PVC and Oil?

JohnnyG · 03-18-2002, 02:22 PM

I just changed out my pcv valve and found a significant amount of oil all over the valve and rubber grommet. The area around the pcv valve location was thickly caked with old oil and grime- these are all things I don't remember associated with my last pcv valve change 20,000 miles ago. Is this normal??

Also, I keep losing a quart of oil every couple thousand miles or so... could this be where it is all going? Could this possibly just be a clogged screen?

Ideas?

John

Chevyguy · 03-18-2002, 03:19 PM

Did you use a Motorcraft PCV? The parts store ones don't fit tightly enough. Otherwise maybe time to change the screen underneath. I just changed mine it was nasty! A plugged up screen can cause excess pressure inside the motor and cause gaskets to fail!

A quart every thousand or two is pretty good, my brand new 91 would only get about 1500 on a quart and did not leak a drop!

Mr 5 0 · 03-18-2002, 03:21 PM

Originally posted by JohnnyG

I just changed out my pcv valve and found a significant amount of oil all over the valve and rubber grommet. The area around the pcv valve location was thickly caked with old oil and grime- these are all things I don't remember associated with my last pcv valve change 20,000 miles ago. Is this normal?

No. You may have developed blow-by or possibly the PCV valve was not tight. You may also have a upper intake leak but not too likely if it wasn't disturbed.

Also, I keep losing a quart of oil every couple thousand miles or so... could this be where it is all going? Could this possibly just be a clogged screen?

It certainly could be a source of the oil loss but the PCV screen would have to be very clogged. Install a new PCV, screen and grommet and check it every few thousand to see if it's clogging/leaking as you also keep tabs on your oil consumption.

03-18-2002, 02:22 PM	#1
JohnnyG Registered Member Join Date: Feb 1999 Location: Baltimore, MD USA Posts: 105	PVC and Oil? I just changed out my pcv valve and found a significant amount of oil all over the valve and rubber grommet. The area around the pcv valve location was thickly caked with old oil and grime- these are all things I don't remember associated with my last pcv valve change 20,000 miles ago. Is this normal?? Also, I keep losing a quart of oil every couple thousand miles or so... could this be where it is all going? Could this possibly just be a clogged screen? Ideas? John __________________ 1991 GT Vert- Black/Black/Black Exhaust, Tremec, Tri-Ax, Centerforce Dual Friction, 3.73's, Rear Seat Delete MM Road & Track Kit PBR 5-Lug Brakes Cobra R's w/ 255 Rubber Rice Hater's Club #60

03-18-2002, 03:19 PM	#2
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	Did you use a Motorcraft PCV? The parts store ones don't fit tightly enough. Otherwise maybe time to change the screen underneath. I just changed mine it was nasty! A plugged up screen can cause excess pressure inside the motor and cause gaskets to fail! A quart every thousand or two is pretty good, my brand new 91 would only get about 1500 on a quart and did not leak a drop! __________________ 2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork.

03-18-2002, 03:21 PM	#3
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	Re: PVC and Oil? Originally posted by JohnnyG I just changed out my pcv valve and found a significant amount of oil all over the valve and rubber grommet. The area around the pcv valve location was thickly caked with old oil and grime- these are all things I don't remember associated with my last pcv valve change 20,000 miles ago. Is this normal? No. You may have developed blow-by or possibly the PCV valve was not tight. You may also have a upper intake leak but not too likely if it wasn't disturbed. Also, I keep losing a quart of oil every couple thousand miles or so... could this be where it is all going? Could this possibly just be a clogged screen? It certainly could be a source of the oil loss but the PCV screen would have to be very clogged. Install a new PCV, screen and grommet and check it every few thousand to see if it's clogging/leaking as you also keep tabs on your oil consumption.