I might just pull the ccv orifice from the valve cover, leave it on the line? (and keep it right side up)

 

1991 thru 2001 are different. They have a straight thru fitting with the orifice. No magical internals like you showed. That fitting looks like a PCV valve.

O'reilly has the fitting on the "HELP" shelf. I think I'll buy one, measure the orifice, then take it back for a refund.

 

Negative on that. The grommet and fitting get butchered beyond reuse when trying to remove them.

 

Gotchya'. I'm pretty sure you have at least as good, or a better understanding of these systems than myself. My .02 is a 2.6mm would be close enough given all the other variables that are being dealt with. Granted things changed, but the 4.0 is still shooting for about the same mix. Best of luck, and Happy New year!

....grab one at the JY?

 

Happy New Year to you as well bud.

See ya next year.

 

Side note. Here in CC, (crescent city), I had a neighbor, Ken. He had a VERY loud generator, and Psychotic Roosters. 1-2-3 am, "***-a-doodle -doo" was in a memo thay hadent gotten get. "screach- a what'a -woops" was the pre-dawn greeting for years.

He opened a shop here, and is a good guy doing quite well. When I first saw CCKEN....Course I had to wonder!

Yea, that CCV valve is right out of the 90 FSM. Limits flow at high vac. Don.

 

Nice illustration in that '90 FSM.

Found out what the CCV orifice should be...sorta.

The '99 FSM, Section 14, describes a special "Fixed Orifice Tool" used for the Throttle Body Minimum Airflow Check, which is for checking the TB calibrations for correct idle conditions. The FSM says the tool has a fixed internal diameter of 0.185". In use, the CCV hose is disconnected at the intake manifold and a piece of hose is connected to the vacuum nipple on the manifold then the tool is inserted in the hose. The CCV hose from the CCV fitting on the VC is left hanging at the side of the engine. Engine is run at operating temp. If everything is in working order, the engine should idle at between 500 and 900 RPM. It goes on to say that if the engine idles outside these specifications to replace the TB.

So...I think I'll make my getto gadget with a .185" hole in it.

 

I guess .185 is close to 4mm. Wonder if they run that, of if it's just for the tester.

 

I think that FSM test tool is just for test, but I'm stumped about the size of the fixed orifice in that thing...unless the FSM is wrong...But wait, the FSM is never wrong.

Picked a Dorman CCV fitting up from O'reilly today ($5.00) and went to my local hardware store that has millions of drill bits. I fished through their drills and found that a #36 drill fits perfectly in the CCV fitting orifice. Put it back when I finished and thanked them for the use of their drill. LOL

A #36 drill is .1065" in diameter.

I'm going to keep this CCV fitting in my tool box as a spare, and if I need it as a tool, I'll rig up some hoses to tempoarily fit it to the vacuum nipple in the intake manifold.

So there you have it.

 

Ha! Well, well done, (it seems). Well, without finding a conversion chart or equations, just looking at the graduations on a Vernier Caliper it seems .1065 lines up pretty well with 2.6mm!

 

Close my man.

http://www.csgnetwork.com/drillsizeconvert.html

 

So, 4 thousands of an inch....plenty in a few places!

(nice chart!)