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Matt, your qv does not have that by-pass valve, or
it shouldn't. the mixture is controlled within the fuel distributor.
Sounds like to me you have leaking fuel injectors.
We have had a lot of cars come in here with many
different types of problems all related to the fuel system.
I have invested a lot of time and money tracking
down old school machines so that I can test and rebuild fuels systems like they
did in the 80's We are achieving some phenomenal results when we
clean fuel injectors
replace vacuum hoses
replace fuel hoses
rebuild fuel distributors
rebuild all electro valves
evap test the engine for any leaks (smoke
machine)
and tune via 5gas analyzer, and we get even better
results if your analyzer tubes are still in place then we can tune each
individual cylinder.
We did this to an 84 Euro 308 recently and the
results were astounding, the owner calls me once a week to tell me how dialed in
his car is.
These cars are 30 + years old and most guys are
doing maintenance in a needed basis, everyone who has a 308/328 boxer etc.
needs to go through the entire fuel and evap system on the car, you will
see a noticeable difference we certainly are and when I say noticeable I'm
talking about increases in HP, most of these cars the cam timing is retarded
from the factory to meet emissions standards when we degree the cams you can
feel it when you drive the car.
Wade
----- Original Message -----
Sent: Saturday, September 19, 2015 5:42
AM
Subject: Re: [Ferrari] Vacuum valve
by-pass: What does it do ?
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
From: mysavard [at] videotron.caDate: Thu, 17 Sep 2015 21:47:54
-0400 Subject: Re: [Ferrari] Vacuum valve by-pass: What does it do
? CC: ferrari [at] ferrarilist.comTo: 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 -----
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
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 -----
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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