing the filters it can damage to hydraulic pump. Check your service records or call your local Merc Dealer to check for open...

Hi DDD, The fuel regulator attached on top of your Coolfuel Module does indeed regulate fuel pressure to fuel injectors. The small hose attatched to it is connected to engine manifold vacuum. Engine vacuum corresponds to engine throttle/load/rpm. The regulator allows higher fuel pressure at...

Hi DDD, Mercury Marine engines equipped with Digital Throttle and Shift (DTS) do not have Idle Air Control (IAC) Valves. When you move the throttle levers at the dash, the Command Module at the helm sends a message to the Computer (PCM) on the engine telling it to move the Electronic...

Mercury recomends 25W40 oil meeting NMMA FC-W standards for four-cycle engines. You should have acceptable results with 15W40, 15 weight is a little lower than I would go, but it shouldn't really cause any problems. You may notice slightly lower oil pressures especially when cold, but thats...

The first step is to install the spark plug wires correctly and test run the boat. 12 hours is quite a while to run with the wrong firing order especially under a load. However Mercruiser cast iron blocks and cylinder heads take a lot of abuse before any real damage happens, so don't lose hope...

We use Spader labor time guide, which quotes suggested "flat rate" labor times for particular jobs, however it is far from inclusive, and does not account for any difficulty in accessing the components or overlap in labor times ie replacing manifolds "and" risers "and" elbows etc. A good...

If your distributor cap is flat on top with plug wires on the side, 4 on one side and 5 on the other, then the distributor cap and rotor screws are Torx, a T-20 for the cap and a T-15 for the rotor if memory serves me correctly. Be carefull with the screws as not all of the cap and rotor kits...

Jeff, Your tilt/trim button on the throttle handle on that model year should be a three positon switch. Down is of course down, however up is two stages. A normal press of the button moves it up in the "operating range", the range you can safely trim the drive while the engine is running...