Brought to you by Barnacle Bill's Marine Supply. (856) 785 9455

Sign up Latest Topics
 
 
 


Reply
  Author   Comment   Page 1 of 2      1   2   Next
Burbach_Boy

Registered:
Posts: 13
Reply with quote  #1 
Hello E-TEC Owners,

I have a 2005 E-Tec 90 (E 90 DPL SR) which shows the following behaviour:

When I have run the engine for about 30 minutes at about 2000rpm it starts to generate occasional slight shocks which I can feel in the boat body. Also the engine makes a slight unregular move each time a shock occurs. I assume it is misfiring but I can not really check it. It disappears in idle rpm and I don't observe anything at >3000rpm (maybe it's just not obvious then). The engine generates sufficient power at any rpm. Also when I quickly increase the rpm in neutral it does not smothely speed up but makes an unregular sound until it reaches a stable rpm. I have changed the spark plugs and adjusted them as good as I could. The old ones were dry with light brown colour and slightly worn. However, the behaviour did not change.

Any suggestion what could be wrong? Can I check anything else by myself?

Appreciate your feedback.

Thanks,

Dirk
Huey

Moderator
Registered:
Posts: 13,248
Reply with quote  #2 
Normal to not be able to rev in neutral. You need to make sure you are seeing correct 5000-5200RPM at WOT and a TPS calibration can help. Whether you can 'check" these things yourself who knows and make sure the basics are good, someone has serviced the VST filter since new and a clean of the injectors would be wise on a 12 year old outboard. What plugs did you fit?
PhilH12

Registered:
Posts: 1,786
Reply with quote  #3 
++ to Huey.  I'd also be a bit suspicious of running 'Lean'.  Light brown insulator color isn't normal, to my knowledge.  They should look black, but still not all 'fluffed up' with soot.  How long do you run at WOT?

Sounds a bit to my "shade tree mind" like 'fuel delivery' and 'injector tests' time.  Get yourself a real Service Manual if you don't have one.  It's all in there, and I wouldn't be running at WOT for long, if at all, until you figure this out.

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
rickmcd53

Registered:
Posts: 1,186
Reply with quote  #4 
I agree with all of Huey's suggestions as he has much more experience than I have. From what I have seen the 75/90's don't have the mid range torque to run well between 2000 - 4000 rpm. The typical install of these engine's around here is on 16 ft boats that either run below 1800 or get up on plane and run above 3800, the engines work well that way. I have put over 2000 hours on two different 75's mounted on my 25ft, 2500lb houseboat running a 9 or 11 pitch prop. They were both new, 2011 and 2014 engines and both had the same mid-range miss fire that you are describing. They both seemed to do pretty well when I had to keep the bow down and "push" the boat through rough water. I switched to a pontoon 90 series designed for mid-range torque, ran a 13 pitch prop and the difference was amazing. No miss fire and it has power across the entire RPM range.
Burbach_Boy

Registered:
Posts: 13
Reply with quote  #5 
Hey Guys,

thanks a lot for your quick reaction and valuable thoughts. I assume by checking the rpm at WOT you mean reving the engine up while not in the water? Does it have a rpm limiter? In the water I had it up to about 5000rpm while doing 30knots on a 5m boat. I think this is o.k. for a 90hp engine. So I don't think any power is missing. I have a service manual but just didn't find the time to work through it yet.
I will have the engine serviced by a certified Evinrude dealer in the next weeks but the problem is hard to detect as it occurs only occasionally. So I wonder if there is anything specific I should ask him to check besides the normal service tasks?

Greetings,

Dirk
Burbach_Boy

Registered:
Posts: 13
Reply with quote  #6 
Oh, I forgot: The spark plugs I fitted were Champion QC12PEP
PhilH12

Registered:
Posts: 1,786
Reply with quote  #7 
NO on WOT!!!  Don't even go there.  WOT is for "In the Water, and trimmed 'correctly for your boat".

You do have "almost" the same plugs as I, but not sure off the top of my head for your year.  Mine are QC12PEPB.

MY OPTIMUM WOT for 2007 is 5,000 - 5,200.  Check motor height first, although you are at the 'bottom' of the range - Was that with a Normal Load?  Many posts on here with a "Search" on the Blue Tab up in the top right corner.

Many service lists don't check the VST Filter, or the Exhaust filter.  Make sure yours are OK.

Phil

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

Registered:
Posts: 13
Reply with quote  #8 
Hi Phil,

thanks for explaning the WOT test. I was already wondering...
I see 5000rpm rarely and only on flat water and when the boat is perfectly trimmed. Under real life conditions it's more like 4700-4800rpm Maximum. Is there a problem with this? I assume that is related to the mounted propeller size? Bought the boat with motor as it is, so I assume it has the right propeller on it.

Greetings,

Dirk
PhilH12

Registered:
Posts: 1,786
Reply with quote  #9 
First, check for Your Optimum RPM range (maybe the same as mine?).  Then check your motor height on plane, with the AV plate showing just above solid water and getting splashed.  If it's not, raise the motor first to get it there.  Then check your RPM's.  They may well come right into range with the motor lift?  (Stop dragging that AV plate like a sea anchor)

From there, you'll maybe need to change props to get within that 'magical' Optimum range, where you aren't lugging your motor.  Result?  Optimum motor life and Economy.

