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Old 05-28-2019, 08:18 PM   #1
Marvelous3
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Default My 16 valve car will sing you a song

So yeah...

https://www.facebook.com/themattmill...056516680/?t=5

Things I have checked:
I have disconnected each of the vacuum lines going into the intake one at a time. Still sings.
I pulled out the IAC valve and inspected it and the hoses for it and they all look fine.
Disconnected vac line on the FPR. Still sings.
Sprayed maf cleaner on the injectors with it running with no change in idle.
The car runs a catch can that is connected to the black box for the PCV. I have cleaned out the catch can. Ran the car with the catch can completely off. Sings. Ran with the catch can reattached. Sings.
Removed the AC/Powersteering/Alternator belts. Still sings.

The sound is coming from the area around intake runner 1/idler pulley/DSM CAS. If I go drive it and give it throttle the sound is less/goes away. As soon as I get to a stop light or let the car coast down the road it sings. I'm kind of at a loss. Anyone run into this before? Wtf brah?
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Old 05-28-2019, 08:43 PM   #2
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Intake manifold gasket?
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Old 05-28-2019, 08:46 PM   #3
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Mine made a sound like that when the throttle body gasket was leaking vacuum. The gasket was vibrating like a reed. Spray water or something around the intake and TB gaskets.

https://www.youtube.com/watch?v=NrMrNCXa0eI
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Old 05-28-2019, 09:00 PM   #4
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Originally Posted by wennstroma View Post
Mine made a sound like that when the throttle body gasket was leaking vacuum. The gasket was vibrating like a reed. Spray water or something around the intake and TB gaskets.

https://www.youtube.com/watch?v=NrMrNCXa0eI
It says your video is unavailable. Do you have it set to private?
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Old 05-28-2019, 09:20 PM   #5
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It says your video is unavailable. Do you have it set to private?
It was set to private for some reason. Switched it to public.
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Old 05-28-2019, 09:34 PM   #6
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It was set to private for some reason. Switched it to public.
LOL that sounds exactly like mine. What'd you do, replace the throttle body gasket and it went away?
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Old 05-28-2019, 09:44 PM   #7
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Sprayed maf cleaner on the injectors with it running with no change in idle.
i imagine that'd tell you it's a contact squeal rather than an air leak.
try putting some already-foamy soapy water in the area? that would hopefully blow bubbles wherever it lands if it's air-related
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Old 05-28-2019, 10:06 PM   #8
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LOL that sounds exactly like mine. What'd you do, replace the throttle body gasket and it went away?
Yes, new gasket and it was fine. Once you find it just make sure the flanges are flat and there is no old bit of gasket or something in there.

Mine was a new 960 TB gasket that was taped onto the manifold with masking tape for shipping, the tape peeled off a tiny layer of the gasket and made it leak there. It was an early NIW manifold, and the TB flange also had a low spot from a roloc wheel or something, so I filed that out too.
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Old 05-29-2019, 03:17 PM   #9
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i imagine that'd tell you it's a contact squeal rather than an air leak.
try putting some already-foamy soapy water in the area? that would hopefully blow bubbles wherever it lands if it's air-related
it'd suck soap at idle, probably be difficult to tell.
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Old 05-31-2019, 04:05 PM   #10
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it'd suck soap at idle, probably be difficult to tell.
Yuh, soapy water is to make sure you don't blow up yer gas grill.
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Old 05-31-2019, 08:57 PM   #11
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I ordered a new throttle body gasket and intake manifold gasket in addition to the valve cover gasket I've been needing to fix anyways. Should be here in a few days and we'll see if that fixes it.
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Old 06-09-2019, 11:36 PM   #12
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https://youtu.be/cyAWD8BmraI

Mine did the same thing and it was the TB gasket. The flange got a little warped during welding.
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Old 06-10-2019, 12:23 AM   #13
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I'm waiting for the gasket to show up from Tasca. It's supposed to be here tomorrow so hopefully that fixes things.
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Old 06-11-2019, 07:03 AM   #14
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If you ever get tired of throwing parts at vacuum leaks, you can make yourself a smoke machine pretty simply/cheaply. Just hook it up to the intake system and see where the smoke comes out. I would recommend getting real automotive smoke machine liquid so you don't hurt the o2 sensor, however.
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Old 06-18-2019, 03:27 PM   #15
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If you ever get tired of throwing parts at vacuum leaks, you can make yourself a smoke machine pretty simply/cheaply. Just hook it up to the intake system and see where the smoke comes out. I would recommend getting real automotive smoke machine liquid so you don't hurt the o2 sensor, however.
Will that stank smoke hurt an O2 sensor in the minute or two it is in exhaust?

I know for sure that the smoke used on the intake side won't! Lol

I have a smoke machine and can attest to it's usefulness in finding PITA pinhole leaks quickly. I just wish that it could apply more pressure to find leaks that don't show themselves before 20+ PSI. Tiny leak grows to a big one at 20psi
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Old 06-18-2019, 08:25 PM   #16
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Will that stank smoke hurt an O2 sensor in the minute or two it is in exhaust?

I know for sure that the smoke used on the intake side won't! Lol

I have a smoke machine and can attest to it's usefulness in finding PITA pinhole leaks quickly. I just wish that it could apply more pressure to find leaks that don't show themselves before 20+ PSI. Tiny leak grows to a big one at 20psi
It's theoretically possible. The real stuff is pretty cheap so I tend to use it.
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Old 07-24-2019, 03:22 PM   #17
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Some follow up here now that I’ve got it fixed.

First thing was that the existing throttle body gasket was just some Grey rvt which had worn itself away. So I put in a Volvo gasket. This quieted it down some but it still whistled.

The other was that some of my intake manifold bolts weren’t as tight as they could have been. Tightened them up and the noise is gone.
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Old 07-25-2019, 09:27 AM   #18
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Some follow up here now that I’ve got it fixed.

First thing was that the existing throttle body gasket was just some Grey rvt which had worn itself away. So I put in a Volvo gasket. This quieted it down some but it still whistled.

The other was that some of my intake manifold bolts weren’t as tight as they could have been. Tightened them up and the noise is gone.
don't hate on the instagasket.
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Old 07-25-2019, 01:25 PM   #19
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don't hate on the instagasket.
Haha nah man it held on for a long time. It probably seals better than the paper gasket but is more messy.
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