I'm still working on my new (to me) 2011 RDX, and I wanted to add an oil additive while the engine was running. When I removed the oil filler cap there was serious air pressure coming out (I would not be able to pour a liquid in). I had to shutdown the engine to add the chemical.

So, my first thought is that the rings are worn/siezed, but I'm wondering if it could be a blocked PCV valve. Could someone tell me what "NORMAL" crankcase pressure should be with the engine at idle?

Next, could someone tell me where the PCV valve is? Do I have to remove the intercooler to get at it? On GM's you could do a rattle check on a PCV valve (hear the check ball inside is free). Does that work on Acura PCV valves too?

 

I think I found the PCV valve right above the alternator...I wish I could edit my posts but for some reason I can't

 

You only have a short time to edit after a post. Further than that and you need to ask the manager to edit it for you.

 

I believe this is a Honda thing. I have seen this on well maintainted CRV's, our family pilot (2011), and the RDX. I believe my relatives MDX does the same thing and so does a friends older civic.

I changed our RDX PCV valve thinking that it would kill the crank case ventilation, but it made no difference.

My volvo has 0 positive crank case pressure, but that utilizes a much different PCV system. I suspect that the honda system is designs in such a way that this blowby is more normal.

 

Well that's encouraging! I thought this was sever blow-by indicating a worn out engine (or stuck rings). I am planning to pour seafoam into the cylinders and see if that makes a difference.

I can't figure out why the PCV valve isn't passing the pressure. I'm wondering if there could be a blockage before the PCV valve that I need to scrape away....

 

if your car is running fine and not burning oil, I wouldn't worry about it.