Missing PCV and hose...
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Junior User
Joined: Sep 2009
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From: Rochester, MN
Missing PCV and hose...
Hi all,
Well, the PO said the PCV was missing from the truck since he got it (and
he had it for ~5 yrs). Looking it over, the hole in the valve cover where
it should go seems to have some crud down in it. I was thinking of just
finding the PCV and hose and just plug it in, but now I think maybe I should take off the valve cover to clean it up good, and then replace the
gasket, etc. Kind of hate to do all this, particularly since I just changed
the oil and it seemed ok (i.e. no dirt or gunk in it).
What do ya'll think? Btw, it is a 1989 300 I6.
Thanks,
Jim
Well, the PO said the PCV was missing from the truck since he got it (and
he had it for ~5 yrs). Looking it over, the hole in the valve cover where
it should go seems to have some crud down in it. I was thinking of just
finding the PCV and hose and just plug it in, but now I think maybe I should take off the valve cover to clean it up good, and then replace the
gasket, etc. Kind of hate to do all this, particularly since I just changed
the oil and it seemed ok (i.e. no dirt or gunk in it).
What do ya'll think? Btw, it is a 1989 300 I6.
Thanks,
Jim
Thread Starter
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Junior User
Joined: Sep 2009
Posts: 71
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From: Rochester, MN
well I went out to try and dig the "crud" out of the hole, and it is very
hard. not sure if it is baked "crud" or if there is a circuit board of some
kind that goes with the pcv valve? any help would be appreciated.
Jim
hard. not sure if it is baked "crud" or if there is a circuit board of some
kind that goes with the pcv valve? any help would be appreciated.
Jim
Senior User
Joined: Jun 2009
Posts: 480
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From: Hudson,Michigan
I don't know of any circuit board that would be there.Are you sure it isn't the broken plastic end of the original pcv ?If so,you may knock it inside the valve cover.If there is a rubber grommet in the hole,maybe you could pry out the grommet?I'm thinking this is an EFI,and if so,changing the valve cover gets a little harder.Running that long with no pcv is rough too,was the vacuum hose connection plugged off?Getting it back to the proper pvc set up would for sure be a good thing to do.
Thread Starter
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Junior User
Joined: Sep 2009
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From: Rochester, MN
I don't know of any circuit board that would be there.Are you sure it isn't the broken plastic end of the original pcv ?If so,you may knock it inside the valve cover.If there is a rubber grommet in the hole,maybe you could pry out the grommet?I'm thinking this is an EFI,and if so,changing the valve cover gets a little harder.Running that long with no pcv is rough too,was the vacuum hose connection plugged off?Getting it back to the proper pvc set up would for sure be a good thing to do.
there but why would I pry it off? won't I need it when I finally get the
pcv valve back in?
jim
ps
and yes, it is an EFI. And I noticed there is a lot of stuff I would have
to take off to change the vc gasket!
Thread Starter
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Junior User
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From: Rochester, MN
jim
Senior User
Joined: Jun 2009
Posts: 480
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From: Hudson,Michigan
The reason I said maybe pry it off is that if the broken piece was in it,you could remove it,take the piece out and put the grommet back in,without losing it in the valve cover.I wasn't sure about a baffle being there.If that hose was just running open,I'll bet she runs better after you get it back in shape,had to be gulping a lot of air.Make sure it is gulping air,just in case that hose fitting got plugged while it's been run exposed to God knows what.Make sure the support bolt for the plennum (located right under the throttle body) is still there,it connects the brace coming up from the head to support that massive intake.Mine was missing and it cost me an intake gasket job because of the intake viberating and working the gasket until it leaked bad.
Last edited by 300 Buster; Oct 15, 2009 at 10:06 AM. Reason: added info
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Junior User
Joined: Sep 2009
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From: Rochester, MN
The reason I said maybe pry it off is that if the broken piece was in it,you could remove it,take the piece out and put the grommet back in,without losing it in the valve cover.I wasn't sure about a baffle being there.If that hose was just running open,I'll bet she runs better after you get it back in shape,had to be gulping a lot of air.Make sure it is gulping air,just in case that hose fitting got plugged while it's been run exposed to God knows what.Make sure the support bolt for the plennum (located right under the throttle body) is still there,it connects the brace coming up from the head to support that massive intake.Mine was missing and it cost me an intake gasket job because of the intake viberating and working the gasket until it leaked bad.
throttle body until I saw big this thing was ;-) I'm amazed at how intact
this engine is except for the pcv and hose. I will try and find those from
a junk yard somewhere, and buy a new pcv valve. As you said, it should
run much better then. I will check the bolt, but I bet its there and secure.
Jim
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Thread Starter
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Junior User
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From: Rochester, MN
Update on Missing PCV Hose
Hey guys,
well could someone tell me Where the PCV valve is on a 1989 300 I6?
I went to a massive salvage yard today (30+ acres and over 2,000
vehicles!) and I found what was missing from my truck. It was a hose
that runs from the air filter box and plugs into the valve cover, just a
few inches behind the oil filler cap. I know it has something to do with
emissions, but not sure if that was the pcv valve? The part that plugged
into the hole was a plastic doohickey with a mushroom type bonnet, and
looked like maybe it could possibly hold a pcv valve? I would post a pic
if I could find my camera ;-(
Thanks on helping to resolve this matter!
Jim
ps
I have a manual but it doesn't show a picture of what I'm looking at?
well could someone tell me Where the PCV valve is on a 1989 300 I6?
I went to a massive salvage yard today (30+ acres and over 2,000
vehicles!) and I found what was missing from my truck. It was a hose
that runs from the air filter box and plugs into the valve cover, just a
few inches behind the oil filler cap. I know it has something to do with
emissions, but not sure if that was the pcv valve? The part that plugged
into the hole was a plastic doohickey with a mushroom type bonnet, and
looked like maybe it could possibly hold a pcv valve? I would post a pic
if I could find my camera ;-(
Thanks on helping to resolve this matter!
Jim
ps
I have a manual but it doesn't show a picture of what I'm looking at?
Senior User
Joined: Jun 2009
Posts: 480
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From: Hudson,Michigan
Look around under your plennum and see if there is a place for your pcv,if I remember right,when I had my intake off my efi ,the pcv was under the plennum,we replaced it because I new it would be bad to get to later and I think the line to it goes to your intake or plennum.I think the one to your air box is just a breather or vent.The whole idea behind the pcv is to reburn crankcase fumes and it's called"positive crankcase ventilation" because there is vacuum there to cause the cc to operate under negative pressure.Are you for sure that it is missing?If the hose or fitting was not plugged,it would cause a real bad vacuum leak.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
On the EFI 300-6, there are three fittings in the valve cover- The first is the tall oil fill. The second is the fresh air intake, usually there is a hose that goes to the air filter box or inlet tube before the throttle body. The third is the PCV port.
Senior User
Joined: Jun 2009
Posts: 480
Likes: 0
From: Hudson,Michigan
Yes,That is what I meant by"under the plennum",I should have added in the valve cover.I think,what has been missing all that time is just the vent ,otherwise it would have more problems than it has.
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