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Etec detonation

Discussion Forum at MarineEngine.com » Johnson Evinrude Outboard » Archive through November 06, 2009 » Etec detonation « Previous Next »

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john stephens
New member
Username: john_stephens

Post Number: 1
Registered: 11-2009
Posted on Wednesday, November 04, 2009 - 12:03 pm:   Edit Post Delete Post View Post/Check IP

250 etec has complely destroyed 2 pistons due to detonation what could cause this only 2 holes on a direct ingection electronic engine and why.
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jwbmarine
Senior Member
Username: jwbmarine

Post Number: 5092
Registered: 11-2005
Posted on Wednesday, November 04, 2009 - 07:23 pm:   Edit Post Delete Post View Post/Check IP

http://bbcboards.zeroforum.com/zerothread/437574-survey-250-ho-issues
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Morten Ringvold
Senior Member
Username: haffiman37

Post Number: 4337
Registered: 04-2006


Posted on Wednesday, November 04, 2009 - 08:24 pm:   Edit Post Delete Post View Post/Check IP

Detonation on DI engines are normally caused by either engine not reaching max recommended RPM or faulty injectors.
If on the 2 upper cyl's, check your cooling capacity (pressure).
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Cliff Casavant
Advanced Member
Username: chickenfry

Post Number: 167
Registered: 05-2009


Posted on Friday, November 06, 2009 - 02:50 pm:   Edit Post Delete Post View Post/Check IP

I have herd the low fuel can starve the upper cylinders.

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