Ferrari Mailing List: Re: Vacuum valve by-pass: What does it do ?

[Stephen L Sherman (stephensherman44]

Have checked the vacuum hose?

Stephen 

Sent from my iPad

On Sep 17, 2015, at 6:55 PM, Sport Classic Comp <wade [at] sportclassiccomp.com> wrote:

Yes it could cause small backfires it controls mixture upon deceleration

Wade

Sent from my iPhone 7 with Mind Erase Technology

On Sep 17, 2015, at 6:34 PM, mysavard [at] videotron.ca wrote:

 So, if that part is malfunctioning (my mechanic told me it is not working anymore), can this be the cause of my backfires ?  It's been going on for 2-3 years and I changed A LOT of parts to solve the problem- I even wrote about it 1-2 years ago to the list. I get very small backfires when I'm driving at a regular rpm (3000 to 4000) in second and third gear when stuck in traffic. As long as I keep the rev going up, it's no problem. But if I'm stuck and keep the rev at a steady number (anywhere between 3000 and 4000) in 2nd or 3rd, rarely happens in 4th, never ever in 5th.  Then the very small backfires happen.

 

It's a very very expensive part. But if that's what it takes, then......................

 

Michael Savard

 

 

Le 17/09/15, Sport Classic Comp <wade [at] sportclassiccomp.com> a écrit :

it functions like the auxiliary air valve, but is controlled by intake vacuum instead of temperature, essentially it would help prevent excessive lean out with higher vacuum.

 

 

 

----- Original Message -----

From: Michel Savard

To: Wade

Cc: The FerrariList

Sent: Thursday, September 17, 2015 4:56 PM

Subject: [Ferrari] Vacuum valve by-pass: What does it do ?

1981 308 GTSi: What does a Vacuum valve by-pass do ? (tav 12 #34 part number 115741)

What happens when it's not fonctionning anymore ?

Ricambi has it for $445 u.s., Eurospares has it for 135 pounds.

 

Michael Savard

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