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ReelFortunate

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Posts: 7
Reply with quote  #1 
Hi everyone I’m looking for some help with a pair of 3cyl 150hp eninges that have just hit 50 hours and have fouled two sets of spark plugs. The boat travels about an hour idling before I can get the boat on plane. Has anyone experienced the same issue and know of a fix for this concern. Since new I have been running rec 90 fuel and Evinrude xd100 oil. Thanks for any help you can offer.
PhilH12

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Posts: 3,491
Reply with quote  #2 
Exact Models please?  3 cyl 150's surely suggest the "latest and greatest" of the G2's.

To my knowledge, the plugs still do look like they're 'fouled' but that's normal unless they are Fluffy fouled or wet.

You do have correct engine height and props on your new setup?  What's the WOT rpm's when you get on plane?

Apologies for more Q's than A's.

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
ReelFortunate

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Posts: 7
Reply with quote  #3 
Happy to answer any questions that can help lead to getting this fixed. Model numbers are K150WXFAAA and K150WXCAAA I have not finalized the checking of the engine height yet because the seas have been a little to rough for me to hang off the transom to see. The motors have 14.5x21 RX3’s. Wide open it runs 51 mph @ 5400 rpms loaded full of fuel, fresh water, bait, ice, fishing gear and three adult males. The plugs will foul enough that the motors will not idle and constantly stall. I’m not willing to take a chance to idle an hour to the port to see if running it will clean the plugs.
steelhead

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Posts: 4,086
Reply with quote  #4 

Normal looking blacken layer carbon on insulator of E-TEC sparkplugs after a few hours of running.  The hard black thin carbon layer is normal in all direct injection motors, 2 and 4 stroke.

The E-TEC injector sprays a cold gas high pressure mist directly onto the plug.  Creates the thin black carbon when E-TECs are running correctly.

Evinrude fine wire iridium plug
normal appearance after few hours running.

bAsZk3z.jpg

Not the old 2 stroker carb'd plugs nor 4 smoker carb'd or EFI plugs that are black oilly to brown to crisp white with melted ceramic insulators

Do the motors do lots of trolling at low rpms?
Do the motors get blown out every couple hours?
What are the slow idle troll engine temps on the gauge?

Run Carbon Guard carbon cleaner in every tank and E. Fuel System cleaner for the injectors.

Run only XD100 in these G2 3cyl hi pro 150 motors.

Have your dealer check your motors for the latest EMM engine control firmware, there may be a new air/fuel map.

He can also check for strong spark each plug at the shop.  Only takes 1 weak coil or wire to cause rough idle.

 

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ReelFortunate

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Posts: 7
Reply with quote  #5 
Most of the hours are spent idling through the intercostal and trolling for dolphin. It’ll run about 1300rpm on both motors or 1700rpm on one.It’s only about a ten minute ride at 30mph out to water deep enough to start trolling. That’s about what the plugs looked like when they were changed. First time the problem started it was just the starboard motor that had the issue and it was thought that since it they had only 18 hours that maybe it was the break in cycle that caused the problem. Had the boat out fishing on Father’s Day everything was good then out again the next day with no issues. This past Friday everything was fine all day fishing. I took the family for a ride in the intercostal Saturday night and before I made it back to the house the port motor was having issues stalling and running extremely rough. Today’s fishing trip went down the drain.
ELGIN

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Posts: 50
Reply with quote  #6 
My thoughts are the same as above, look at the idle speed cylinder head temps and see what the date codes on the plugs are, are you getting the new plugs from a Evinrude dealer or the auto parts store? see pic for date code location. See the 8D just below the metal hex, that's your date code.

20200621_132338.jpg

ReelFortunate

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Posts: 7
Reply with quote  #7 
Thanks for the information Elgin. What should I look for as far as a date code. The plugs that are in the motor now have a date code of 0A. Both motors according to the Icon display run just below halfway on the bar graph. I’m not familiar enough with the screen to know how to display the cylinder head temp. I do have access to a laptop with the EV6 diag and should be able to monitor the temps that way.
ELGIN

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Posts: 50
Reply with quote  #8 
The date code appears to be January of 2020 so they are the latest build, use the diag 6 to monitor the cylinder head temps and see if the stay around 140-160 degrees at idle, any lower than that and you will have issues with plugs. 
ReelFortunate

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Posts: 7
Reply with quote  #9 
Hopefully have the spark plug fouling issue resolved I loaded the latest software into the EMM’s. Looks like the motors idle higher by about 50 rpms higher in nuetral at 550 rpm and when you put them in gear they kick up to 650 rpm I’ll keep you posted.
ajtec

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Posts: 139
Reply with quote  #10 
Hopefully your situated. Other then what was already discussed, one thing I have noticed is differences in rec fuel and E-10. I know E-10 is not what you posted as running above but in some parts of the country E-10 is all you can buy. I also know people prefer not to run it. (BUT) I have seen how both affect the running quality of a marine engine as well as how they affect the spark plugs in an E-TEC. Many may object but I would try E-10 and see what you have if the latest map has not addressed your concern.
ReelFortunate

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Posts: 7
Reply with quote  #11 
Thanks for the reply I will take that into consideration if the new map doesn’t take care of the problem. I can run the regular fuel if I need I was just running the rec fuel because of the regular fuel absorbing moisture especially if the boat is going to be sitting a month or two and how bad the humidity is in South Florida.
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