The vapor cannistor for recircling of gasses into the intake,does the purge valve supposed to tick like the one on my car does when the engine is running?
Is there a maintance or a way to check (speaking of the cannistor and the valve) it's doing what it's supposed to do?
Lastly, the vacuum hose that goes to the purge valve (that goes to the vapor cannistor) is the largest hose on the vacuum tree, it pulls alot of vacuum I'm thinking. What would happen to the car with this unhooked and plugged up, set off check engine lights and hurt things, or would this give better power and fuel mileage?
Thanks all
Poolman

Hi Poolman,

The purpose of the canister is for fugitive vapor emissions. Rather than being released into the atmosphere they are stored in the carbon canister. (The granulated carbon in the canister temporarily stores the HydroCarbons), to be burned in the engine at the best possible time.

When the engine is under load (low vacuum but high flow), the engine is able to handle the stored up gasoline 'fumes' and the valve is opened (under the correct conditions by the ECM).

The 'fumes' enter the system post MAF so the ECM somehow compensates for the extra A/F, unless it is really a very small amount (dimimus) and not really an issue.

If the ECM does not have to compensate for this (because of the small volume), then plugging the line probably won't hurt. I don't know what would be gained either.

DEWFPO
--
1998 S90 071,245 and 1995 964 154,100

Thanks Dewfpo

I checked the vacuum that is required to the pulse valve for the cannistor, it's so intermentent that there is just a small amount going thru--as you were stating-so I guess that explains the click from the valve itself.
When I owned 240's and my 940 turbo I watched what was going on with fuel mileage and could just about tell when something was going on ,like a vacuum leak ,that would cause the mileage to go down. With the 960 and all the miles on her now I tend to look at mechinacal parts causing problems. Facts are though ,when you start seeing mileage fall off, vacuum leaks are really the first place to look. Lots of good indy shops and Volvo shops as well tend to overlook just these little things--I guess to go after more high dollar parts instead of a vacuum hose.
I'm going to install a vacuum gauge in the car soon, I noticed that Sun has a small pod that can hold a gauge and be installed with a good clean look.
Thanks again
Hope things are going well
Poolman

Musta hit the key twice.
Poolman