Columbian 1FZ-F
Shown on the diagram but no part #.
Shown on the diagram but no part #.
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What’s this? (Side of air filter housing.)
- Thread starter thebill
- Start date
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Hello,
I think it is an air filter warning sensor. P/N is 89593-60010.
It should have an upper tip to connect a flexible hose. Yours is broken.
It works together with what Toyota calls a "thermostatic valve."
This valve connects to another valve and an actuator in the bottom of the air filter housing, which in turn controls a flap that allows or blocks exhaust gas inflow. There should be a flexible hose from the air filter housing to the carburetor. Last but not least, there should be a hose connecting the exhaust manifold and the air filter housing.
There should be an ECU for this system above your glove box.
If any of these parts is either missing or broken, it is better to repair it. Otherwise, your fuel mileage will suffer, and engine tuning will be difficult at best.
Juan
I think it is an air filter warning sensor. P/N is 89593-60010.
It should have an upper tip to connect a flexible hose. Yours is broken.
It works together with what Toyota calls a "thermostatic valve."
This valve connects to another valve and an actuator in the bottom of the air filter housing, which in turn controls a flap that allows or blocks exhaust gas inflow. There should be a flexible hose from the air filter housing to the carburetor. Last but not least, there should be a hose connecting the exhaust manifold and the air filter housing.
There should be an ECU for this system above your glove box.
If any of these parts is either missing or broken, it is better to repair it. Otherwise, your fuel mileage will suffer, and engine tuning will be difficult at best.
Juan
yeah, I believe the light goes on temporarily upon start up and alerts if your air filter is totally blocked, (as if that happens often!)
Hello,
Yes, the Diaphragm Subassembly is the "another valve." My mistake, it operates as an actuator for a flap below the filter housing.
And yes, the thermostatic valve is the one in red.
This is a picture I found to show how it looks. Sorry, I have not found a picture of the sensor.
Juan
- Thread starter
- #7
My intake doesn’t have the port for that thermostatic valve but it does have the air filter sensor. Might the filter housing or the cover a replacement? Did all Columbian 1FZ-F trucks have this system?
Mine:
This one is @ASO544 ’s and his doesn’t have it either, at least not in the same form as yours, @JuanJ
None of the FZJ73’s that have been listed on BringATrailer have this system either. I’m a bit puzzled.
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Hello,
Colombian 73 Series were essentially base grade soft tops. As such, chances are they lack emissions control systems.
There should be a hose to connect the exhaust manifold with the lower part of the air filter housing in the yellow circle.
The hose is missing, as is the thermostatic valve. This makes me think your truck does not have the emissions control system I mentioned above.
There should be a port in the air filter box for the sensor.
It is possible that the previous owner had the sensor disconnected and the lid port blocked.
On a side note, after seeing your battery terminals, it is no wonder your harness is toast.
Juan
Colombian 73 Series were essentially base grade soft tops. As such, chances are they lack emissions control systems.
There should be a hose to connect the exhaust manifold with the lower part of the air filter housing in the yellow circle.
The hose is missing, as is the thermostatic valve. This makes me think your truck does not have the emissions control system I mentioned above.
There should be a port in the air filter box for the sensor.
It is possible that the previous owner had the sensor disconnected and the lid port blocked.
On a side note, after seeing your battery terminals, it is no wonder your harness is toast.
Juan
- Thread starter
- #9
Ancient history! Harness fully rebuilt and everything works now. I think they’re stripping it out and wrapping it this week.
I’m very excited to dive into mechanics when I get it back. Spring is going to be very busy!
- Thread starter
- #10
Hello,
I am glad to hear that.
You should change your battery terminals and check your fusible links. The ones your truck has do not look OEM.
There is a fan in front of the radiator. A PO's addition, I guess. Does it work?
Juan
Hello,
It is not a scoop but a basic EGR system.
I guess you can cut it and use the spot for a turbo. Good idea.
Juan
- Thread starter
- #13
This thing hasn’t yet run for me, Juan. I do know it’s quite the basket case. I surrendered last fall after 7 months of very little progress and decided it was time to have someone help get me past the toe of the curve. The shop where it’s been since November has it running well and is just about done repairing the harness. I plan to replace the water pump, oil pump, fan clutch, radiator and front main seal in the spring so I’ll be able to sort out the extra fan then. My guess is that it ran hot and the owner’s solution was to add an electric fan rather than sorting out why it was running hot.
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