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Old 01 August 2012, 16:03   #1
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Evinrude 115 ficht missfire.....

Father reading more and more on the Internet......

As I have previously said my engine miss fires after 4250rpm....... But I have just thought could it be the fact that I only have the tcw3 oil in and not the xd50...?

The engine is fine at everything else it just seems as if there is an oil, air fuel mixture problem to?!!

Anyone else had any issue like this ?
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Old 01 August 2012, 16:35   #2
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Originally Posted by blueboy758 View Post
Father reading more and more on the Internet......

As I have previously said my engine miss fires after 4250rpm....... But I have just thought could it be the fact that I only have the tcw3 oil in and not the xd50...?

The engine is fine at everything else it just seems as if there is an oil, air fuel mixture problem to?!!

Anyone else had any issue like this ?
The oil shouldn't make any difference, as long as it's TCW3. You need to get it onto a laptop with the diagnostic software & do some dynamic tests, shutting down the injectors & ignition in turn until you narrow it down.
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Old 01 August 2012, 16:40   #3
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Plugs can be a problem. Do you know when they were last changed?
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Old 01 August 2012, 17:08   #4
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Only ever used the xd50, with no prob's, so can't compare the other, might be worth plugin her into dia's nos sticks.
Maybe a new set of ht leads might work, I remenber someone told me there quite fragile and easy to damage the internal core, only effecting performance at certain rpm/vibration levels.

Tis/probabably/bolix/though
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Old 02 August 2012, 07:47   #5
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Do you have problems starting?

As ribshop says, how many hours ago did you last change the spark plugs?
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Old 02 August 2012, 08:47   #6
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I'll give the plugs a look at and a clean as well as making sure they are indexed.
They have done about 12 hours now but it did it when they were new to.
The only problem with sticking it it's a 4 HR minimum round trip so was trying to strike a few things off first.

Yeah its the marine 2stroke I used.
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Old 02 August 2012, 08:48   #7
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And no there are no problems starting or anything.... Just over those revs, when I back off it's ok again.
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Old 02 August 2012, 11:46   #8
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To be fair, you've had this problem since February and have spent money on plugs etc trying to fault find. These are very technical engines and based on the fact the early ones had problems and were pretty fragile I would bite the bullet. If I were you, I would find a good Evinrude dealer and pay them to sort it before it damages your engine.

It's got to be money well spent in the long term.
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Old 02 August 2012, 12:04   #9
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I had a similar problem with a 90 ficht i owned, and after changing HT leads and coils, it turned out to be a plug!...
It is a pain to swap the plugs around due to the indexing, but it might be worth getting another couple of plugs, to try and track down the problem.

I when back to basics, and ran the engine on idle and pulled off and replaced the HT leads in sequence until i found the "rogue" plug...funnily enough the engine ran fine at idle on 3 cylinders...but stalled when it went down to 2 cylinders.
Obviously use well insulated pliers when pulling the HT leads off by the cap...a belt from an HT lead does nip a bit!!...

Good luck...
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Old 02 August 2012, 15:46   #10
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I think I'll have to do what you say and a process of elimination then bite the bullet as people say...... Think I am just trying to clutch that last straw.
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