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EDZ

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Reply with quote  #1 
2008 exec 115 hp loses power from cruise rpm say 4000 down to 1200 or so, unless you pull back on the throttle the engine will completely die and will only start after about a minute or two. If you pull back on the throttle to idle engine will continue to run and after a few seconds you can run run it back to full throttle only to repeat all of the above. It will run ok at low rpm say 1500 to 2000. It runs fine on ears. Under load is where the trouble starts. Will be checking fuel pressure next. The fuel pump was locked up and broke lose with 24 volts applied. Was disconnected from EMM when 24 volts applied. Boat had been setting for 3 years. Changed the fuel and filters and had to bust the fuel pump lose. Any suggestions for an e-tec novice. Have the manual and diagnostic software. The previous owner apparently replaced th EMM because is shows only 11 hours, And the engine a little over 200 hours. Ideas about what to check will be greatly appreciated.
Thanks Ed








2004etec90

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Reply with quote  #2 
Post model and serial number is a must for this site. I just put that info in my signature.

An engine like this with 3 years storage on it - I’d be taking the injectors off and sending to fuel injector man. You are risking ethonol phase separation which will damage rubbers and metal fuel system components. Then you will run lean, and blow an otherwise good motor.



I’d also disassemble the entire fuel system for inspection. It could be perfect inside, but it could also be a mess, ruining any efforts at cleaning the injectors.

You need to check all fuel pressures. They are:

- Suction side of low lift diaphragm pump
- high side of low lift pump
- high pressure pump output.

Also remove the cone VST filter at the return line to the VST tank from the injectors. Watch for varnish in the VST filter. My VST filter could be opened up from top - I removed it and inspected it.

Also post results of spark test and compression test.


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2005 90hp I3 - Model E 90 DP L SO R - Serial 05083190 - 1972 18ft Starcraft Holiday
2004etec90

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Reply with quote  #3 
Here is a comprehensive thread on something similar. Yiu May be doin major damage running this motor as you are:

https://www.etecownersgroup.com/post/2005-e90dsl-wish-me-luck-10167316

Pay particular attention to steelhead he has oodles of experience.

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

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Posts: 3
Reply with quote  #4 
Quote:
Originally Posted by 2004etec90
Here is a comprehensive thread on something similar. Yiu May be doin major damage running this motor as you are:

https://www.etecownersgroup.com/post/2005-e90dsl-wish-me-luck-10167316

Pay particular attention to steelhead he has oodles of experience.
EDZ

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Reply with quote  #5 
Thanks for the recommendation to check the vst screen and reservoir. Apparently the previous owner used ethanol mix gas and the ethanol ate the inside of the rubber gas line from the last fuel filter to the vst. There was a large accumulation of rubber debris in the fuel inlet neck, stopping nearly all fuel flow to the vst. Also the fuel line was extremely thin in several places, which posed a threat of fire. After a thorough cleaning, the engine runs smooth. Another lesson learned here. Do not run ethanol in the etec engines. We will run with the injectors as they are unless a problem surfaces.
PhilH12

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Reply with quote  #6 
Not to rain on your party, but did you replace those thin hoses?, and you didn't mention the VST filter either.  Just cleaning a couple things out doesn't mean you've solved everything 'permanently'.  EDIT: Did you clean the bottom screen of the HP pump?

Just to clarify - it isn't just Running ethanol that's really the problem.  It's more about letting ethanol fuel get Stale, water-logged and Caustic - aka Phase Separation.  When it happens, that stuff eats anything rubber for lunch.  Absolutely true that some guys do avoid it altogether, and some guys run nothing else but E10 ethanol fuel "quite successfully" for years.

Good luck!

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
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