Idle problems

[Livinlinelife]

Hey guys,
I have 2005 F90tlrd 90 4-stroke twins I'll refer to them as motor 1 and motor 2.
Motor 1 was idling really high around 2800 RPMs. I thought the idle control valve was bad so I took it off cleaned it and reinstalled it on motor 2 and took the one off of motor 2 and installed on motor 1. Motor 2 started off idling high but went down to normal ( around 700 RPMs) after a few starts and stops it works perfect again. Motor 1 started up and ran perfect at the time, but after I took it out the first time since it started doing the same thing again.
Thanks guys I hope I have given enough info to work with. Please help!

[Livinlinelife]

Hey guys,
I have 2005 F90tlrd 90 4-stroke twins I'll refer to them as motor 1 and motor 2.
Motor 1 was idling really high around 2800 RPMs. I thought the idle control valve was bad so I took it off cleaned it and reinstalled it on motor 2 and took the one off of motor 2 and installed on motor 1. Motor 2 started off idling high but went down to normal ( around 700 RPMs) after a few starts and stops it works perfect again. Motor 1 started up and ran perfect at the time, but after I took it out the first time since it started doing the same thing again.
Thanks guys I hope I have given enough info to work with. Please help!

Can anyone tell me what would make the idle control valve not work properly?
I'm not a mechanic so I don't completely understand all the newer electronics.
But I had a 90s model 88 Jonson that seemed bullet proof compared to these yamahas!

[greasyshaft]

Needs to go on computer(YDS). Should be able to do an active test on isc valve.
If ISC valve is stuck open. the ECU will request that it be closed
If the ISC request is at 100% something is bullshiting the ECU.

[Livinlinelife]

Thanks greasyshaft. I talked to a mec and I'll have to talk to another to get a computer on it because he won't do it on the weekends nor will he do it Friday afternoon. He suggested I drop it off one morning before I go to work but 4:30 AM is a little to early for him as well.

Is $118 the going rate to put an f90tlrd on a puter?

[Livinlinelife]

Update, I was going around checking everything making shur I didn't miss anything and I unplugged the throttle positioning sensor to check voltage between it and the other motor for differences and when I pluged it back in and started it it ran fine. Idled at 700 RPMs.

Could it have been as simple as a slightly loose elec. plug?

[boscoe99]

The F90 EFI model is known for having a problem with respect to the ISC valve connector. The cowl snags on wiring which goes to the connector. Carefully inspect the wire itself and in particular the connection of the wire to the connector terminal.

[Livinlinelife]

The F90 EFI model is known for having a problem with respect to the ISC valve connector. The cowl snags on wiring which goes to the connector. Carefully inspect the wire itself and in particular the connection of the wire to the connector terminal.

Thanks biscoe99, I can see where that might happen on my motor in a couple of places all looks good.

If that did happen and the connector was moved slightly but not unplugged do you think it would cause my problem?

When I unplugged it I had to depress the connector to un plug, and it worked great once I plugged it back in.