Oct 11, 2002 · I replaced the PCV valve in my wife's car with an aftermarket PCV valve and it gave horrible results. Start-ups and idle was rough, plus it began using oil for the first time. I tried a store brand PCV from both Autozone and Advance Auto Parts.

Oct 9, 2014 · Conditions that can cause a PCV valve to rattle are improper installation (upside down or not vertical), or erratic pressure differential fluctuations between the intake and the crankcase. The former can be checked by simply looking at the arrow on the PCV valve… it should opint toward the engine’s intake.

Apr 3, 2006 · The rattling seems to come from the PCV valve, as when I remove it, the rattling COMPLETELY goes away. I even replaced it with a brand new Motorcraft PCV valve, and the rattle is still there. There is no oil consumption going …

Feb 8, 2015 · After installing my cammed 302 I'd noticed the PCV valve made a loud fluttering rattling noise. It almost sounded like a valve ticking, and you could feel it if you put your hand on the valve cover, but if you pinched the vacuum hose shut it would stop, and the idle would drop.

Nov 19, 2018 · yes, the wrong aftermarket valve can be very noisy. go with the oem one for this application to ensure it's the correctly tuned one for your engine. Sounds like you got it covered and the right advice: in this case stick with OEM. It is …

Jul 9, 2022 · The PCV valve was without a sealed plastic bag, just loose in a box (made in Mexico). When I shake the valve, THERE IS NO RATTLE. Blowing thru one end - air pases thru, but not when you blow air from the opposite end.

May 9, 2023 · The easiest way how to tell if PCV valve is bad is to remove it from the engine and shake it. If you can hear it rattle, all should be fine. If not, it might signal that the valve is clogged with oil and carbon buildup, and it cannot open or close properly.

Jan 7, 2010 · I checked the PCV valve and it wasn't 'rattling' so I cleaned it with Gumout spray. The PCV valve only has approx. 5K on it. What causes this gumming up? I've been using aftermarket (Purolator and Fram) pcv valves but I am thinking of …

Apr 8, 2017 · I replaced the PVC valve, and grommet a few years ago. Today while looking for vacuum leaks to fix a OBD1 code 311, I find that oil is coming out of the grommet again. I then realize that I have not heard it rattling the last few days.

Mar 26, 2023 · If you hear a faint rattle, try spraying the PCV valve with some brake parts cleaner, then shaking the valve back and forth. Repeat this step a few times and see if there’s any improvement. If the rattling sound gets louder, you may be able to reuse the PCV valve.