Identify this part please
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Trailering
Joined: Sep 2018
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From: SoCal
Identify this part please
This hose with the valve like thing in the middle was connected to big port in the PCV Valve and other end in manifold vacuum under EGR spacer, What is it? is there the correct conection?
FTE Legend
Joined: Nov 2015
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From: Angier, NC
Think someone said it was a hot air compensator.
IIRC it causes a vacuum leak that raises the idle speed so the fan spins faster cooling the motor.
I have only seen them on 460 motors. Is yours a CA emissions truck?
Dave ----
IIRC it causes a vacuum leak that raises the idle speed so the fan spins faster cooling the motor.
I have only seen them on 460 motors. Is yours a CA emissions truck?
Dave ----
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Curious that it would operate based on underhood temperature. Seems that value would be all over the place, influenced by road speed, engine load, etc. Compare that to something like coolant temperature, which would be much more uniform.
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From: Sheffield, AL
FTE Legend
Joined: Nov 2015
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From: Angier, NC
Do I need it
Do we know when its to work and what / why it's to do?
The way I see it if it is not causing a vacuum leak just sitting there and only when it is saposto then what's the harm in leaving it?
Dave ----
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Great info! Found this link in there, lots of details here:
Hot Idle Compensator Valve
https://secure.cougarpartscatalog.co...mpensator.html
From the last link:
"When the ambient under hood temp increases to a certain point the bi-metallic strip on the hot idle compensator opens a rubber needle - brass seat metered orifice, causing what is essentially a vacuum leak of a predetermined amount into the intake system. This extra air will in turn cause the idle speed to increase, moving more air through the radiator and water through the cooling system due to increased fan and water pump speed the result being the motor will cool down to the point where the ambient under-hood temp is lower, and the valve closes and the vacuum leak will stop, returning the engine to a normal idle speed.This cycle repeats itself over and over. Obviously this will only help during periods of engine idle. Remember, this was engineered in the early sixties and in theory is workable. What normally happened is that IF the little rubber needle valve did lift from the brass seat and cause the idle to increase, it sometimes would not seat properly when cooler, and caused an erratic idle. Most were tossed in the garbage back in the day. In the real world, this little device probably caused more problems than it solved! It had a somewhat short life, was kind of a band-aid fix, and was replaced with a bigger and better cooling system as more and more Ford products were sold with factory A/C."
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Trailering
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Trailering
Joined: Sep 2018
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From: SoCal
Interesting. That looks like a bimetallic element on the top, and probably "uncorks" the port at the top of the body when hot.
Curious that it would operate based on underhood temperature. Seems that value would be all over the place, influenced by road speed, engine load, etc. Compare that to something like coolant temperature, which would be much more uniform.
Curious that it would operate based on underhood temperature. Seems that value would be all over the place, influenced by road speed, engine load, etc. Compare that to something like coolant temperature, which would be much more uniform.
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Trailering
Joined: Sep 2018
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From: SoCal
Well, now that I know the name of this thing "hot idle compensator valve" I have found some more information about it and appears that it was in the right place according to information from the page mentioned in above link provided by kr98664 "It is installed in the middle of the hose that connects the PCV valve to the rear of the carburetor spacer."
The question now is, should I leave it in place or remove it? I'm putting back together intake/exhaust manifold, carb, egr, changing all vacuum lines, etc. If I put it back I'll be closely monitoring it for possible malfunction.
I purchased this truck about a couple months ago, it's pretty straight, the truck sat for about 20 years, it was running and I drove it around the block but was running really rich, lots of vacuum leaks, but this hot idle compensator valve looks in great shape. thank you to everybody for your input.
The question now is, should I leave it in place or remove it? I'm putting back together intake/exhaust manifold, carb, egr, changing all vacuum lines, etc. If I put it back I'll be closely monitoring it for possible malfunction.
I purchased this truck about a couple months ago, it's pretty straight, the truck sat for about 20 years, it was running and I drove it around the block but was running really rich, lots of vacuum leaks, but this hot idle compensator valve looks in great shape. thank you to everybody for your input.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
If so then what can you remove and still pass your smog test?
That valve may be on the CARB list as needing to be in place?
Just my .02
Dave ----
That valve may be on the CARB list as needing to be in place?
Just my .02
Dave ----
Post Fiend
Joined: Feb 2008
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From: St Albert, Alberta
Well, now that I know the name of this thing "hot idle compensator valve" I have found some more information about it and appears that it was in the right place according to information from the page mentioned in above link provided by kr98664 "It is installed in the middle of the hose that connects the PCV valve to the rear of the carburetor spacer."
The question now is, should I leave it in place or remove it? I'm putting back together intake/exhaust manifold, carb, egr, changing all vacuum lines, etc. If I put it back I'll be closely monitoring it for possible malfunction.
I purchased this truck about a couple months ago, it's pretty straight, the truck sat for about 20 years, it was running and I drove it around the block but was running really rich, lots of vacuum leaks, but this hot idle compensator valve looks in great shape. thank you to everybody for your input.
The question now is, should I leave it in place or remove it? I'm putting back together intake/exhaust manifold, carb, egr, changing all vacuum lines, etc. If I put it back I'll be closely monitoring it for possible malfunction.
I purchased this truck about a couple months ago, it's pretty straight, the truck sat for about 20 years, it was running and I drove it around the block but was running really rich, lots of vacuum leaks, but this hot idle compensator valve looks in great shape. thank you to everybody for your input.
Just leave it in place it is not hurting anything and may help prevent hot idle stumbles. If your truck is A/C equipped then definitely leave it in place. They are pretty much bulletproof and basically never fail. And are far more reliable than the throttle kickers or the VCVs that replaced them.
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Trailering
Joined: Sep 2018
Posts: 23
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From: SoCal
yes it looks like this valve it's in great shape, I'm going to leave it in place. That's true, it my be in the CARB list.
As I mentioned above, I'm replacing all vacuum lines, does anybody know where I can find the filters that insert in the vacuum control valve or thermal ported vacuum switch?
As I mentioned above, I'm replacing all vacuum lines, does anybody know where I can find the filters that insert in the vacuum control valve or thermal ported vacuum switch?
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