DIY Solution to M54-M52TU CCV problems

[FastEddie313]

Originally Posted by cn90

Please post EXACTLY what you did (photo is helpful to show individual components).

Back when I did mine, I left out the Duralast PCV valve just to see, I HAD the same exact problem as you did, excessive vacuum causing hissing noise (air sucked into the crankcase via the RMS).
Installed the Duralast PCV Valve, problem solved.

So the Duralast PCV valve reduced the flow from 3/4" to 3/8" and somehow the 3/8" flow restriction does the magic trick, i.e., it is just about the correct amount of vacuum.

BTW, I am 20K since this mod, zero oil consumption. I recommend this mod.

Mine is exactly like the OP but possibly a different brand of valve. It is whatever carquest had for a 1998 k1500 replacement, which the duralast valve in the OP is..
I understand you suspicion of proper work, maybe I will make a youtube video but it's dark out..

It sings like a reed to the RPM..
Does sound like the RMS area or oilpan gasket or somewhere down there..

I sprayed my new connections with PB blaster to check for leaks and it made no difference..

50 miles or so now and still the same..

Mayo under the oilcap is gone already though and dry as a bone!