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PhilH12

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Posts: 1,750
Reply with quote  #16 
Hi Dirk,

If the plugs were in some other (automotive, etc.) motor, I'd "like" them.  [wink]  In an E-Tec, they still look to be running "lean" to me (no expert).  Now that I've learned 'better' on here, I want to see them black-looking.  Now I'm saving a few bucks on plugs as they were looking black every time I took one out.  Wow, gotta change these out again?  Last time was only like 5 or 10 hours ago!  LOL

I'd be watching motor temps, etc. but not sure that running lean would show up.  A definite "maybe" there.

Yes, switched to XD-100 'out of the gate' when I bought this 2007 boat/motor with about 100 hours on it about 2.5 years ago, and then first learned about XD-100.  Later found that my motor was programmed for it.

I use 'pump gas' here in Texas - up to 10% ethanol, if I'm not mistaken.  Same as I use in my new truck, lawn tractor, etc, etc.  I "heard" that there's a marina right across from us that sells gas at about $7 - $9 a gallon.  What???  Not sure if it's 'pure' fuel or not, but I don't think I'll be fueling up there any time soon.  I pay about $2.20 a gallon these days at the pump.  Gotta carry those jugs down the length of the pier, and pour them in.  For $5 or so a gallon difference, I guess I can still do that.  [smile]

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
WernerF

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Posts: 59
Reply with quote  #17 
To me the plug looks good.

A black spark plug is somewhat typical in an E-Tec , but not desireable. The black carbon layer is a side effect of stratified combustion mode (a clowd of rich mixture in a clean air environment).

How much carbon has accumulated on the spark plug depends mostly on the temperature and the combustion mode the plug has seen for the last five or ten minutes.
If you are running at or above 4k for some time and then shut the engine off the plugs will look exactly like yours.
Burbach_Boy

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Posts: 13
Reply with quote  #18 
Hey Guys,

just a quick follow up on this topic. I had the outboard at the shop for service and the technician told me that the misfiring phenomenon is quite common.
What he explained to me is that the engine has two operation modes depending on the revs and the load conditions. At low revs it uses only a part of the combustion chamber in order to save fuel and reduce the emissions. At higher revs it switches to a different mode using the full combustion chamber. This does not happen at a fixed rpm but is controlled by the software depending on several parameters.
When the engine is operated close to the switching point the misfiring can happen occasionally. He told me that reving the engine up and down again fixes it in some cases as there is a hysteresis in the control algorithm.
He also did some software adjustments in order to optimize something which I didn't really understand to be honest.
However, I did not have a chance to test the outboard yet as spring is still in the low gear here.
I will let you know if I see any effect...

Greetings,

Dirk
duane4238

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Posts: 66
Reply with quote  #19 
To PhilH12 and others- I've found that changing spark plugs can be a little bit expensive. After looking around, I ordered some at a local NAPA dealer and was quite surprised at the lower price. (QC12PEP)  I then tried rockautodotcom and was amazed. I ordered a total of 15 to have on hand for future use. 
Duane
PhilH12

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Posts: 1,750
Reply with quote  #20 
Duane - The only Caution there is to NOT swap exact plugs that are recommended.  There are some models that can "swap" for equivalent plugs, but mine is in the chart as "Do Not Swap".  Thus, now that I've learned something on here, I only use the QC12PEPB in my year motor.

Anyone need a dozen or so XC12PEPB?  I bought 'em thinking they'd be OK, but now won't take the risk of putting them in.  Don't think they'll work in my lawn tractor either.  [frown]

And BTW, thanks to WernerF for clarifying the "plug look" above.  I always have to idle in (bare steerage) towards the slip, get a wind and drift reading, and then aim my barge at 1 or 2 slips away, so that I ease into my own slip.  I've already been in the No Wake zone for a couple hundred yards, so my plugs always do look black, as expected in that lower combustion zone.

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
rickmcd53

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Posts: 1,100
Reply with quote  #21 
My 75hp Etec's ran below 1800 rpm for about 12 hours per weekend with a few 10 minute bursts above 4000. I changed my plugs on the first one at 600 hours then about 1400 hours when I sold it. The next one I sold at 400 hours and a year later it's still running the factory plugs.
On our customers boats we check them at 300 hours and usually spray them with engine tuner to remove any carbon and re install them.
2004etec90

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Posts: 328
Reply with quote  #22 
I just skimmed this post and am not convinced the engine is running as Huey suggested:

"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"

If you are not running 5200 WOT (wide open throttle, in forward, on the lake) Original Poster, you are chasing your tail. 

If this point has nut sunk in, re-read my last sentence.  

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2005 90hp I3 - Model E 90 DP L SO R - Serial 05083190 - 1972 18ft Starcraft Holiday
Burbach_Boy

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Posts: 13
Reply with quote  #23 
Hey Guys,

just a quick summary to close this topic from my side.

1. Misfiring: After having the motor inspected it became better but there is still a slight tendency to occasional misfiring at about 2000rpm. The dealer tried to improve it by making some software adjustments and it seems that is has improved the situation. Whenever this occurs a slight change of the rpm helps in my case. No big deal for me if this is normal for these engines.

2. Color of spark plugs: The guy explained to me exactly what you have said. The color of the plugs depends on the operation mode the motor was in in the last minutes before it was stopped the last time.
They are either brown or black. Not a reliable indicator for the engine's health I would think ;-)

3. RPM at WOT: After the last test drive I have actually achieved 5200rpm. So I think the trimming is fine. there is no relation to the misfiring effect.

Thanks again for all your input!

Dirk
2004etec90

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Posts: 328
Reply with quote  #24 
i find with my I3 that right around the range where it transitions between stratified to the other mode that it begins to miss slightly.  

I just avoid that RPM range.

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2005 90hp I3 - Model E 90 DP L SO R - Serial 05083190 - 1972 18ft Starcraft Holiday
TC_Motor

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Posts: 1
Reply with quote  #25 
Hello

I have a Etec 75hp. From 2017. It had now 6 hours. It runs very good. Only between 2000 and 3000 It has misfires wich you can feel throughout the boat. Under 2000 runs perfect, above 3000 perfect.... max is 5200rpm.
After contacting in Belgium and Holland dealers wich say this is normal and reading here i think it is something build in in the I 3.
I had a I 2 60hp on the same boat and I did not have This “problem”.
Have these engines a stratified combustion in lower and mid range rpm and normal combustion in higher rpm?
Where can I buy the technical manual of this engine?
Thanks!!
Johan Thys
Huey

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Posts: 13,135
Reply with quote  #26 
All E-TEC run stratified fuel charge at lower RPM and on some hulls when the change happens you can feel it, like changing gears in a car for the layman. A tech can play with TPS calibration to suit your hull and make sure the engine is running at correct temps at low speeds help as does the prop and engine mounting height. You can buy a service manual from Barnacle Bill's.
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