Jump to content
The mkiv Supra Owners Club

Strange whining/moaning noise from engine bay - NA manual


parasight

Recommended Posts

Hello (again!)

 

I've got this strange whining/moaning noise coming from the engine bay. It seems to come from around the throttle body area, at the Y-pipe join on the NA intake manifold. I could be wrong, and it could be from another bit of the bay. It's pretty loud, and you can hear it inside the car while idling. It doesn't stay all the time, and it doesn't remain when it's revved. The best way I can think of describing it would be a couple of Walbro fuel pumps at full flow. I've attached a couple of recording I took, one of the noise itself, and one of the noise, and it stopping when the engine turned off. I put my phone right above the Y-pipe, so all you can hear is the noise.

 

Any help or advice would be appreciated! I'll even take the odd NA barb! :)

 

 

P.S. I've had to zip the audio files, since I can't seem to upload them otherwise.

Noises.zip

Link to comment
Share on other sites

Have a good listen to both your power steering pump and your air con pump, it would more than likely be one of those.

 

You can take of the aux belt and then run it briefly it see if the noise goes......this will definitely point you towards the above or possible the alternator pulley. Basically if it goes check all the pulleys the aux belt goes for rough movement.

Link to comment
Share on other sites

Thought it wouldn't be the PS pump because it doesn't change while turning the wheel at all? Aircon hasn't been used in a while, so unless the pump works on an electromagnetic clutch that is now constantly on, I wouldn't think that's the case? Either way, I could be wrong. I'll check the levels, check the belts, and maybe even open up the intake manifold to check whether it isn't something in there.

 

Fingers crossed it isn't major. Not the most fun sound, though.

Link to comment
Share on other sites

Oh well, sound's gone away. Checked the PS fluid, seems to be ok. The COLD indicator was covered when I pulled it out, cleaned it, dipped it back in to check. I can't seem to find an A/C line anywhere, so I'm wondering if my car has this deleted. I didn't do the obvious, which was to check all the ancillaries that the belt went to. :o

Link to comment
Share on other sites

Your a/c line runs along in front of the radiator, that's where the sight glass is located. That should be full of liquid when the compressor runs, if it isn't then your compressor isn't compressing or the system is down on refrigerant charge, which in turn could be why your compressor isn't running. The a/c compressor only engages when the low pressure sensor switch activates the clutch. So if you have a/c switched off then the compressor will not be running.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.