[DML] Re: Strange noise in enginebay

["content22207" <brobertson@xxxx>]

Everything forward of engine takes vacuum from 3/8" nipple on
passenger intake rail. Cap it first to determine if leak is in fact
what you're hearing (remember brake booster uses same line -- you may
want to diagnose in place).

If capping nipple stops sound, you'll have to further isolate actual leak.

HVAC control knob routes vacuum to various vents & doors -- it can
leak anywhere from knob to diaphragms at other ends. Is also a very
small line back to heater core shutoff valve. If your climate control
system is misbehaving (center vents don't work, circulates outside
rather than inside air, etc) this is most likely problem.

Power brake booster is isolated from passenger compartment by an inch
or so of foam, but sound might penetrate. Is a big line -- if it's
leaking you should also have idle problems.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "michael townsley" <townfour@xxxx> wrote:
> I have a hissing sound in the cabin....that I especially notice when
I pull
> the car into the garage.....I thought it was coming form the a/c control
> area but it may be something else. Other that the heater hose
technique are
> there other ways to detect or isolate vacuum leaks?
> 
> Michael W. Townsley, Principal
> Townsley Consulting Group, LLC
> 2 Fox Hill Road
> Old Saybrook, Connecticut 06475
> 860 304 2412
> townfour@xxxx
> 
> 
> -----Original Message-----
> From: Jim Reeve [mailto:ultra@xxxx] 
> Sent: Monday, June 09, 2003 10:54 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Re: Strange noise in enginebay
> 
> In addition to the idler bearings, you might also want to check the 
> condition of the seals for the fuel injectors. On the way to 
> Memphis last year an owner had the retaining clip pop up, and the 
> seal unseated slightly, resulting in an ear piercing whistle of a 
> vacumme leak. I have also noticed a lesser form of this whistle on 
> a Maryland owner's car, and even my own 4 weeks ago when the engines 
> were cold. Just another thing to check.
> 
> Jim Reeve
> MNDMC - Minnesota DeLorean Club
> DMC-6960
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, Jan van de Wouw <jvdwouw@xxxx> wrote:
> > Hi,
> > 
> > While driving this afternoon all of a sudden I heard a strange
> > noise from the back, it sounded like a sort of "shrieky whistle"
> > and increased with giving more throttle.
> 
> 
> 
> 
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