Question about 1997 Volvo 850

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Oil trap may be clogged - 1997 Volvo 850

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Ho to replace oiltrap on volvo 850 1997

Posted on Dec 05, 2010

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Posted on Jan 02, 2017

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For the protection a new filter offers for a minimal cost, always replace it!

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Your PCV (Positive Crankcase Ventilation) there is an oil trap and associated hoses on the front of the engine. It runs from under the spark plug wire cover down beneath the starter (the oil trap is located here). Typically, the system plugs up and dries out. You need to remove the trap and hoses and clean the holes out beneath the trap which drain into the oil pan. I used a small brush and a bent coat hanger. I also drained the oil (needed to be changed anyway) and sprayed some sea foam down there to loosen things up and then blew it out with rubber hose with compressed air. It worked well. Pay special attention to cleaning out the bottom hole because this is where it gets clogged the most. The parts cost about $150 or so.

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If the seal is leaking you want to check that the flame trap system it working properly. This is also referred to as the crankcase ventilation system. If this system is clogged it will allow too much pressure to build in the crankcase and blow oil past the seals.

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Clogged oil trap (PCV system, positive crank case ventilation). The hoses and oil trap need to be replaced (due to become brittle, dry rotted, and clogged) as well as cleaning out the sludge in the bottom of the engine block. The parts cost about $150 last I checked, and you will need to remove the intake manifold and spark plug wire cover to access the hoses and oil trap. On the bottom of the trap it connects to the engine block where you have to clean out the oil sludge. If you do not clean out the oil sludge it will still create back pressure through the oil cap and dip stick. I actually did an oil change at the same time, and drained the oil first and left the drain plug out while. I sprayed Sea Foam and compressed air down there to get the sludge out. I also used a coat hanger and brush to scrape/scrub it out. Worked good.

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1 Answer

1996 volvo 850 pcv valve location


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.

Apr 13, 2012 | 1995 Volvo 850

1 Answer

Just recently replaced the flame trap on a 240 GL and noticed nipple to the oil trap seemed to be clogged. Do I have to take off the manifold and remove the oil trap to clear it?


Probably. Next time you change your oil, you can try pouring some solvent such as SeaFoam down the hose and letting it sit overnight to see if it flushes through. Good luck.

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Volvo 960 estate blowing oil from the oil filler cap Whats causing it?


Your PCV / Oil trap is likely clogged. I have had some luck running Mobile 1 Synthetic oil and half a can of seafoam in the engine oil to clean things up but it is likely that you will have to replace the pcv system.

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The engine breather pipe seems to be blocked.
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black smoke ( burning too much gas)
blue smoke (burning oil)
white smoke ( burning coolant)
hope this helps

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