Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Alloytec PCV Problem/Fix

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
I did the PCV mod.
Had a spare valve cover. Gave it a go.

Amazing difference.

Pulled the spare off with a claw hammer. Plucked it out easy. But you can’t do this when it’s in the car.

In the car, use visegrips. Put a thick cloth over. Lock the grips, twist back and forth and pull.
They are in with dob of Red thread lock.

To get the PCV hose off, there’s a tab to use. Press in? Out? Can’t recall.

I checked out the Camaro forum. They say 5/64ths and 7/64ths are the drill sizes to use.

I converted that to 3mm for the top hole and 2mm for the bottom.

Soaked the valve for a few days (forgot about it) Throttlebody cleaner evaporated. Left this muck
0C825B00-2BCD-4BC4-A1FF-A27216DC410B.jpeg


It (the wrecker spare) was clogged solid. Couldn’t see through. Heaps more came out after this. Did many many soaks and cleans.

Got it super clean.

Drilled the holes. After this, getting the straw on the throttle body cleaner inside the valve was easy. More schmutz came out. Bits of carbon. Easy to get the metal out after drilling.
Another soak and in it went into the VZ.

The one that came out was ok. Not clogged. Could see through it.

Didn’t expect anything to happen.
However each day, the idle and revs smoothed more and more.
Always has trimmed revs as you drive. The tacho gauge just twitches up and down. Bugged me. Not anymore. It’s pretty much steady as now.

Vacuum seems better. Why??

Smooth acceleration. Smoother than Barry White walking in yogurt.

Would recommend to everyone.

There were no changes made or fuel added during this change.
I take it the ECM has been slowly relearning fuel trims now the crank case gassed are flowing better.

I didn’t get any data before hand.

Will be doing this on my VE Calais now that the VZ is super happy with it.

Again, it was a pleasant surprise.

This came from my VZ one (much cleaner)
085FB644-0291-4D1C-958E-91816C284721.jpeg


Fuel consumption improved as well.
 

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
I’ll take before and after photos of the holes on the PCV on the next one.

GM apparently corrected the undersized PCV holes sometime after 2013?

Can you buy a PCV with factory enlarged holes?
Yes. It costs a Shinto load because it comes with a free valve cover.

Thanks GM ya f%^#ers.
 

scaredyet

Active Member
Joined
Sep 17, 2016
Messages
243
Reaction score
74
Points
28
Age
40
Location
Mosman
Members Ride
Holden VZ Lumina Wagon
I'm interested in this one
 

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
3E2F0F25-BEFD-4FEC-B027-E9C9E4D40D9B.jpeg
So I did the second one that goes on my VE Calais.

This PCV came from my VZ. (I used a spare on that)

Of note is that the two holes are actually slightly different sizes. A smidge under 1.5mm.

You can see the bits of red thread lock.
(Remove: Visegrips, rag over the PCV, twist back and forth, then pull.)

D221253E-4A1A-4105-BEB0-6758EA4C3CB5.jpeg

You can see the mark left on that ridge from the vise grips, so hence why I suggest a bit of rag over it.

7BD1794B-7BD1-4447-8CAD-87A538003594.jpeg


B5DAA606-E462-48EB-938D-A6BEFDCCD33D.jpeg


You can see the holes are small.

Drill 2mm for the bottom and 3mm for the top.

8CA9ABE7-C391-4E25-B834-1AD74BEEA9DB.jpeg


47210EA4-FC44-4AB0-89B3-8EF8EBA885DA.jpeg

I did drill 1.5mm for one hole and 2mm for the other, but considering it isn’t written anywhere that the two holes are different sizes (or why) I said “meh” and did the other at 2mm as well, like I did on the first one that went on the VZ.

D20D57BE-5457-4F41-B2C0-9CF59E2EE407.jpeg

Top at 3mm.

I used a magnet to clean up swarth and then a good squirt of throttle body cleaner through it. The straw fits down the holes now.

2EACD1F0-661B-4E7D-AC30-9470BB5D7138.jpeg

To reinstall, I used a 12mm deep set socket.
E2728D28-E911-4270-96DD-2D8F76979876.jpeg

Tap it in gently with a small hammer. A short socket extension helps make it easier to tap in.

*It should remain harder (more resistance) to blow through from the top than it is to blow through from the bottom. (Had to be careful how I wrote that)
 

Dayvo

Because i can
Joined
Apr 28, 2005
Messages
2,517
Reaction score
3,306
Points
113
Age
64
Location
South East,Victoria
Members Ride
VE SV6 Series 2
Is the pcv valve on the lfx motor on the rear right hand side valve cover ?
 

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
9F286439-C028-414A-A9AE-B2CFE47D2FAF.jpeg


F8484010-B0BE-4314-903E-8399AC5BCCD6.jpeg

This is what I pulled out of the VE.
Gunked up as!
I used the one I pictured earlier.
Came out easy as too. Could have used pliers.

So used a cleaned and modified spare in the VZ.
Pulled the VZ one, cleaned it and modified it. Used it in the VE Calais.
Can't say I have ever done many things on a car as simple and easy to do as this, that has made such a difference to way the car drives.

What a difference to drive! Instant change. Wow. Much smoother. Will get better as fuel trims improve in the next week or so.
 
Last edited:

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
Is the pcv valve on the lfx motor on the rear right hand side valve cover ?
From what I can tell, yes. Same place.
 

99notout

Active Member
Joined
Aug 10, 2013
Messages
579
Reaction score
126
Points
43
Location
Adelaide
Members Ride
VZ Equip Wagon
Great write up, really clear and sharp pictures, thanks! Can you let us know if you end up with more oil in the intake? Interested to know. Cheers.
 

Fu Manchu

Well-Known Member
Joined
Mar 18, 2006
Messages
6,980
Reaction score
4,218
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
To clear up something, the valve cover does not need to come off.
 

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
16,892
Reaction score
5,733
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
Have moved this to the How-to section.

Every person with an Alloytec needs to do this mod.
 
Top