My Desmog Thread (6 Viewers)

[FJ40Jim]

The pic below has some problem highlighted.

Yellow is the correct routing of the choke breaker vac hose.

Red is a mystery? The canister purge hose should go to a VCV, then to canister. Where is it going now?

Blue is a heater hose that is kinked. It should be a molded hose from Toyota, not a straight piece of hose bent 150* so it collapses.

 

[rover24]

The pc that's called the gas filter(I think) looks cracked. Is that just the pic?

 

[72rockcruiser]

The pic below has some problem highlighted.

Yellow is the correct routing of the choke breaker vac hose.

Red is a mystery? The canister purge hose should go to a VCV, then to canister. Where is it going now?

Blue is a heater hose that is kinked. It should be a molded hose from Toyota, not a straight piece of hose bent 150* so it collapses.

Will re-route choke breaker and get the right heater hose, need to replace the one by the tstat anyway, its about to burst. I will scope out the one in red when I get home from work tonight.

Thanks Jim!

 

[daflentge]

Ever Seen This Before???

I started my desmog about 2 weeks ago, taking my time. Sent my Carb & Dissy to Jim C. for a sweet rebuild. After tackling a few other little things, like taking the spaghetti tubes of and breaking a nipple on my BVSV#1 , I decided to check out the EVAP sys and test the Charcoal Canister per the Emission FSM... and this is what I found.
View attachment 464716

Look closely at the tube from the Outer Vent Control to the Canister...



Melted or burnt through...



Has anyone a clue how this could/would happen. I never looked closely enough in the past to even see this. I just looked at the hose clamp area and that looked OK. I'm off to get a new piece of tubing, but wondered if anyone had see this before.

I'll update my progress on the desmog after I get some bits back from Jim C.

Thanks to fowldarr for starting this thread and to everyone who has contributed. It has made following in your footsteps nice.

Doug

 

[Beams37]

Not sure about your problem, but you can order a BVSV1 from Cruiser Dan. I had the same issue and it was a perfect new piece ina just a few days. Good luck

 

[daflentge]

Ever Seen This Before??? - Part 2

Thought I'd sharer what I discovered today...

I visited with my good old mechanic friend, (worked on Toys his whole life) and he suggests that this is a melted tube from ether.

In the past, ether was added to fuel in CO, now they use ethanol. If the tank was topped off and the truck sat idle on a hot day, the canister could have sucked in some gas, the ether in the gas will eat right through rubber.

Thus a completely melted (chemically) hose. There is even residue on the top of the canister where it dripped.

Pretty cool he thought - hadn't seen anything like that in awhile.


Cheers - Doug

 

[FJ40Jim]

This is common on Toyotas of this vintage. The hose is molded thinwall because of the tight radius. After 20 years, fuel vapor dissolves the thin hose. New ones are in stock at better toyota specialists.

Please do not bend a piece of generic hose and stuff in there, as it will kink shut, leading to other tank venting issues.

Here's another post w/ hose info.

 

[daflentge]

Canister Saga continues...

I took the charcoal canister out and testing using the FSM instruction... air tries to go in the Tank tube but does not come out...

It goes in the Purge tube and comes out the other two, not the Tank tube. I blew air into the control tube to 'clean' canister. Nothing.

Am I correct in assuming the this is toast? Any suggestions on where to source a replacement???

FJ40 - thanks for the source tip... I thought about looping fuel line. What do you think of that hack?

Cheers - Doug

 

[FJ40Jim]

Doug, isn't the vehicle gonna be desmogged?
Yes. In that case, just swap the hoses on top of the canister: hose from tank, connect to purge fitting. Hose from purge valve, connect to tank fitting.

This will allow the tank to easily breathe out into the canister, preventing the dangerous buildup of vapor pressure that causes tank failure. It's been mentioned elsewhere in thread, but you'd have to slog through 34 pages of chatter to find it.

The shop that has the carb & dissy for your FJ60 also sells the molded canister hose. Contact him to get one added to the order.

 

[daflentge]

Yes - Desmog in process... I'll contact that shop directly and have that hose added to my Carb & Dissy. Thanks

Doug

 

[daflentge]

Oh yeah, here's my update...

