IML DIGEST

["Ernie Stepney" <estepney@xxxxxxxxx>]

Bruce
Vacuum leaks usually cause rough idle problems, not backfires. They are
normally caused by an excessively lean condition. Most likely places to
look are a weak accelerator pump or sticking metering rods. Hope this
helps. The fitting at the booster is mounted in a rubber grommet, push
fit.  Ernie


-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Bruce
Stubblefield
Sent: December 9, 2003 6:00 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: IML DIGEST


Hello List!
     In my quest to find and eliminate possible vacuum
leaks in the mighty '78 NYB, I have found one at the
parking brake vacuum release canister.  Fixed that. 
Plugged the hose up for now, actually.  The carb is a
rats nest of vacuum ports going who knows where.  Is
there a vacuum guage-type tool that I could use to
look for leaks?  
   Also, a large vacuum hose goes directly from the
intake manifold to the power brake booster.  The
fiitting at the brake booster(where another vacuum
line exits and continues on) is a small cylinder
sticking out of the front end of the booster with two
vacuum line port/fittings.  
This fitting doesn't jiggle like it's loose, but it
does TURN.  Does anyone know if this is right, or
should I suspect a vacuum leak at the brake booster? 
Do I need to remove the vacuum hoses at this fitting
to see how MUCH it turns?
   BTW, the symptom I'm seeing is a "backfire" out of
the top of the carb when I punch the gas if the car is coasting(engine
under no load).  If I punch it hard enough and I'm going slow enough,
the engine just dies.

Thanks everyone
Bruce S
69 coupe
78 NYB
     

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