Ferrari Mailing List: Re: 328 fast idle question--hit a bump?-reply

[Doug and Terri Anderson (dnt]

Hey Jeff - about the best tool you added  - the smoke machine - - - you gots 
that right.  In Kalifornia, there is an LPFET - low pressure fuel evap test 
done on every, just about, 1976 to 1995 car for the smog test.  AHHHmazing 
how many shops can only guess - at the customers expense, where the leak is 
if it fails.  The ESP/Waekon LPFET tester has a smoke machine diagnostic 
tester option.  Fire that puppy up and 29 seconds find the leak(s).  Some 
cars are like a sieve.  heh heh
DOUG

----- Original Message ----- 
From: "Jeff Greenfield" <coyote [at] acme-ltd.com>
To: "DOUG" <dnt [at] dock.net>
Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
Sent: Sunday, September 28, 2008 1:18 PM
Subject: Re: [Ferrari] 328 fast idle question--hit a bump?-reply


> The idea is to spray carb cleaner around various hoses and
> connections  looking for a surge in idle indicating a leak.
>
> Works better in theory then in practice. I've never found it to be
> reliable or accurate.
>
> A much better way is to use a smoke machine. Basically you inject
> smoke at a very low pressure into the intake, and If any escapes
> you'll see the source and it will lead you to the leak.
>
> My smoke machine is one of the best tools I've ever bought for the
> shop, but they are a little too pricey for a DIY home garage.
>
> www.redlinedetection.com
>
> Although I haven't tried it, I do have plans that came from a reliable
> source that show how to build one. If anyone wants the file email me
> off-list I'll send it along.
>
> Jeff
>
> Sent from my iPhone
>
> On Sep 28, 2008, at 1:21 PM, LtWacko <ltwacko [at] aol.com> wrote:
>
> > I haven't done it in years, but someone remind me.  Can't you spray
> > WD-40 or something around the hoses and intake looking for the
> > leak.  The idea is that the engine will ingest this and affect the
> > idle.  Again, I haven't had a car in years that needed this test.  I
> > usually did something stupid that required its replacement first.
> >
> > Rodney
> >
> >
> > In a message dated 09/28/08 05:16:30 Central Daylight Time, 
> > ferrari-request [at] ferrarilist.com
> >  writes:
> > Date: Sat, 27 Sep 2008 15:20:36 -0700
> > From: "Doug and Terri Anderson" <dnt [at] dock.net>
> > Subject: Re: [Ferrari] 328 fast idle question--hit a bump?-reply
> > To: "Robert Rehkopf" <CaptRehkopf [at] Comcast.net>
> > Cc: 'The FerrariList' <ferrari [at] ferrarilist.com>
> > Message-ID: <001901c920ef$473889d0$b025f0d8 [at] YOUR6EA8154886>
> > Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> >  reply-type=original
> >
> > Sounds nice Robert - um, the plenum is the big ribbed aluminum air
> > box atop
> > the intake trumpets.  Center of the engine bay with the big 3 inch
> > air hose
> > going to it from the CIS fuel metering device.
> >
> > There are two hoses, I believe, coming off the left side and one big
> > one
> > from the front.  This front one goes to the additional air valve -
> > [left
> > side and used at warm up time - at the front - front is towards
> > front of
> > car - of the plenum is also a fuel hose from the injector
> > distributor.  This
> > spritzer should have a wire going to it.  When first starting up the
> > fuel
> > gizmo receives a signal to richen up the fuel mixture and it
> > spritzes fuel
> > into the plenum - a very rich mixture - and the air valve allows
> > additional
> > air in to make up the correct mixture.  As the engine warms up the
> > additional air valve closes off.  Sayyy - the air valve should have
> > a wire
> > going to it too - make sure it is firmly attached]
> >
> > Sometimes, on a CIS engine, a loose oil filler cap will cause the
> > engine to
> > hunt - so will a loose dip stick.  Tho it doesn't sound as if this
> > is your
> > problem.
> >
> > This year CIS should have all sorts of rubber hoses - and as one
> > fellow
> > lister, Ed, said they are 20 years old, probably pretty stiff lot.
> > Therefore prone to crackage (highly technical term).  Just follow
> > each hose
> > with your hands and lightly tug and wiggle.  I have pictures of
> > hoses nested
> > way down in the engine that had the bottom crack off in big
> > elliptical moon.
> > Ayep - two pieces.
> >
> > This outcome happened as a result of a shock event - what ever it is
> > - the
> > culprit was probably just waiting to surprise you.
> >
> > Onward and keep us informed.
> > DOUG
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