Been a while since i went down the desmog rabbit hole....but it looks like you're trying to keep too much smog equipment with a 'desmog' carb
Learning to mechanic: An FJ60 journey (1 Viewer)
- Thread starter AlYamoni
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- #22
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- #23
Desmog carb?
you are posting pics of a carb on the engine and a carb in a box. which one are you asking about?
aftermarket / 'chinese' carbs do not usually have a fuel return line and don't have all the vacuum ports. a factory FJ60/40 aisin carb has a fuel return line and many vacuum ports.
a 'desmog' is when you remove all of the factory smog equipment and all of the assioated vacuum lines.....and either use an aftermarket carb or rebuild the factory carb to not require all of the vacuum inputs. this can be done if you live in a non-smog compliant area. tons of writeups here on this site about it. one of hte most talked about topics.
either go full desmog or full smog-compliant. you'll be chasing gremlins forever if you try and half way do it.
Do you still have the air injection rail and smog pump?
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- #25
Ah, I guess you missed the posts where I learned of the OEM carb and ordered yet another carburetor to add to my collection. Haha
I'm not desmogging anything that I know of yet. Just trying to get this thing running smoothly so I can take a ride.
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- #26
I'm not well enough acquainted with her to know that yet, sir. I'll also confess that I'm not educated on what those things are either.
got ya. Yea, I missed that.
and yes, if you are still 'stock', then you have the air rail and smog pump. I'd google those terms '2f air rail and smog pump' and compare the pics to your engine bay, to get to know the layout of the engine bay as a baseline.
learning about it all is the fun part!
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- #28
Okay so I do have both of those things.
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- #29
Yep! air injection rail is shown
if you are wanting to stay 100% stock and keep all smog components in place, then you'll need to make sure all vacuum lines are connected to the correct spots and are not leaking, all vacuum switching valves are working, and the smog pump is pumping air. Its also recomeneded to have a factory Aisin carb with a full smogged engine.
Lots of nice and clear schematics and write ups here on this site to guide you.
if you are wanting to stay 100% stock and keep all smog components in place, then you'll need to make sure all vacuum lines are connected to the correct spots and are not leaking, all vacuum switching valves are working, and the smog pump is pumping air. Its also recomeneded to have a factory Aisin carb with a full smogged engine.
Lots of nice and clear schematics and write ups here on this site to guide you.
sark
42601-60262-03
You'll find that the emissions manual will guide you through all these, but here's some quick ID's:
Red: Air rail
Green: Smog/Air pump
Blue: VSV (Vacuum Switching Valve)
Orange: EGR Cooler
Purple: EGR Vacuum Modulator
Pink: EGR Valve
Here's the overview from the emissions manual:
Red: Air rail
Green: Smog/Air pump
Blue: VSV (Vacuum Switching Valve)
Orange: EGR Cooler
Purple: EGR Vacuum Modulator
Pink: EGR Valve
Here's the overview from the emissions manual:
Looks like the fuel line for the carb. The top of the manifolds can get pretty warm. I'm sure you'd be okay to replace the line/insulation
These threads are extremely helpful when delving into the emissions and the vacuum systems.
Chasing a vacuum leak
On a side note, after adjusting valves and tweaking carb, I'm now pulling a steady 21" at idle.
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- #34
Man, thank you!
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I'm having trouble figuring out what this third very sad and burnt wire/plug is coming from the same harness that plugs into the carb
The square green plug up top could be for the fuel cut solenoid valve. There should be a ground cable for the carb fan. I don't know about the bottom green round plug. It might be for an emissions related VSV?
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- #37
The square green plug in the top of the pic goes to the carb, so could the bottom green round be the ground?
That wire is most likely the ground for the carb fan which will run after you turn the engine off to deal with heat soak. My ground did not have that green connector.
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- #39
Thank you, that makes sense
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- #40
Is this little hole on the manifold under the carb going to be a big issue?
