Removed the airbox and discovered this hole under the housing of the air sensor plate. I have not found any pipe connected to it. Be careful, this is not the hole where the pipe going to the cold start valve is connected, that hole is in the upper black housing of the air filter. Does anyone know what is about? Furthermore there is not trace of this opening in my 1983 QV spare part manual. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
I see what appears to be it, in the parts manual for my 1988 328 for non-US versions: Image Unavailable, Please Login Image Unavailable, Please Login
I will look at my 83 in a couple days. But more important is you have black spark plug boots, I thought I was the only one left.
Actually this is getting more confusing. Looking at my manual, I also have a TAV (#12) which is very similar to the yours for the 328. And I believe you think it might be the pipe #72 (the hose from by pass valve to support) but it is not, at least in my car. First of all, I have always had that pipe connected to the cold start valve (I know you do not have this valve in your 328) and plugged directly into the airbox (clamped to its proper hole and fit regularly). Actually there is no trace of this hole in the manual (should be in the TAV #13 in my case). Additionally, in your manual (and in the mine one as well) that inlet is described as "raccordo filettato" or "threaded union" (#13) but as you can see from the pictures that hole is not threaded.
There is an air hose (item #35) that connects there at that fitting, in the housing chamber of the air flow sensor assembly, from the auxiliary air valve ---- refer to this diagram, that fitting is item #13. For some reason your hose is either missing completely or has come unattached. Does your car still have an auxiliary air valve ? If so, is the hose attached to it still ? Image Unavailable, Please Login
EDIT ---- Tom's reference is correct for the 2-valve injected cars where the hose runs from that fitting on the sensor and attaches to the cold start air valve. But, on the QVs, there is no cold start air valve, and the hose runs from that fitting on the sensor and attaches directly to the auxiliary air valve --- as in the diagram I posted for the QV. As your car is an early QV (1983), it could have either system, as it was produced during a cross-over period ---- I suggest you compare it to both (Tom's and my diagram) to see which matches the equipment on your particular car. If it is for the cold start air valve, it has likely been d/c on purpose --- lots of folks do that. And the valve has likely been removed as well. If it is for the auxiliary air valve, it is important and needs to be connected for proper idle performance, so you should get a hose and hook it up (or just reattach the hose if it is flopping around somewhere).
In my case the hose #41 (according to the diagram from "ferrarioldman", or #35 according to "Finnerty") is connected to the air box (or air filter housing, whatever you want to name it). There is a factory opening also in there, more or less like the one of the air flow chamber (tomorrow I will post a picture of that). This opening is not reported in my manual though (!!). Maybe it's a Ferrari's option to plug the hose upper or lower according to the driver mood. Kidding of course..... p.s. my QV is US
That's hooked up wrong then.... On both cars, there should be a separate hose running from the underside of the air filter box to the breather pipe attached to the driver's side of the cam covers (I have that hose circled in red on this diagram). In your scenario, the hose you describe on your car is attached to the same thing in essence ----- air intake to air intake (both pre-sensor meter) --- so that hose does nothing and is not correct at all. Image Unavailable, Please Login
Your explanation seems to make sense, probably my QV belongs to the transition period but it's strange that the factory has left both of the holes, leaving one of them open.... I have removed the cold start valve (and the solenoid attached), plugged the little hole into the plenum and of course the big holes in the hose, where once the valve was sitting in between. But now do you think I have to connect the hose (#35) to the opening in the air filter housing (like it was before) or to the hole of the air sensor housing??
Svito, With the (3) diagrams thus far posted, you should be able to sort out everything on your car correctly. It appears you have both something missing, and something connected wrong ---- and involving 2 separate systems / circuits.
Out of curiosity I checked my now unused FI metering unit. Threre is only a undrilled boss in that location. No hole ever drilled, no fitting. U.S. 85 QV
