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Originally Posted by GM Line Rat
When was the last time you changed your PCV Valve in this car? At approx $5.00 for a new valve, they are a cheap maintainence item, and directly related to venting the crankcase back into the airfilter housing .
If he's owned the car for the last 12 years, I Doubt that it's the 1st time that he's decided to change the air filter in it, Only this time he found the oil buildup. The PCV Valve is what vents the vapors from the crankcase Via the Valve cover etc...
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Oil buid up is common in there and I'm sure that's what he's referring to. He never said he owned it for 12 years, I was referring to the age of the car. All 3 of my metro's show signs of oil in the breather and 2 have new PCV valves....
It may be a good idea to try the PCV valve for the hell of it but I doubt there is any issue here. A small amount of oil buildup is common in the breather as I said earlier. Your PCV valve is located in the center of your intake manifold between the throttle body and valve cover. It is held on by two screws. You will have to remove or loosen the bottom half of the breather from the valve cover with a 10mm socket wrench (1 bolt) to remove the 3 end hose that connects the breather, pcv, and valve cover. Good luck...
PS: It's not necessary to replace the PCV every 5000 miles as stated above. You will most likely never need another one during the remainder of the cars life. If you suspect it's clogged etc you can clean it out with carb cleaner.