Having replaced the perished vacuum hose, not relising their was a restictor inbuilt,(Yes I know now so 100% in backward vision) I now have a rough tickover which appears to be down to this missing bit.
Having been infomed by VOC members I attempted to source the restrictor at 2 Volvo garages with no luck who both stated that the part, even the alternative is now classified as obsolete and no longer available from Volvo in the UK at least
.
So I understand what I need but where to get one or fabricate something.
Anybody any ideas or do I rummage through scrapyards?
I posted up on VOC, but a quick summary or what I said for those who don't frequent!
I've got a stuffed 1.4 on my parents drive, which I know has had the separate restriction added. If you want, I'll get them to go out and get it for you.
What I was thinking, and just need to do a quick check on VADIS, is that the 1.7 also has a carb base to head breather, plugged in to the main breather after the oil separtor. Looking back at it now from when I fitted Fake's Econ gauge, they are damn similar, but I'd have to do a part number check. I don't think the 1.7 ever had them in built into the hose.
They really are a simple part touch wood, so anyone who can't get one shouldn't have trouble making on, could knock them out very quickly on a lathe, but then again, how many people have a lathe in the garage!!!
Haha, well wouter's method would work, but the vacuum of the PCV system wouldn't be present anymore....Better to find a restrictor off somewhere. Surely there are some scrap 1.4 340s around that someone knows of where you can get the hose from.
Failing that Chris might be able to get hold of one for you.
Yeah, if you want the one off my car, then drop me a pm (button is below each of my postings). If you do try and have a noise around on scrap cars, thats fine!
You can make a restrictor from a piece of plastic tubing that has a 0.1 inch hole and is a push fit in the rubber hose. You can block the rubber hose completely temporarily but you will have a rich idle mixture maybe sooting up the plugs eventually. best luck , Steve
Ahh, grand! Just put a post up on the VOC about this... problems communicating to parents which bit it was you wanted Glad you got one, I'll tell them to stop poking!
sorry to join the party late but which way round did you fit the restrictor? it has a larger end and the other a pin hole. the greenbooks I have dont mention it, so it must be in a service bulletin I dont have.
I do have car in a garage with the restrictor fitted by my 340 teacher in 1999 - so I could go check it at some point
lack of restrictor will cause a dodgy idle due to crankcase ventilation not working. I recently worked on a 340 with the crankcase breather on the rocker cover left open to the air - result - very oily rocker cover, engine, carb, manifolds - everything! the connection to the base of the carb was plugged with a bolt - "quality" repair!! ha ha
Ive got some of the restrictors here new from volvo from Nov 2006. I got them as spares. They arent too complex so maybe we can blag someone to lathe some? need to know the sort of plastic used or at least use something with a high melting point! The new S40/V50/C30 use a plastic inlet manifold so plastic isnt a no no for engines....
glad the car is running better
another tip for poor idle is to check fuse number 10. This controls the idle solenoid - if it doesnt work the car will start fine on choke but will stall everytime you slow down and car tries to idle as since the idle solenoid isnt activated, there is no idle jet so no idle!
The way the restrictor is put in doesn't matter Shimon, all it is doing is placing a pinhole into the tube, and the pihole itself is the same no matter which side it is viewed from.
Do you have a set of verniers? They would be very easy to lathe if we had the dimensions, and just do them out of brass or something, as thats dead easy to machine.
I dont have vernier to hand but will try to get some. looking at it, it does look like quite an easy lathe job.
re the restrictor, would the way rond matter since it connects onto the vacuum on the base of the carb so surely a small hole with vacuum applied leading to a larger hole creates a different result to vacuum applied to a large hole which leads to a smaller pin hole?
pressure difference is the same mind so I see your point....
really no affect?
prob sounding dumb here but physic A level was a while ago
Yeah, would be a dead easy lathe job, doesn't need to be that accurate, just a lot easier to measure cylinders with calipers!
Re the bolt fix, Fake and another few in the scrappies I've seen have had that... intriguing.
And the only difference would be a bit of turbulence in the pipes themselves, but that would have such little effect it doesn't matter. It's just to keep some vacuum pressure on the manifold, without it the manifold is kept at atmospheric, so never draws much air through the carb.
Charles
Glad you got one, I'll tell them to stop poking!
on second thoughts I think I will leave that one well alone !!!! 
