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Weird (loud) harmonic noise from engine
Posted 04 August 2007 - 03:26 PM
It's not the fans, I checked that. The noise is present as long as the engine is turning and stops when the engine stops moving.
Here's what I did today:
- Removed MAF housing from intake, sprayed it with MAF cleaner (didn't touch the sensor), and reinstalled it.
- Removed intake air box, cleaned throttle body, replaced box.
- Installed new horn.
- Drilled a hole in a heat shield and inserted a sheet metal screw to keep it from rattling. (Something is still rattling, don't know if it's that one or not.)
Any ideas? I don't think anything I did would cause this, but the noise wasn't present before. I don't like weird noises.
Posted 04 August 2007 - 03:37 PM
Posted 04 August 2007 - 06:34 PM
I sprayed throttle body cleaner in there and scrubbed it out. That doesn't seem like it could be causing this, does it?
Posted 04 August 2007 - 06:39 PM
Posted 04 August 2007 - 06:43 PM
I'll try it out.
Posted 04 August 2007 - 07:06 PM
Posted 04 August 2007 - 07:18 PM
I used a mirror to take a picture down in there, does this look real gunky?
I made a video so you can hear the noise. When I put the hose back on the noise is pointed right at the camera so it really sticks out. I took it on and off a couple of times so you can hear the difference. The noise I'm worried about is the consistent, unwavering harmonic sound. The chattering doesn't concern me much right now.
Posted 04 August 2007 - 07:32 PM
Posted 04 August 2007 - 07:48 PM
Off I go...
Posted 04 August 2007 - 07:54 PM
If you already gave it a few squirts and it's still doing it, then I either wouldn't worry about it or you may need to take the iacv off to examine it (but beware it has a gasket that needs to be replaced if you remove it). Some chunk of dirt or a flake of something might've gotten down in there and is acting like a whistle or reed for a musical instrument.
Posted 04 August 2007 - 08:08 PM
Is it as complicated to remove as it looks at first glance, or is it just because there's a bunch of hoses and wires and stuff?
Posted 04 August 2007 - 08:12 PM
Another idea might be to get a shop vac down in near that hole and see if it'll suck out any particles or chips. I'm guessing, that if it wasn't making this noise before work was started, and it is making noise now, that something might've gotten down in there.
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