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Rodriguezc51

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Reply with quote  #1 
What's up guys I've read through quite a few post with similar issues however I think I've narrowed it down just need some assurance the engine won't rev past 3k under load if I trim up so the prop is Just barely out of the water it revs no problem no limiter in gear. Trim it down a bit under water and back to 3k rpm only this has to be a fuel issue correct? Fuel pump? Water in fuel? Any thoughts is much appreciated.

2015 e Tec 90
E90dslafa
rickmcd53

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Reply with quote  #2 
Was this a recent change? Anything done to engine since it did rev before?
Glenlivet

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Posts: 52
Reply with quote  #3 
Quote:
Originally Posted by Rodriguezc51
What's up guys I've read through quite a few post with similar issues however I think I've narrowed it down just need some assurance the engine won't rev past 3k under load if I trim up so the prop is Just barely out of the water it revs no problem no limiter in gear. Trim it down a bit under water and back to 3k rpm only this has to be a fuel issue correct? Fuel pump? Water in fuel? Any thoughts is much appreciated.

2015 e Tec 90
E90dslafa

Mine wouldn’t rev above 3500rpm. Turned out the exhaust innards were burnt outl,

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Rodriguezc51

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Posts: 14
Reply with quote  #4 
Nothing has been changed on the motor happen on the way home left a spot and just wouldn't rev past 3000.
PhilH12

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Reply with quote  #5 
Most likely(?) need to drop the LU and check the inner exhaust housings and gaskets.  Also, confirm that you're not over-propped or running the motor too low.  Need to see your motor's Optimum rpm's at WOT, even though you may not run WOT very often.  If you don't check, it will just happen again - if that's what happened here.

Phil

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20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Rodriguezc51

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Reply with quote  #6 
Glenlivet that sounds interesting exhaust innards? I saw a video of clogged exhaust tube causing similar problem? Is that what you mean?
PhilH12

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Reply with quote  #7 
Don't believe that they've changed much (yours is newer than mine), and if you drop the lower unit, there are 2 plastic exhaust housings up inside there connected by rubber gaskets.  If you're lugging the motor, the temps build up higher than the plastic can take.  It might take a while, but eventually it happens.

An even easier check might be the exhaust filter itself - I think they'd still have one in your year.  It's right behind the flush and telltale fitting that exits the back.  6 screws removes its cover, and inside there is a foam filter.  Cleanable, unless it's also burnt/melted.

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Rodriguezc51

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Posts: 14
Reply with quote  #8 
Hey Phil thanks for the feed back yeah I typically keep it at 4000 When I'm running. I think I am going to drop the lu and Check
The exhaust system that makes a lot of sense I'm hoping that's it. i recently started flushing the engine running the hose through the flush instead of the muffs on the lu I wonder if that might of knocked some stuff lose and clogged the exhaust?
PhilH12

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Reply with quote  #9 
I don't think the flushing would cause an exhaust problem.  What you can do on the hose to the fitting is apply too much water pressure.  That will blow hoses off of their fittings, that on mine are held only by zip ties.

I've flushed through the fitting, but have gone back to the muffs.  You can't give it too much water pressure that way - in fact, more is better IMHO.  [wink]

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Rodriguezc51

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Posts: 14
Reply with quote  #10 
So I dropped the lower unit and pain my flashlight up seems like a 1 1/2 inch square pipe seems pretty open doesn't look like like a lot of build up. Exhaust filter is black not sure what a clogged one would look like. Hm I was hoping to see a giant carbon ball blocking but not the case.
PhilH12

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Reply with quote  #11 
Mine's a lot bigger than 1 1/2" square - I'm thinking closer to  2 1/2" - 3"?  Your's may be a different newer design though.

The filter "should" look like wide open-cell foam (but it's black).  Plenty of openings through there for the exhaust to pass through.  If it's black and solid, you may be onto something.  Try spraying it with GumOut, etc, and see what it looks like then.  Hold it up to the light - can you see light through it?

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Glenlivet

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Posts: 52
Reply with quote  #12 
Quote:
Originally Posted by Rodriguezc51
Glenlivet that sounds interesting exhaust innards? I saw a video of clogged exhaust tube causing similar problem? Is that what you mean?

No. The inner housing and megaphone had ‘melted’ under the previous owner. I imagine lack of back pressure etc caused the lack of revs. Ran ok up to 3500 and would rev higher when trimmed up to ventilation point but not under any load.

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Rodriguezc51

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Posts: 14
Reply with quote  #13 
We'll I took the exhaust filter off completely just to see Put it in the water and same issue? I don't know... all the exhaust parts seems intact when I dropped the lu nothing melted or broken nothing obvious...
Huey

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Reply with quote  #14 
Start with the basics. Three good spark, three good compression and with Ev diag do static and dynamic tests on the fuel system to see if you can pin point which cylinder is not doing it's job.
Rodriguezc51

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Posts: 14
Reply with quote  #15 
Hey Huey thanks for the feed back I have a question. Will this engine idle on any two cylinders or due to the the firing order it has to be 1 and 3 to run on two. Idk if I worded that right but I can disconnect just about everything on the middle cylinder and it seems to run the same? Does that sound right?
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