These have a PCV oil trap, not a valve. It is located under the intake manifold. The hoses run from under the spark plug wire cover all the way down to the oil trap and over to the throttle body. Over time the PCV oil trap becomes brittle and clogged. You will need to buy a new PCV kit for around $150 and replace it. Before you do, you must clean out the engine block where it attaches at its lowest point on the engine. I used sea foam, compressed air, and a coat hanger. I did an oil change at the same time so I could drain the sea foam out of the oil pan. Make sure you clean it out good because it will spray oil out of the dipstick and oil filler cap even after replacing the PCV components.
SOURCE: 1996 volvo 850 GLT how to replace air valve and pump
VOLVO STARTED USING THIS SYSTEM IN 1996 AND 1997 850 MODELS IT IS AN AIR PUMP --------------SMOG PUMP TO MEET EPA EMISSIONS THE DIAGRAM OF THE SYSTEM IS LOCATED UNDER THE HOOD AND SHOULD TELL YOU WHERE THE VALVE IS LOCATED THERE ARE MANY ECU SYSTEMS USED ON VOLVOS AND THIS SHOULD PUT YOU IN THE RIGHT DIRECTION IF YOU STILL HAVE A PROBLEM GIVE ME THE 2 BIG NUMBERS ON THE ENGINE MANAGEMENT ECU
SOURCE: volvo 850 won't start occasionally
Hey Kolby!
Sounds like you've got an issue with your alarm module, causing the immobilizer to activate (also known as a "start inhibitor"). I'm not sure what type of alarm you've got, but this will probably help you find out if there is something wrong with it:
There is a panel with relays on it behind the dash. At the bottom of the steering column, by the drivers feet, there is a panel. Remove it to get access to the relay panel (just a couple of torx screws, no breakable clips as far as I can remember). Remove the "double size" relay (probably marked 210-211). Put a wire between the terminals 50E and 50F. This will hotwire the immobilizer and make sure that it always activates when turning the key.
Drive around with the wire in place instead of the relay for a while to see if this helps. If it does you'll know that the problem is related to the alarm system. Keep in mind that you will be without alarm and therefore probably also without remote central locking while doing this.
Make sure that the wire is connected firmly enough so it doesn't come loose. You can also put a fuse on it if it makes you sleep better at night ;)
Good luck!
SOURCE: how do you change the pcv valve on 94 volvo 850
It has a flame trap, no PCV valve per say. On your air inlet tube come from the throttle housing you'll see it. Disconnect the hose from throttle and air box.
remove and twist flame trap out, replace plactic screen and reinstall.
SOURCE: pcv valve location
volvo s80 y reg 2.4 runs ok little bit lumpy tickoover when warm but very loud whistling noise take dipstick it stops but very big suction from tube not pressure it is not breather box under manifold
Turn the Volvo 850 off and allow the engine and its components to cool for 30 minutes.
Open the hood of the Volvo 850 by pressing the hood release button within the vehicle. Locate the PCV valve; the valve is identified as a small rubber valve located on the engine crankcase. You will also notice a small hose sticking out of the end of the valve. If needed, read the Volvo 850 owner's manual for more information.
Disconnect the hose from the valve by pulling the hose out of the valve. The hose will come off the valve with minimal force.
Turn on the engine of the Volvo 850. Place your finger over the hole in the valve where the hose was connected. If you feel a strong suction, the valve is working properly and fine. If you do not feel a strong suction, the valve may be clogged and needs replacing.
Turn off the engine of the Volvo 850. Use needle-nose pliers and grip the valve. Pull the valve off of the crankcase.
Install a new valve by putting the valve in place on the crankcase. Insert the hose into the new PCV valve. Secure the new valve in place by pushing it down until it locks into place. Close the hood of the Volvo; pull up on the hood to ensure the hood is shut properly.
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