Oil in air intake line coming from line cast into the valve cover
What is your question?
I have a 2007 chevy cobalt, 2.2. I have noticed excessive oil consumption. I have checked the oil pan and filter for leaks. I noticed that I have oil in the air intake line on top of the valve cover. There are no leaks around the valve cover gasket either. There is some oil in the air box. The car does rough idle on occasion but the check engine light is not on. I've done research and found that the vehicle does not have a serviceable PCV valve. It is actually cast into the valve cover. I don't hear any odd noises at the moment. I have kept up with the maintenance ie oil changed and the oil is not over filled. The vehicle has appx 168,000 miles and is in good condition. Would a valve cover replacement along with the gasket be a good start? I don't know much about the pcv valve being built into the valve cover and there is very limited information on this. Thank you.
What makes this problem better or worse?
nothing at this time
How long has your 2007 Chevrolet Cobalt had this problem?
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Hello,
The 2.2 eco has a long history of this issue. The problem is that the PCV valve is bad (change the cover) or there is excessive pressure in the crankcase (blow-by).
Before replacing the valve cover/PCV valve, make sure to check the compression on all cylinders. If you have low compression on one or all, a leakdown test will show you where the low compression is coming from. If air is hissing through the dipstick tube, the engine needs new rings, and that is the issue with the oil in the intake.
Keep in mind, a PCV valve with 168k miles has had a long life, but the valve cover may be costly to find that the PCV valve wasn't the issue. Test before you invest.
Thank you for the information. This is very helpful!
No problem!