Due for a Volvo PCV Job?

Here's how to do a Volvo PVC job on your vehicle

A Volvo PCV job is a pretty manageable project for the typical do-it-yourselfer. Learn more here about how to do one, how long it might take, parts you need, and when and why you should make sure this is done to keep your Volvo running well.

Tips on doing a Volvo PVC job on your 850, S70 or V70

“I have not removed the injectors on any of them. The only thing that is tricky is getting the fuel return line off since the hose is a little short. I loosen the upper clamp – it is easier to get to the upper clamp than it is to get to the clamp on the fuel pressure regulator – and then just complete yanking the hose off as the intake manifold is coming off.

If you do wind up removing the rail I would have a full set of O-rings and the plastic injector caps on hand.”

Volvo’s Positive Crankcase Ventilation (PVC) is a breather system that regulates the hazardous fumes your vehicle puts off. In modern Volvos, an oil trap does the same thing.

Due for a Volvo PCV job

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Not sure if it is plugged? I made a simple manometer to check using clear hose and water. Just use 1/2 clear tube and push into dipstick tube. (my tube was pretty thin wall so it could distort). First put water in the tube so you can have a U shape of at least a foot or so of water and room to move, hanging down in front of the car. Normally the water level is equal of course on both sides. The pressure in the crankcase will push the water to give you a reading of the difference in height, or inches of water. Mine was only about 1/2″ under load, which is fine I think. If you are going to damage the rear main I would expect to see upwards of 5-10″ H20. I don’t know bad it can get or if there is a spec.

So I was on a roll and also did this for my furnace filter to see how plugged it was getting. It seemed plugged and so I was measuring about 1.5″ H20 which is about all the blower can pull so it was pretty plugged. The new one brought it down to 1/4″ or so. I just put a small hole with a piece of elec tape over it (also with a hole) and press down a brass fitting over it (ground flat).

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