Electronic Throttle

[JoeMama]

I have a 2007 Malibu LSV and getting some high pitch noise in stereo only when engine running. BUT I noticed if I move the electronic throttle (2007 Malibu) a little such that the boat is not really moving forward, I can make the high pitch noise go away. This seems to imply that the noise is coming from the electronic throttle and into stereo head unit or that the electronic throttle is somehow affecting Alternator noise (which is getting into stereo head unit)

Does anyone know how to take the electronic throttle apart so I can find out why this is affecting the high pitch noise? Also, only want to do this if its not too hard as I dont want to take it apart and risk breaking it if its complicated.

Thanks,

[Steve B.]

Dont take the throttle apart, at least yet. Maybe David from Earmark can chime in, but I have a feeling it's not related at all to that.

Steve B.

[srintx]

I would agree, don't take apart the throttle yet!

I would first ensure that you have everything going to a common GOOD ground. Ensuring that it's a bolt would be the best bet.

Also, are you using shielded RCA cables? Also, check your batteries...are the holding a charge is it time to replace them?

[JoeMama]

I would agree, don't take apart the throttle yet!

I would first ensure that you have everything going to a common GOOD ground. Ensuring that it's a bolt would be the best bet.

Also, are you using shielded RCA cables? Also, check your batteries...are the holding a charge is it time to replace them?

Maybe I am wrong but it seems the Electronic Throttle may be easy to investigate. I think its just a potentiometer connecting to the throttle.

[wakeboarder3780]

I assume you have an audio system that has amplifiers yes? Hum in the audio from engine noise is almost always your RCA plugs. Invest in some quality shielded RCA plugs that run from your head unit to the amp. Then, try to run the RCA wires away from anything that will vibrate.

Been a while since i've been into audio but this is what i remember of the top of my head.

[23lsv]

The noise is not coming from the throttle, it's coming from the throttle position sensor on the throttle plate. But that noise is always there. It's electrical noise. That noise also comes from your fuel pump, alternator, starter, heater motor, shower pump, ballast pumps, etc. If your boat has amplifiers for the stereo they amplify electrical noise and thus they must be properly shielded. Grounds are the largest problem with boat stereos as there is a lot of interference on the ground circuits that's why they need to be clean, tight and free of any corrosion. Any of the stereo components could be faulty and they need to be isolated and tested separately. Something has faulted and is picking up that " electrical noise".