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Harf

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Posts: 21
Reply with quote  #1 

Hey guys scratching my head with this one.  Bought a used 90 from a reputable dealer who rebuilt the powerhead as part of the deal.  They total me it had a failed cylinder which drove the rebuilt power head.  Also told me they replaced the injector on the cylinder that failed.

When starting the motor at the dock idles fine.  Put it under a little load and it sputters.  Once it gets past this point she runs like a raped ape but…   I can hear a noise that almost sounds like a metal to metal ping and the motor jerks when it happens.  I then Drop down off plane and start over from idle.  I hear it back firing as I go through the ranges to back up on plane.  No metal to metal sound at the lower RPMs just a distinct sputter i.e. backfire.  I’ve had it back to the dealer who did the power head but they seem lost.  I have a boat ride setup with them for next week based on tide level near their shop. 

Any suggestions so I can sound half way intelligent when I talk to these guys?

Everything new in the fuel system.  I have replaced the fuel and associated filters.

Thanks in advance for any input.

Harf

 

Huey

Moderator
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Posts: 13,838
Reply with quote  #2 
I think once they have it connected to Ev diag they can do things like TPS calibration, checking 55V circuit, seeing what software is loaded, checking WOT RPM, making sure the inj co-efficients are matching, do a drop test with engine running to see if they can isolate a cylinder, richen/lean injectors too. Of course this is all assuming the basics are good and do not overlook reeds. As for metal to metal sound, impossible to say without hearing said sound what that could be but first thing to check is the gearbox lube to make sure it is good down there and then the basics like compression and leak down tests.
Harf

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Posts: 21
Reply with quote  #3 
Thanks for the feedback Huey.  I have a test ride set up with them for next Friday.  I may not have described the metal sound that well.  I think its just the result of a High Speed backfire.  no consistent pattern very random but frequent enough to notice and concern me.  I'm worried that whatever blew-up this power head in the first place could be still there beating on the new powerhead.  thanks again for the feedback. 
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