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

[Jeff Greenfield (coyote]

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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