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    Merceuiser 4.3 MPI Questions

    Good morning everyone! We have a 2013 Tahoe Q5 which has the 4.3 MPI ECT engine in it and really have had nothing but problems with it from the start. All the problems revolved around the water pressure reading either too low and then eventually too high and setting a code in Guardian, according...
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    More 4.3 MPI Water Pressure Issues... Possible to bypass the sensor???

    Over the last few months I have made several posts about the problems we have been having with our newer 2013 4.3 MPI throwing a false “Low Sea Pump Pressure” code and sending the engine into Guardian mode. We have been back and forth to the shop (under warranty) and it seems that Mercruiser...
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    Mercruiser 4.3 MPI with More Issues

    Last month I posted about my 2013 4.3 MPI losing power and throwing an alarm which was one of the "long-beep" alarms which ended up being the code for Low Water Pressure from the Sea Pump. The motor consequently went into Guardian mode and is why the RPMS were limited to 1200 or so. I bring...
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    Mercruiser 4.3 MPI stalling and running rough...

    Good afternoon all, just ran into a problem this morning with our 2013 Tahoe with the Mercruiser 4.3 MPI. We took off from the launch no problem and ran perfect for around 30 minutes or so ranging from WOT to slow running, all without the slightest glitch or hiccup. We pulled up to the beach...
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    Need New Prop for 2012 Tahoe Q5i SF

    Good morning everyone, I am looking for a new prop for my '12 Tahoe Q5i SF with the 4.3L MPI 220 HP Mercruiser with the Alpha I Gen II outdrive . I am pretty sure the final drive ratio is the 1.62 and the prop from the factory is the 21p aluminum. With the factory prop, the holeshot is...
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    New 2013 Q5i owner with questions...

    Good morning everyone! We just recently picked up our new Q5 and Love the boat so far but we have a few questions. First off let me preface the questions with some information. I have been running boats all my life and this is my third boat to own. All the previous boats were aluminum boats...
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    Yamaha F115 TPS plug

    Took the boat out this weekend for a full day of fishing in South Louisiana. When we put in, the motor cranked up quick and idled real good. When we went to take off though, it seemed as though the motor didn't quite have the power it normally has. It took it a little longer to come up to top...
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    battery isolator on 2005 F115

    I think I read a post a few days ago by rodbolt that said all of the F series yamaha motors sold in the US had a battery isolator built onto the motor for charging house batteries. Am I remembering right or am I mistaken? I have a '05 F115 but don't remember seeing one off hand. I wasn't exactly...
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    Yamaha F115 Throttle Box (703) Problems

    I have a 2005 F115 which is running great. The only problem I have right now is not with the motor itself but with the throttle box (703). The problem I am having is that the "high idle" lever (the small lever you can lift to increase engine speed without being in gear) raises almost all the way...
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    VST Filter on '05 F115

    I do not yet have a service manual for this motor. I am planning on ordering one this fall. I am having a little problem with sluggish throttle response and low top end rpms and want to check the VST filter on this motor. First of all I am new to outboard motors. I think I see the VST on my...
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    2005 F115 Yamaha Not Turning Up All the Way

    What would make an F115 not turn up all the way on the rpms? A little more than a year ago, the boat would turn up to about 5600 rpms with a given load. Now, with the same load, it will only turn up to about 5200-5300 rpms and subsequently I have lost a little top end. I stored the boat over...
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    A question for You Yamaha Pros out there...

    I have a 2005 F115 on the back of a 18'3" aluminum bass boat which has a high performance hull and pad underneath it. The motor is turning a 13x19 SS prop. I was looking through the internet and found a slip calculator for props so I plugged in my engine rpms per the in dash tach (5850), gear...
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    Using Sea Foam as sole fuel stabilizer???

    I am a firm believer in Sea Foam as a cleaning and de-carbing agent. I have used it in everything I own to get it running right again when it seems to have lost a little something. I use it pretty often in my truck and wife's car and just recently used it in my son's four wheeler when it...
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    Question about prop size and speed!!

    I have an 18'6" Xpress aluminum bass boat with an f115 on the back with a PowerTech 13x19 prop. I have installed Mobster Tabs to fix a porpoising problem I had (which worked beautifully) and was just plinking around on the net looking at boat topics and came across a prop pitch calculator. It is...
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    What type of trolling motor is better?

    In your own opinion, which type of trolling motor is better, the remote steering or the hand control models. I am looking at getting a bigger trolling motor for my boat since I think the 44# thrust motorguide I have is just a little to small for my 18'6" aluminum bass boat. I am looking into a...
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    To Fix or Not to Fix?

    The other day while running the boat trying to fine tune the Mobster Tabs, I nosed the boat into the bank so that I could go and back the trailer down the ramp (I was by myself). When I nosed into the bank, I noticed it bumped pretty hard. After trailering the boat and getting back home, I...
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    '05 Yamaha F115 Speedo Problem

    I have an '05 F115 whose pickup for the speedometer seems to be messed up some how. I was running the boat after installing the Mobster Tabs and was comparing the speedo to the gps speeds and noticed that the speedo stopped registering about halfway through our outing. When I first noticed it...
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    Mobster Tabs Installed and now for the results!!

    I purchased the Mobster Tabs from this site and put them on yesterday. Today, I took the boat out for the first "tabbed" run and even though I think I need to lower the pressure a bit, I was very satisfied with the results. I say I have to adjust the pressure because when running wide open, I am...
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    Oil Leak on 2005 F115

    Today while installing my Mobster Tabs on my boat, I noticed some oil leaking just above the plate just above the anti-ventilation plate. If I am not mistaken, this is where the lower unit and the rest of the motor come together. In the back of the motor right above this "plate" there is a...
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    Sealing A Screw Hole in Transom

    I have an 18.5' aluminum bass boat which I am fixing to install Mobster tabs on and I have a little problem. Right where I need to mount the tabs, as instructed by NautiJohn, is where the mounting bracket for my depth finder's transducer is mounted. It is mounted with two sheet-metal screws with...
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