F115 Power/rpm Loss

[Mudhole1]

I have a 2008 F115 that is experiencing an RPM loss to around 2000-2500 rpms. To date I have had the following done by a Yamaha mechanic:
Fuel system flushed
replaced fuel filter
Fuel injectors cleaned
Added a new water/fuel seperater
Replaced the fuel filter
Lowered the oil level
Checked plugs

No love....any ideas?

 

[Mudhole1]

Re: F115 Power/rpm Loss

According to my mechanic, the next step is sending the fuel injectors to Florida for cleaning and replacing the fuel line all the way to the tank. Anybody else had to do this?

 

[Triton II]

Re: F115 Power/rpm Loss

Are you getting any alarms or gauge warnings? If so please post them here as accurately as possible to aid diagnosis. The ECU in the F115 has a limp home mode which may have been triggered. Rodbolt will be able to help you better - I'm not a tech by trade, but do have the same motor as you (09) so I'm "guessing from experience" if you like and any info on alarms/warnings will help.

TII

 

[gblskl]

Re: F115 Power/rpm Loss

send fuel injectors to injector warehouse blackwood nj.Had them flow tested cleaned and re tested back in three days 120 bucks.

 

[Mudhole1]

Re: F115 Power/rpm Loss

There were no alarms that went off. The injectors are on their way to Florida as I write. (Thanks for the NJ option but too late for me).

 

[rodbolt]

Re: F115 Power/rpm Loss

rather than tossing parts,monitor fuel rail pressure and TPS voltage at the problem RPM and load.
yes injector screens can clog.
DO NOT play with the cam timig.
it CANNOT jump time unless somethig breaks then its all broke.
I am doing yet another F115 that a backyadigan messed with the timing belt and smoked all 8 intake valves and possibly the pistons.
will know more monday but my borescope and leakdown tester already confimed the issue.

 

[magnumrapala]

Re: F115 Power/rpm Loss

When you say loosing power does it stay at 2500 rps or once you hit it does it fall back down?