Re: [DML] Vacuum related squeal

[Mike Substelny <msubstel@xxxx>]

L Sandel wrote:

> Greetings list,
>
> I have developed a rather annoying vacuum related squealing/whistling
> sound... It is difficult to pinpoint, but seems to be coming from in back
> of the engine. I checked out as many of the vacuum connections as humanly
> possible, but haven't been able to track down the culprit. It seems to only
> happen after the engine is warmed up.

Check the bolt that attaches the throttle shield. Believe it or not, that bolt
hole actially leads inside the intake. This bolt MUST be in place and tight!

If this is not the location, you can use a stethescope or syphon hose to locate
the source of the noise. With the engine running, press one end of the syphon
hose to your ear and the opther to the engine block. Then press it to another
part of the engine block. If the noise gets louder, then you are getting closer
to the leak.

> So, has this happened to anybody before?

Yes, it happened to me the day before I drove to DOA Nashville Expo, right after
I bled my cooling system. I had not tightened the aforementioned bolt
sufficiently. My DeLorean would run, but that squeeling sound scared the
bejeezus out of me!

- Mike Substelny
VIN 01280, 8 years