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Old 08-16-2011, 05:08 PM   #1
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This one has me stumped, noise on throttle let off

Hello folks,
It has truly been a while since I have posted here in any capacity. Everything works great, which is exceptional for 181,000 on the clock. Here's the one strange thing:

On throttle let-off, in any gear, and not every time, I get a "hooting" noise. The noise usually does not happen after a hard acceleration, instead it shows up on light throttle lift-off before gear changes. It is obviously related to the dump valve. I replaced the dump valve, as I had the MIL come on and a code specifically for it. I figured that would fix the hooting. I was wrong.

The noise is still there. I have checked all the vac lines, smoked the intake system and checked the operation of the new valve. Everything is good.

Ideas?
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Old 08-16-2011, 05:15 PM   #2
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How are your vacuum lines? Especially the one coming off the dump valve
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Old 08-16-2011, 08:31 PM   #3
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Have you done the T7 bypass mod?
T7 Turbo Bypass Valve Mods – TrollTuner
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Old 08-20-2011, 01:13 PM   #4
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Vac lines are good, not original but definitely not new. They hold vacuum fine.

I have not done the bypass mod. The hooting sounds exactly like what I'm experiencing. Thanks SRP, I've never heard of that. I'll try it out this coming week.
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Old 09-12-2011, 02:08 PM   #5
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I did the bypass mod today, the noise is 100% worse than before. On every throttle let off, whether after WOT or easing off, the noise happens. When giving it a little gas, and then backing off quickly, the noise also happens...Everything else is tight and the CABV is new.
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Old 09-12-2011, 03:16 PM   #6
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factory valve or aftermarket?
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Old 09-15-2011, 04:47 PM   #7
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Factory Bosch valve. I thought about getting the Forge valve but couldn't justify it with our current budget and its outlook.

I had a buddy of mine ride with me last night to listen to the noise. He says it's less of a hooting noise and more like a weird sounding horn. The noise starts off "up front" but then sounds like it "takes up the whole car." I think I may swap dump valves with another friend who has an '01 9-5 Aero to see what that does. His car doesn't sound like a fog horn.
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Old 09-15-2011, 06:12 PM   #8
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The stock valves wear and get pretty loose. Mine started hooting at ~162k at part throttle, used Forge BOV (BPV in your case) fixed it up nicely.
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Old 09-17-2011, 06:00 PM   #9
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The dumb part about this is the Bosch valve is new, about one month old. I'm going to smoke the intake again this week as it's been a few months since the last time.
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Old 09-18-2011, 04:54 AM   #10
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Flip the diverter to see if it changes any. How old is the turbo, and are you running the diverter like a BOV by any chance?
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Old 09-19-2011, 08:12 AM   #11
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Turbo is original, almost 182k miles. I'll try flipping the valve around, see what happens. The car is basically stock aside from poly engine/trans mounts. No BOV as it's T7.
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Old 09-20-2011, 08:59 AM   #12
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give me a call if you want, i saw your car the other day while i was at majestic motors btw, ill take a look at it for you, 6033911409.
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Old 09-20-2011, 03:37 PM   #13
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Thanks man, I'll be going over it again at work this week and see if I missed anything. It's frustrating when you can't fix your own car but you can fix everyone else's.
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Status: Mostly OK and studded winter tires

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Old 10-02-2011, 07:30 AM   #14
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The stock valves wear and get pretty loose. Mine started hooting at ~162k at part throttle, used Forge BOV (BPV in your case) fixed it up nicely.
My stock bosch started to make pretty similar noise anytime it was closed and somtimes when it opened slowly, I thought is kinda sounded like a whale, but anyway, i replaced it with a Forge and fixed it and it seemed to hold boost better as well.
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