The PCV Valve will rattle when new. Why?...Because it's not coated with oil
"gunk". If a PCV Valve doesn't rattle, it's time to change (or clean) it.
In the "Old Days", we used to just clean them every now and then with Carb
Cleaner and they worked just fine.
Running without it plugged in could cause one of two things (if not both):
(1) Excessive Pressure in the engine if it is either sealed up or a breather
cap is installed instead. (Hint: PCV stands for Positive Crankcase
Ventilation)
(2) Removing the PCV Valve and leaving the hole open causes a MAJOR vacuum
leak. That's the reason why the engine revs like it did. The computer will
try to adjust and the idle will come back down though...to a point.
People used to think that it was a better to leave it off and replace it
with a breather cap, but they then noticed that they had to replace their
valve cover gasket(s) much more often. Also, the oil steam that the PCV
removes, stays in the engine causing the oil sludge to build up even more.
Another myth is that people think that the PCV Valve is a smog control
device and therefore should be removed. (See the beginning of the paragraph
for that one.)
It's late, i'm rambling, and that's my $0.02 worth. ;)
Good Night John Boy, Good Night Grandpa, Good Night DML.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
To: dakota-truck@buffnet.net
Subject: DML: Idling findings!
hey, I put a new PCV valve in the dakota, but it is defective, so it keeps
ticking. SO... I pulled the PCV from the crankcase while the engine was
running and then I pulled the PCV from the vacuum tube and DAMN, i betcha
the engine got an additional 500 RPMs. it just reved up. so. I am going to
first change the pvc, then next time I goto the track. I wonder what would
happen if I unhooked it driving down the track,, hehe.
-Dester
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:46:29 EDT