My Desmog Thread

[FJ40Jim]

Yes, it will work fine, as long as the stock curve is still functional..

 

[TacDoc]

Tag for desmog reference. Thanks!

 

[lovetoski]

Carb Fan required after desmog?

I've read this whole thread, printed the appropriate parts, ordered the bits I need, and will soon embark on a desmog to my 60.

Question on the carb fan though... the consensus appears to be that it's function is to reduce heat stress on the intake/exhaust manifolds after shut-down on a hot day. Also that it reduces the chances of vapor lock on a hot day. Makes sense I guess.

However, carbed 60's/62's in AU don't have carb fans. I've never been there...but I hear it's pretty hot. If "desmogged" 60's in AU don't have carb fans, then do NA 60's need them?

Thanks in advance for any input/comments!

 

[FJ40Jim]

No Cruiser needs a carb fan. Or a PCV. or vacuum advance. Or an electric starter.

All are fluffy modern conveniences to make driving easier/smoother/better.

If the carb fan is doing no harm, then leave it alone.

 

[Kief]

No Cruiser needs a carb fan. Or a PCV. or vacuum advance. Or an electric starter.

All are fluffy modern conveniences to make driving easier/smoother/better.

If the carb fan is doing no harm, then leave it alone.

I have noticed that my seldom driven fj60 evaporates the gas out of the carb pretty quick- partially due to the new formulation of fuel I suppose. If the carb fan helps it cool down a bit it might curb the evaporation and the subsequent longer cranking on starts... Just a thought

 

[xulcuz]

Is it possible to only remove the air rail, plug the holes, and still have the motor run properly?

 

[FJ40Jim]

Yes, the AIR system dumps air into the exhaust stream, so it has no effect on how the engine runs.

 

[maat]

im in OZ but have never stuck my head under an fj60 only my hj.. do aussie fjs even have this smog s***?

 

[STUDLY 60]

Will running the distributor vent system without a gas filter cause the commonly discussed cap combustion? evaporated fuel traveling into dissy venting? my was damaged/hollowed and would light matches on start up. I checked hose routing several times and removed it all together and capped it for now for the sake of not destroying a cap or worse? Any help would be great so I can return my vent system to service.

 

[FJ40Jim]

Which/what gas filter?

 

[STUDLY 60]

The three prong vacuum source threaded into the intake manifold, near cyl #2 or #3. Mine was broken and there was a steel screen of some sort within. Possibly It has a different name or acronym? In one of the scematics posted seveal times it labled a gas filter? I used another source for that connection and had my problem with dizzy ventilation. Possible my VCV bad? I compared operation with another I had and both seemed to function the same. They could both be failed/ ruptured. My thoughts were if the gas filter media seperated fuel/ fumes from the VCV then operation without it could be my problem. Thanks for any input.

 

[FJ40Jim]

It's just a manifold vacuum fitting. It's called a gas filter because it has a filter inside (that you saw) to prevent sucking in dirt if the vac hose(s) aren't attached.

 

[STUDLY 60]

Ok then it looks like the VCV is the culprit then. Thanks Jim

 

[woytovich]

Looking for that document that someone here made documenting the desmog process... along with a bit of help from Jim C...

Mark

 

[woytovich]

Is this the right 3mm tubing at McMaster?

5041K521
McMaster-Carr

The catalog page says: "Not rated for vacuum"

Is there a "hard" part number I should be looking at?

Mark

 

[bridges]

I used these a couple months ago - from page 15 of this thread. If I recall, they may be updated slightly or maybe different end numbers for different colors. No issues so far!

3mm - 5041K-22
6mm - 5041K-24

My truck went from not idling to idling without the choke and mileage went from 9.4 to 13.6.

EDIT: also, to answer your previous question - de-smog document threadl (post 59 has the current version)

 

[Blue60]

VTV in dizzy advance line...

During a desmog, this is removed...what was the original purpose, and why is now removeable with a desmog.?

Thanks!

 

[Blue60]

Primary versus secondary dizzy advance

At sea level, with a "HAC less" desmog, it seems that some run the secondary versus the primary dizzy advance port to the carb advancer port.

What is the determining criteria...pinging?

Thanks!

Almost finished my desmog (HAC less) and ready to fire it up tomorrow!!

 

[FJ40Jim]

During a desmog, this is removed...what was the original purpose, and why is now removeable with a desmog.?

Thanks!

The VTV slows the application of vacuum advance, preventing a sudden rise in cyclinder pressure (power) which can cause NOx emissions.

 

[FJ40Jim]

At sea level, with a "HAC less" desmog, it seems that some run the secondary versus the primary dizzy advance port to the carb advancer port.

What is the determining criteria...pinging?

Yes.

Some trucks have more compression, or a leaky vac advancer or a worn governor pin in the dissy, or better fuel (local regs)... So, it's up to the technician to test drive & determine what the best setup is.