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

[Matt Boyd (ferrari308driver]

Please keep discussing this, I have the same symptom in my qv.... Not loud backfires though, just small pops out burbles. How does one diagnostically test the bypass valve?

Matt
85 euro 308

On Sep 19, 2015 2:15 AM, "Peter Rychel" <dino308gt4 [at] hotmail.com> wrote:

Try AllFerrariParts.com (used to be Dennis McCann, but now is owned by Tom Vail). It's been a while since I bought from them, but they have/had a great stock of NOS-OEM stuff at very competitive prices.

Try also Maranello Classic Parts in UK (ferrariparts.co.uk)...

Peter

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From: mysavard [at] videotron.ca
Date: Thu, 17 Sep 2015 21:47:54 -0400
Subject: Re: [Ferrari] Vacuum valve by-pass: What does it do ?
CC: ferrari [at] ferrarilist.com
To: dino308gt4 [at] hotmail.com

You wrote "it could cause small backfires it controlls mixture upon deceleration". Yes that's exactly when it happens. Deceleration and steady rpm speed in 2nd, 3rd and sometimes 4th.

I guess I'll get the part. So far the cheapest one is 135 pounds from Europspares. I'll keep shopping.

 

Thank you all !

Michael Savard

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

From: Sport Classic Comp

To: mysavard [at] videotron.ca

Cc: The FerrariList

Sent: Thursday, September 17, 2015 7:55 PM

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

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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