It does sound like you're lugging a bit now, which ain't good.  "Not Good" things are happening to your motor, if you should be seeing 5,200, and are only seeing 4,700 'normally' at WOT.

I sound like I know, but it's really stuff I've learned on here from the Experts.  [wink]

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
PhilH12

Registered:
Posts: 1,786
Reply with quote  #10 
Just reading back up through the thread - sorry.  I'm still suspicious of your "light brown colour and slightly worn" plugs.  That still suggests to me that it's running Lean.  It's Normal for these motors to have 'black' looking plugs when they are running fine.

Lugging the motor should make them get even 'blacker' and 'sootier', not less.

Running Lean is even worse than Lugging (back up to Huey in Post #2), as you can maybe even melt your motor.  I'd be getting that sorted, first!

Phil

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

Moderator
Registered:
Posts: 13,248
Reply with quote  #11 
Get the engine revs into the ideal range first before you waste time chasing your tail-they are designed at WOT to be 5000-5200 and I prefer closer to 5200RPM and make sure it is accurate RPM. It will be a combination of set-up, control cables adjusted correctly, TPS voltage good, wrong prop and most likely too low in the water. A switched on dealer can easily do these things plus everything else we have told you.
Burbach_Boy

Registered:
Posts: 13
Reply with quote  #12 
Hi Phil and Huey,

wow, lots of input. This gets me really deeper into this topic, I appreciate it.
What I can read from the motor's manual is that the rpm range at WOT is specified with 4500-5500rpm with a maximum power at 5000rpm. So I am running a bit below the optimum but still in the range. What do you think? I can not check the position of the AV-plate relative to the water surface when planing as the boat is on the trailer at the moment. However, the position of the AV-plate relative to the keel looks about right to me. Here's a picture:

20171014_073752.jpg   
Regarding the colour of the spark plugs, here's another picture:

20171014_074411.jpg 

Is that what it should look like?

Greetings,

Dirk

GEB

Registered:
Posts: 1,885
Reply with quote  #13 
Hi B.B.
A couple of things to help you
As Huey advised the Optimum Rev Range for your 90 is 5000 - 5200 rpm. The Rev Range you refer to, 4500 - 5500 rpm is your WOT Operating Range. Refer to the Evinrude rpm chart in this link below provided by seahorse, Senior Moderator http://www.etecownersgroup.com/post/2017-rpm-chart-for-propping-8500250?pid=1295606565
Also this correct rigging (engine height) and Propping Guide by Prop Gods is widely accepted as the best around. http://www.veradoclub.com/index.php?topic=137.0
Rpm need to be accurately recorded by digital Tachometer and engine height correct before try to Prop for Optimum RPM as advised by Huey.
Trying to Prop any engine without getting the mounting height right first is a complete waste of time, effort and money. But don’t just take my word for it, Refer to this post http://www.etecownersgroup.com/post/all-etec-optimum-rpm-charts-from-2007-thru-2012-5396435?highlight=optimum+rev+chart by LIQUIDNIRVANA
and
http://www.etecownersgroup.com/post/evinrude-propeller-information-videos-guides-8521672?trail=#1
Also a good example of what correct Propping will do (good) for your engine
http://www.evinrudenation.com/uncategorized/perfect-pitch/
EOG is packed full of info and I’m happy to point it out to you but it must be read, absorbed and applied to be of any use. Of course there is an easier alternative, “See your Dealer”.
Cheers
GEB

__________________
Current. Stacer 389 Territory Strike. Model No.E25DTSLAFC
Serial No. 5503333
Sold. Stacer 399 Proline Angler Model No. E30DPSLAAB Serial No. 5375959
New South Wales
Australia 
The learner will not shear the rams.

PhilH12

Registered:
Posts: 1,786
Reply with quote  #14 
++ to GEB for chiming in!  [smile]   To me, and surely no Expert - that pic is what a plug "should" look like, but not in these E-Tec's.  I was surprised at all the info on here, and it can be 'daunting' at times.  I would find my plugs black looking, and change them out.  I wonder what's wrong with my motor?  Why are they like that?  Turns out they were about perfect!  Black, but not all covered in fluffy soot.

No way to tell on motor height, except running on plane and trimmed with a Normal load, as some of GEB's links will show.  As Huey suggests, try to shoot for the 'high' RPM's (+/- 5,200) to not lug your motor when loaded a bit heavier than normal.

Let us know how it goes.

Phil

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

Registered:
Posts: 13
Reply with quote  #15 
GEB,

thanks for your input. The links you have posted are very interesting. Seeing the dealer is an alternative of course but normally I don't get no such detailed information there as I am experiencing it here. I will definitely check my AV-plate during the next ride...

Phil,

I'm surprised that you actually like the look of my spark plugs [smile]. Are yours completely black? That seems to be a general observation here. What kind of fuel are you using? i think this can be the only difference, don't you think? For oil I use XD100 as probably most of you. So maybe the fuel is different in your area?

I will keep you updated about my progress...

Thanks,

Dirk
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

Disclaimer: Activities and modifications described or displayed on this message board and it's pages may be potentially dangerous. E-TEC Owners Group along with Barnacle Bills Marine does not endorse or make any claims to their safety or performance. Be sure a trained E-TEC service technician performs all your service work.