No vacuum at PCV hose

[cstamm81]

I just put in a new PCV to hopefully cure a very oily air filter, which I posted about. While I was at it I decided to test the PCV for vacuum, where it had none. So, I traced the hose to where it connects behind the carb, and pulled the hose off the metal line. Still no vacuum there, regardless of RPM. Maybe a tiny little suction, but not enough to even suck up any seafoam. Ok, so what does this point to next? Faulty EGR?

 

[FJ40Jim]

The metal PCV tube is plugged w/ carbon from the functioning EGR valve.

The manifold sideplate must be removed, then the PCV port can br cleaned from the inside w/ a drill bit, and from the outside w/ a piece of wire. Once the carbon starts to break up enough that air and carb cleaner can get through the tube, then it's easy. Keep poking the wire through and chasing w/ carb spray and compressed air.

Once it is reasonably clear & reinstalled, prevent the problem from recurring by disabling the EGR valve.

 

[cstamm81]

I can't find a diagram of the manifold side plate in my online manual. Anyone care to elaborate or have a pic. Sorry for the ignorance. This thing really needs a proper desmog IMO.

 

[FJ60Cam]

It's the piece in the top of the pic. In real life, it's right under the carb & points at the driver's side fender.When I cleaned mine, I had to soak it overnight(s) in a variety of chemicals to loosen the crud up enough to poke a wire through.

 

[2mbb]

Here's a diagram from the emissions manual. The side plate is bolted into the intake manifold below the carburetor on the left hand side (drivers side) of the engine. There are two pipes that come out of it. The one that goes to the front is for the EGR and the one that goes to the rear is for the PCV valve.

 

[NocalFJ60]

I was afraid of that. Sorry to hear. I had to use a screwdriver. It was solid.

https://forum.ih8mud.com/60-series-wagons/33072-pcv-line-clogged-how-clean.html

 

[cstamm81]

thanks gents, now I clearly see what I am up against. I can only imagine how rusty the studs and bolts will be having spent it's life in the Northeast. Should have a fun day ahead of me. And this is telling me at least the EGR valve, and who knows wat else in the smog sytem is not working correctly right?

 

[Butt Ugly Chuck]

And this is telling me at least the EGR valve, and who knows wat else in the smog sytem is not working correctly right?

The metal PCV tube is plugged w/ carbon from the functioning EGR valve.... Once it is reasonably clear & reinstalled, prevent the problem from recurring by disabling the EGR valve.

If you need an EGR to disable, I'll trade you mine for your functional one!

Butt

 

[FJ40Jim]

If you need an EGR to disable, I'll trade you mine for your functional one!

Butt, I prolly got a used one in the desmog pile.
Email me if interested.

 

[cstamm81]

so that is definitely the problem, I just removed the manifold sideplate and holy crap is that PCV port plugged up. I drilled out the manifold side, and tried to run wire through the PCV side. No luck yet, but I have it soaking in Gum Cutter (brake cleaner on roids). I sure hope I can break through this crap.

I think I will disable my EGR after this conundrum, as JimC recommended. The best diagram I could find is this:

It is my understanding that I should disconnect and plug at the three places shown in red, and also at the VTV (top left corner), in order to help eliminate pinging. Is this correct? Just want to make sure before I go a' rippin.

 

[FJ40Jim]

Pull the hose off that goes from EGRVM to EGRV. Cap the fitting on the EGRVM.

See the two hoses on the dissy advance?
Just reverse them to reduce/eliminate the spark knock.

 

[cstamm81]

do i then cap the egrv too?

 

[cstamm81]

i can't for the life of me get more than a pin hole to get through the bend. I tried soaing it in all kinds of crap, wire, picks, compressed air, everything. I'm thinking I might have to cut the tube and drill it out, then reweld the tube back on. What a pita.

 

[NocalFJ60]

I used a propane torch and screw driver. It was a pain.