Engine makes screeching sound

[riceburner]

There is a bypass line built into the inlet manifold on the inside that runs to the throttle body. If your throttle body gasket doesnt have the right holes punched into it you block the bypass off and apply full manifold vacumm to the engine.

When this happens you are applying negative pressure the entire engine, hence why the noise isnt there with the hose disconnected. The noise you here is air being sucked INTO the engine either thru oil pump, oil filter location or anywhere like that.

What manifold does you have, bigport rwd, fwd converted??

Your sound isnt a moving part, the release/normalization of pressure when engine turned of is the fade out noise.

This is what happens to me and hundreds off others that went to a rwd converted fwd manifold.

Easiest thing to do (if you have a fwd>rwd manifold) is run a t piece off camcover to manifold line and attach it somewhere before the throttle body. You may need to fiddle with idle after doing this.

If you have a rwd manifold then either do the same as fwd>rwd or pull your throttle off and punch all the holes into the gasket. clean your throttle body while your there.

[JoshKE]

I had a high pitch noise coming out of mine when I first put it in, turned out to be a small fold in the gasket on the manifold side of the throttle body, so I guess thats another vote for vacuum leak

[verm69]

<div class='quotetop'>QUOTE (Javal @ Apr 5 2008, 07:33 PM) </div>
listen to Javal. Ignore everyone else's advice, they obviously don't know ANYTHING about engine's...


It's a common problem. I solved it by using Holly water in my fuel, putting 2 garlic cloves in my air filter and sacrificing a virgin black cat on my rocker covers... short of that, try leaving the bible under your hood while driving as a temporary fix...


i'm serial

[biggo]

i must get my car blessed before the demons torment it to death

out of curiosity how much was the virgin black cat?

[verm69]

Black cats in general are pretty cheap, but a virgin one wasn't cheap... and i got an extra big one just in case


pretty sure it was about $230... witch is expensive for a cat

[Wezelton]

so about 4 chickens 3 goats and a cow in the old money?