Hi guys. I'm relatively new to the forums and to 350z's in general. I've been noticing that when I touch the gas pedal I get a faint electric buzzing sound. It seems to be louder in fourth gear and just perceptible above the radio but very obvious when it's not on. Has anyone else ever gotten this or know what is going on? Thanks for any help.

 

Post a video, the description is not bad but a bit vague. Not everyone interprets buzzing in the same way. Try and take the video from multiple angles as sometimes angle can really affect how the camera mic picks up audio.

I hope this helps, and you find your cause/resolution

 

Does it happen if you rev the engine with the clutch in? What about in neutral?

 

Did some more in depth diagnostic today on the drive to work. It only makes the sound in fourth and under light throttle. Otherwise the car sounds fine. I will try to get videos of it but it is very faint. It is also has to be electrical because it's by no means a rattle, rattle would continue to make noise at other times. Sorry if this is a noob question but are the 08s drive by wire?

^Vivid I do get a noise when I release the clutch in neutral and I don't seem to hear it when I rev the engine. Just seems to be something in 4th gear...Oh and when the car is warmed up too, around 2500-3200 RPM seems to be the loudest/most perceptible.

 

I’m not sure exactly what you mean by “drive by wire” but the steering systems is mechanical. The throttle is electronic. From the shop manual”

“Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition. The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.”

And just to be clear, the throttle motor is part of throttle body that sets on each side of the manifold where the air inlet tubes attach.

 

Hey guys...finally got around to taking a video. Please bear with me as it is iPhone quality.

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I try to show a combination of engine RPM while its making the noise. I'm also in 4th gear, it seems to be the only time it makes this noise.

 

"Drive by wire" is a blanket term for what you just described. More specifically, you described throttle by wire. "drive by wire" is used to described electronically controlled braking, steering, or throttle.