wicked squeaks, possibly TPEFI related

[Clare Snyder]

>Dope!! When I got this engine out of the '89 Formula one Fire bird, it had
>two PVC valve looking things in the valve covers. I broke one while
>installing the motor and assumed it was a PVC valve and replaced it with one
>identical to the remaining valve.
>
>If you are sure this is not a negative pressure crankcase, this must be the
>problem. A bright ray of sun light shines on my bald spot, but it begins to
>dim! 
>
>I used all of the original air ducting and air cleaners from the Fire Bird.
>There are no "before MAF connections", that I'm aware of on this setup, that
>could serve as an engine vent. My 3.8PFI set up does have one after the MAF
>and no PVC at all. 
>
>Presently, I have the driver side PVC valve connected to the fitting at the
>base of the TPI manifold also on the driver side. The passenger side valve
>is connected to the fitting at the back driver side of the plenum.
>
>Since a negative pressure crankcase is a no no, I will remove the second PVC
>valve and add a vent with it's own filter. I hate to imagine the damage I've
>done to the seals and sealing surfaces not to mention the dirt that has been
>ingested.
>
>Thanks to all that responded.
>
>GMD
>I was begining to think that this motor was the most leak free I had ever
>owned! Oil can't leak out of a vessel under vacuume.
>
>
>At 12:54 PM 9/17/97 -1000, you wrote:
>>
>>
>>----------
>>> I've got a weird one here. Every one I've asked so far has been stomped. I
>>> drove my '89 5.7L TPI '58 chevy truck to Atlanta last weekend, 100mph
>>> plus...420 miles one way from my home...so I'm perty sure it's not a
>>> mechanical engine noise. The following is what I know. I think it's the
>>EGR
>>> valve or diaphragm resonating.
>
>>Sounds like you're developing vacuum in your crankcase, which is a no-no. 
>>You said that you checked BOTH pcv valves, but the crankcase ventilation
>>system is designed to have ONE pcv valve and one vent tube to the filtered
>>side of the intake line.  Try removing one pcv valve from the valve cover
>>while the engine is running.  If the squeak dissappears, vent your
>>crankcase and remove the redundant valve.
>George M. Dailey
>gmd at tecinfo.com
>
>
Eureka!!! You have just discovered the cure for British Car Hemmorage!!!!!
Look ma, no leaks!!!!