News: Putting FUN and FRIENDLINESS, FIRST into owning and learning about AMC small bodied cars, primarily Eagles, Spirits and Concords as well as vehicles built in AMC's Mexican subsidiary, VAM.

The AMC Eaglepedia can now be accessed using the buttons found below  This is a comprehensive ever growing archive of information, tips, diagrams, manuals, etc. for the AMC Eagle and other small bodied AMC cars. 

Also a button is now available for our Face Book Group page.


Welcome to the AMC Eagles Nest.  A new site under "old" management -- so welcome to your new home for everything related to AMC Eagles, Spirits and Concords along with opportunities to interact with other AMC'ers.  This site will soon be evolving to look different than it has and we will be incorporating new features we hope you will find useful, entertaining and expand your AMC horizons.

You can now promote your topics at your favorite social media site by clicking on the appropriate icon (top upper right of the page) while viewing the topic you wish to promote.


  • November 11, 2024, 09:10:18 PM

Login with username, password and session length

Author Topic: PCV valve routing looks wrong?  (Read 3662 times)

0 Members and 1 Guest are viewing this topic.

Offline Brownc62

  • Hatchling
  • *
  • Posts: 3
  • Thumbs Up 1
PCV valve routing looks wrong?
« on: December 09, 2019, 01:54:41 AM »
Hello all, I’m an Eagle newbie and this is my first post. I’ve been gaining tons of knowledge from this website so far. I’m working on reviving an ‘82 wagon with the 258 and the first anomaly I have come across is the vacuum line routing to the PCV valve.

The valve has a “T” split with one line running to the back of the carb which is correct according to the vacuum diagram I found on here. The other end runs to the manifold and plugs into another “T” fitting with the power brakes. According to the diagram, this line should run into the “canister purge” instead.

My question is will this allow the PCV system to still work properly?  Is the system essentially just getting double the manifold vacuum drawn on it with this setup? Or is it canceling out vacuum and causing the system to not work at all? The engine does seem to have some blow by, so I’m curious if this is an indictor that it isn’t working properly.

Just some background info. The car has been sitting for almost 2 decades because the previous owner could not get it to run higher than an idle. I threw a new carb and fuel pump on which didn’t fix the issue. I then disconnected the catalytic converter and that ended up fixing the problem. Revs up great now. It was totally plugged up! Wondering if that has anything to do with a malfunctioning PCV system?

Thanks for any insight!

Online Still Pat

  • Eagle Sport
  • ****
  • Posts: 446
  • Thumbs Up 18
Re: PCV valve routing looks wrong?
« Reply #1 on: December 09, 2019, 10:11:28 AM »
From what I recall, mine was the same on BlackBird. Don't recall looking at this one.
'83 AMC Eagle wagon 258/auto.
'84 AMC Eagle sedan (4 door) 258/auto.
PREVIOUS AMCs:
'72 Gremlin X 304/3 speed
'81 Eagle Kammback 258/4 speed (Purchased new)
'82 Eagle wagon 258/5 speed (Ordered new, traded Kammback)
'86 (I THINK) Eagle wagon - BlackBird 258/auto. (Got hit/totaled)
'83 Eagle wagon - White Eagle 258-auto. (Front subframe was rotted out - sold for parts)

Offline MIPS

  • Eagle Limited
  • *****
  • Posts: 528
  • Thumbs Up 52
Re: PCV valve routing looks wrong?
« Reply #2 on: December 09, 2019, 03:21:17 PM »
Because both vacuum ports are manifold and basically pulling vacuum from the same point in the manifold you should not have an issue with the PCV in this configuration. I'm assuming you've had the charcoal canister deleted?

Vacuum routing on the T for the brake booster should also run to the cruise control, CTO switch, vacuum solenoid manifold for the secondary air and sol-vac systems and one of the vacuum switches.
« Last Edit: December 09, 2019, 03:27:10 PM by MIPS »

Online Taylor

  • Administrator
  • Eagle Sundaancer
  • ******
  • Posts: 905
  • Thumbs Up 36
Re: PCV valve routing looks wrong?
« Reply #3 on: December 11, 2019, 09:07:51 AM »
If you still have the factory bbd carburetor this might help.
2010 Toyota Rav4 pack mule, totaled 3/26/24 rear ended REAL HARD. concussion and whiplash. not fun
1999 Ford E250 conversion/work van 238,000 see if it will make 300,000
1985 AMC Eagle Limited Wagon 🖖🏼🦅
2020 Honda Africa Twin, the long haul trucker

 

SMF spam blocked by CleanTalk