Yamaha F250 High Idle Help ........

[pstephens46]

not sure water splashed on lower cowling would get up to the to of motor where that cam sensor is located.

but pay attention to what Bosco was refering to on water traveling up fom some sensors when they leak

There should be dried salt in different areas giving some clue. I get a little on the back of my motor from time to time.

[panasonic]

Tape a piece of paper next to or over the sensor, run the boat for a bit as normal and check if the paper is wet..

[Who's your daddy]

Update

Update- picked up a cam position sensor/ new plug end and installed. Cranked up and ran for a few minutes. Still idles high at 900 RPMs. After running it, ran another diagnostic test the it still showed a cam position sensor code as well as a intake pressure sensor code.

I’m lost now ........

[boscoe99]

Update- picked up a cam position sensor/ new plug end and installed. Cranked up and ran for a few minutes. Still idles high at 900 RPMs. After running it, ran another diagnostic test the it still showed a cam position sensor code as well as a intake pressure sensor code.

I’m lost now ........

The code is set when the ECU does not get a proper input from the sensor.

If the sensor is working just fine, but does not get a proper input, then the sensor is going to give the ECU an improper output. The ECU will set the code.

If the sensor is working just fine, and does get a proper input, but the sensor can not convey the proper input to the ECU, the ECU will set the code.

It could very well be a wiring issue either to the sensor or from the sensor. The manual provides a test procedure for both the sensor on its own, for the input to the sensor and for the wiring.