I've completed the EGR tube mod, installed a block off plate, switched the canister lines (Tank to Purge), hacked the exhaust tube running up from the Cat with a hose/bolt/clamp rig (this is just until the Cat is replaced w/straight pipe), removed BVSV#2 as well as the air rail bolts & capped with Jim C's plug kit and repaired a broken Carb Isolator plate.

Thanks heaps for everyone's contributions. I'm really looking forward to putting it all back together.

PS: I purchased a bunch of tune-up stuff to do at the same time, specifically a fuel pump. I'm inclined to install the fuel pump, as well as a new PCV valve & grommet and spark plugs before I get my carb and dissy back - Good idea or bad.

I also have 25' of new 1/8 silicon tubing on the way. What other size tubing should I get and how much? I think the tube from the PCV is toast.

More updates with photos soon -

 

[Beams37]

5041K24 METRIC HIGH-TEMP SILICONE RUBBER TUBING, FIRM, 6 MM ID, 9 MM OD, 1.5 MM WALL, RED

5041K22 METRIC HIGH-TEMP SILICONE RUBBER TUBING, FIRM, 3 MM ID, 8 MM OD, 2.5 MM WALL, RED

I'm not sure what all you are replacing, but these are the 2 sizes and the part numbers from mcmaster-carr. There are 2 basic sizes. Good luck. Post up some pictures soon.

 

[daflentge]

Beam - Thanks for the part numbers...

I'm doing a complete desmog (no HAC) - how much of each do you suggest?

I got 25' of the 1/8 ID at MC-Carr on a suggestion from a previous thread, which should work for the 3mm ID. How much 6mm ID should I get?


Current State of affairs...

PS: Does anyone know how to manage Pics. Is there a thread on that. I uploaded four total so far, but it shows I'm at my maximum. Suggestions appreciated.

 

[Beams37]

So I did a full desmog, but included the HAC.

I used 20' of the smaller ID tubing. I literally used every inch. I think 25' would give you plenty of extra. I only needed 10' of the larger ID tubing though. 10" should be plenty. If you look at the pics I posted, the blue tubing is the bigger ID.

Good luck !!

 

[kelly148]

Painless wiring

So I have desmogged this 79 FJ40 I'm working on and it runs well. Now the guy I'm doing this for dropped off the Painless wiring harness he wants installed. The harness does not have anything for the ECU. So how would you wire that in or can it be eliminated?

 

[Kief]

exhaust gasket?

Beam - Thanks for the part numbers...

I'm doing a complete desmog (no HAC) - how much of each do you suggest?

I got 25' of the 1/8 ID at MC-Carr on a suggestion from a previous thread, which should work for the 3mm ID. How much 6mm ID should I get?

View attachment 465373
Current State of affairs...

PS: Does anyone know how to manage Pics. Is there a thread on that. I uploaded four total so far, but it shows I'm at my maximum. Suggestions appreciated.

Is your intake/exhaust gasket shot? It looks pretty bad- if you do replace check for warp on the assembly.

 

[Kief]

EVAP?

Just curious if the Evap VCV "S" port (which I believe is the port which activates the valve from Y to Z vs. X to Z when vacuum is applied) is supposed to only be on the advancer port on the opening side of the BVSV when warm and thus would only vent the EVAP when warm and the advancer port is open when also calling for advance to the distributor-- I currently just have the S port directly to manifold vacuum. I discovered a vacuum leak which was going to the EVAP which appeared to just be sucking air through the charcoal canister--

I will research the options described above...

 

[FJ40Jim]

On the desmog schematic diagram, the canister purge VCV receives ported EGR vac through a BVSV.

It should not be connected direct to manifold vac.

 

[casedog]

I would like to do this as soon as it stops raining here.

 

[Kief]

egr port and Choke brake

On the desmog schematic diagram, the canister purge VCV receives ported EGR vac through a BVSV.

It should not be connected direct to manifold vac.

I hooked a vacuum gauge to the egr port and it just blips a little after throttling up and coming back down- when is it supposed to open? I suppose it only need an occasion purging vs. a constant draw..

Thanks for posting the diagram, I think I have that one printed off.

AS for the choke brake the valve which is green clear and black will only let vacuum go one way and it has no vent like the blue(brown) and black one on the distributor- It won't work as the manual describes testing or applying vacuum to the diaphagm with the (VCV/VTV?)

Oh, and thanks to Jim I realized my venturi's were swapped and had no "O" ring on them- thanks to the PO's mechanic.