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 Post subject: Extreme intake whine
PostPosted: Mon Aug 20, 2018 6:33 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
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Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
Working on my '97 again... finally.

What I'm looking at first is the extremely loud intake whine noise. It's so loud you can't pinpoint it to anything external. You can hear it loudest directly at the intake with the filter off, and under the oil cap.

My first thought was something in the PCV is messed up. My recollection is that this complete motor came from a wrecked '02. So far I've identified an idle quality issue with the MAS connected, makes me think massive vacuum leak or something like that. Pulled the PCV valve and throttle body thus far, no luck finding anything that looks wrong.

I'll be working on this one tonight, tearing the top end off in hopes of finding something, but anybody have any other ideas?

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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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 Post subject: Re: Extreme intake whine
PostPosted: Mon Aug 20, 2018 7:12 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
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Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
Well, I found a vacuum leak path at the supercharger plenum gasket. Not sure how the noise was being transferred into the crankcase yet.

_________________
Blow all the things! Wait, I meant boost. Boost!
Image

Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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 Post subject: Re: Extreme intake whine
PostPosted: Tue Aug 21, 2018 11:29 am 
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Joined: Wed May 13, 2009 10:45 pm
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Location: CHICAGO
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
Just reading this now, I was gonna surmise a vacuum leak somewhere.

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2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

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 Post subject: Re: Extreme intake whine
PostPosted: Wed Aug 22, 2018 8:26 am 
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Joined: Tue May 27, 2008 8:53 am
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Also check the o-rings on the pcv to make sure they are doing what they are supposed to be doing.

Does the engine react to the oil cap being taken off?

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 Post subject: Re: Extreme intake whine
PostPosted: Wed Aug 22, 2018 3:40 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4420
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
I've been cleaning up parts to re-do the paint with PC, had to take a lot of stuff apart. Aparently the aluminum primer I used when I painted didn't like the cast aluminum, it had started flaking really bad already. Everything else was fine, but I figured while I have everything apart I should fix that.

One other person has confirmed that the most likely culprit at this point is the vacuum leak at the plenum. Not sure what exactly generated the noise, perhaps the plenum gasket itself was 'flapping' or something? Once I finish cleaning and powdercoat everything I'll put it back together and see if that fixes it. Opening the oil cap wasn't enough of a magnitude factor to notice if it helped/hurt the idle. Unplugging the MAS made it idle rock solid, which I figured means step one: Fix the major vacuum leak.

Next up is the transmission. Seems like it's starting out in either 2nd or 3rd (not sure which yet - I keep begging people to bring a tech 2 to the meets!), and reverse works. In my mind that means the computer doesn't like something and is running in some sort of limp home mode. Trans is a fresh rebuild, I would think that if 2nd gear is working and reverse is working that mechanically/hydraulically speaking that means 1st, 2nd, 4th, and rev all work and I can't think of any reason why 3rd wouldn't be working. I really need a scanner to see what transmission codes, if any, are being set that would explain the behavior.

Also working on quieting down the exhaust a bit. It's just too loud as it is lol.

_________________
Blow all the things! Wait, I meant boost. Boost!
Image

Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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