What's this demonic noise? Options

[Amphicar770]

I posted this in my build thread but since that has gotten kind of long, wanted to also call it out as a seperate topic.

I'm really starting to think I should not be allowed within 59 ft of a wrench.

Went to set timing. No visible marks in fan so I chock one wheel and turn the other with a stick in cylinder # 1 to get to TDC. Confirm that flywheel Mark is at top, I can feel it by reaching around. I mark the fan with whiteout, put spark plug back in and start car. Forgot it is still in 5th but it's on stands so it just kicks out the wheel chock. But wait, now there is some kind of a whine / squeal type sound. Hard to pinpoint but I think it's from engine compartment. Thinking it is the AC belt I first tighten then remove entirely. No use. You can hear what I am talking about here.

http://www.youtube.com/watch?v=tS0hHENOWPw

Feeling like every step forward results in two steps back.

[stugray]

Its a long shot, but I have had a similar noise on TWO 914s when the starter motor remains engaged after the engine is started.

Both times were because the ignition switch was keeping power applied to the solenoid after you (supposedly) released the key.

I dont recall it being such a high frequency noise though.
Unrelated question: why is the idle so high?

[BeatNavy]

Unrelated question: why is the idle so high?

I believe that's why he was checking timing - to see if that's what's causing the high idle.

Also a longshot: the only time I ever heard something like that was when there was a big leak at the plenum. Specifically, I had installed the throttle body on the plenum without realizing the washer was underneath, not on top, of the throttle body. It caused a very high idle and a hideous turbine-like sound as it pulled air through the gap between throttle body and plenum.

So in addition to looking for something rubbing also look for a problem with intakes/throttle. Air being sucked in rapidly can cause loud, strange noises (and a high idle).

[Amphicar770]

Unrelated question: why is the idle so high?

I believe that's why he was checking timing - to see if that's what's causing the high idle.

Also a longshot: the only time I ever heard something like that was when there was a big leak at the plenum. Specifically, I had installed the throttle body on the plenum without realizing the washer was underneath, not on top, of the throttle body. It caused a very high idle and a hideous turbine-like sound as it pulled air through the gap between throttle body and plenum.

So in addition to looking for something rubbing also look for a problem with intakes/throttle. Air being sucked in rapidly can cause loud, strange noises (and a high idle).

Aww c'mon, what kind of a noob would do something like putting the washer between the tootle body and the plenum. I mean really, um, uh, uh oh!

Yup, guess what I just checked and was indeed the problem. Exactly what you described.

Mega thanks. (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/pray.gif)