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Discussion Starter · #1 ·
Alrighty. So, a few months ago I was driving home from work and decided to pass someone and all the sudden I hear a very loud high pitched squeal coming from my drivers side. Somewhere in the middle of the dash area coming from the engine. I literally thought there was a rat or something that was being squished by something somewhere in my engine. It only happens when I push the gas pedal hard and the rpm’s jump to about 3k. Once I hit about 3k, it continues and doesn’t stop until I let off of the gas. It happens at 3k ish rpm’s if I hit the gas pedal hard from a stop. But if I am normally driving and hit 3000rpm it doesn’t do it, it is pretty much just when I hit boost or when the engine has to push harder to move forward, such as up a hill. Now, it’s been a few months and still does it. I just replaced the brake booster vacuum hose today, which had a leak in it, but it still does it. When it does it, the car gains power right before it starts and then once it starts to squeal, the power isn’t necessarily lost but it just refuses to increase as much as it should. I’ve only had the car for about a year and a half and it’s been happening for the last maybe five or six months. Like I said, I have no clue what’s wrong with it. I took it to the vw specialists in my area and they said it was the brake booster, but I have a absolutely no trouble braking and there has been no change in the brake performance. I don’t experience any of the other symptoms of a bad brake booster either. The engine is completely stock. It sounds like it comes from around the brake booster area but I haven’t noticed any loose clamps, leaks (other than what I replaced today), or anything else. It only happens when I’m driving, if I am in park or neutral it will not do it.

general info about my car:
2001
AWV engine code
1.8t
GLX
73000 miles
Automatic

If anyone has any suggestions, I greatly appreciate it.

Video of the noise
 

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We cannot access the video (not setup for "public" permissions?); you might post it to youtube and then, give us a link... thanks.

PS: sometimes, a diverter valve for the 1.8T; will make a squealing sound or high pitched noise, if it has a vacuum leak in it.

 

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Discussion Starter · #3 ·
We cannot access the video (not setup for "public" permissions?); you might post it to youtube and then, give us a link... thanks.

PS: sometimes, a diverter valve for the 1.8T; will make a squealing sound or high pitched noise, if it has a vacuum leak in it.


Here is a different link. Let me know if it doesn’t work again. And I will look into the diverter valve, thank you
 

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Discussion Starter · #5 ·
Still getting a "You need access" error message; upload ti yourube, for easy sharing.


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yeh I realized it wasn’t working either. I went ahead and uploaded it to YouTube. I edited the original comment with the YouTube link but here’s the link again


Sorry about that haha
 

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Yeah, if the noise, is specific; to when the boost kicks in, i would check boost related issues starting with the diverter valve and other boost related hoses, etc.


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Did you go with a stock vw replacement boost hose or aftermarket silicone type? I've been trying to figure out if the aftermarket silicone version for the 1.8T Golf/Jetta; is the same shape or will work on the New Beetle 1.8T? Many hoses on the New Beetle are shaped differently; then the Golf/Jetta, while some are similar or the same.


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Discussion Starter · #10 ·
Did you go with a stock vw replacement boost hose or aftermarket silicone type? I've been trying to figure out if the aftermarket silicone version for the 1.8T Golf/Jetta; is the same shape or will work on the New Beetle 1.8T? Many hoses on the New Beetle are shaped differently; then the Golf/Jetta, while some are similar or the same.


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I use this replacement:
 

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Did you test the diverter valve? If the boost hose is split; you can wrap it up with tape, as a temporary fix, until you order a new one and install it. VW seems to be the typical supplier for a rubber version; unless, you can find a aftermarket rubber or silicone version.
 

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Discussion Starter · #15 ·
Did you test the diverter valve? If the boost hose is split; you can wrap it up with tape, as a temporary fix, until you order a new one and install it. VW seems to be the typical supplier for a rubber version; unless, you can find a aftermarket rubber or silicone version.
I have not done any specific test on the DV. How would you do this test? I looked around in the hosing near and connecting to the DV, but could not find any cracks/splits. Everything looks solid but I might try spraying soapy water on the hoses while it's running to see if I can find anything. I've heard that works for some people.
 

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Discussion Starter · #17 ·
Check the video; i posted above, for diverter valve testing info.


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Alrighty so I finally got around to testing the dv. It doesn’t hold any vacuum so I will be ordering a new one this week if I have enough money. But when I pulled it out there was some sort of fluid around the pieces that the hosing connects to. Is this normal?
 

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Solid, testing! :) It is always nice, when you have a confirmed diagnosis, that have been proven with testing results.

For the diverter valve; stick with oem, if you are using stock parts, VW's DV oem previously was made by Bosch and then, the last one I bought was by Kayser. These tend to get tired with age and heat, can cause them to warp, stick. So, you might consider, getting it from fcpeuro; which offers a lifetime warranty, on all the parts they sell, free shipping over $50 order. Looks like FCPEURO, is currently selling; genuine vw and VNE, a German company I am not familiar with, you might contact them and see, if they still sell the Kayser brand.


06A145710N



Keep in mind, VW tends to change oem manufacturers; from time to time, so VNE, might be a new one for VW, you might contact FCPEURO about them and confirm, the quality of the part. NOTE: it says that the part is "MADE IN GERMANY"; so, you would assume it is a quality part but I haven't heard much feedback about VNE, so far.
 

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As to the oil residue; your boost was passing through the bad valve and so, that makes sense. Excess, motor oil, tends to build up in the piping and intercooler overtime. I removed my intercooler, lower hoses and cleaned them out, degreased, pressure tested it for leaks (mine was ok) and it seemed to help my boost performance a bit.
 

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Discussion Starter · #20 ·
As to the oil residue; your boost was passing through the bad valve and so, that makes sense. Excess, motor oil, tends to build up in the piping and intercooler overtime. I removed my intercooler, lower hoses and cleaned them out, degreased, pressure tested it for leaks (mine was ok) and it seemed to help my boost performance a bit.
oh okay. makes sense. thank you :)
 
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