You have a small demon in your intake manifold. Whenever you connect the vaccum line to your rocker cover, that screeching is the sound of the demon trying to suck out the 4AGE's machine soul.
Curious if anyone know what might cause this.
When the cylinder head cover outlet is connected to the intake manifold (vacuum) a whining sound starts up.
To counter this from occurring i installed a mini air filter for the cylinder head outlet which stopped the whining sound.
The sound only occurs when the cylinder head outlet is connected to vacuum. Interesting when the engine is turne off; the sound slows/or fades out, suggesting that the sound is a result of a moving part.
Does any know what is the cause of this.
You have a small demon in your intake manifold. Whenever you connect the vaccum line to your rocker cover, that screeching is the sound of the demon trying to suck out the 4AGE's machine soul.
You can have any brew you want... as long as it's a Datsun / Corolla / What is that?
Ah ok, I though it could have been a 'whining bitch'......
Any advances on supernatural beings in my engine being awoken by vacuum?
spun a big end
do u have a pcv valve in there
I didn't think 16v's came with a PCV. I didn't put one in so, no it doesn't have a PCV.
its definetly a vacumn leak....
i would think that there is a leak in the throttle body gasket or something similar.
when you disconnect the hose to the manifold, there is an easier path for the air to go into the engine, so the vacumn leak is not evident.
but when you reconnect the hose, air will try to get into the engine anyway it can....so the vacumn leak becomes evident.
what you should do is leave the hose connected, so the noise is evident, then spray wd40 around any areas that could have a vacumn leak ie throttle body gasket, inlet manifold gasket.
if the revs pickup or the noise goes away when you spray in that area, then you have found the problem
(the sound fading out would be an indication that the enigne is sucking in air as it stops turning)
can also be the vaccuum being dragged around your TB. have had this before in other car's
i had the same problem, thought it was my pcv, so ripped the inlet manifold off and put quads on it, but 2nd what slide86 says, it was a vac leak on mine but i never could find it b4 i did my conversion, but i used to spray brake kleen into the pcv whilst it was making noise and would stop for a while, and reoccur when it got really hot
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<div class='quotetop'>QUOTE (race4ages @ Apr 5 2008, 05:58 PM) </div>You might find one of your idle up solenoids has its air lines back to front. I had this once on an air con idle up and it made the noise. Swappd it around and hey presto - silent. They were only made to work (competently) one way.
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