Vacuum Advance
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Mountain Pass
Joined: Apr 2015
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Vacuum Advance
If you have a 1987 Ford F250 /350 with a 460 v8 could you please look and see where your vacuum hose goes to , from the vacuum diaphragm, on the distributor to where???
Thanks for looking , Gene
Thanks for looking , Gene
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I edited in a screenshot.
I don't have it on my phone.
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From: Over There
Edit.. NVM he's in Commiefornia
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pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
The valve steps up the idle speed when the coolant sensor reacts to overheating.
(fan turns faster and pump cycles more coolant through the engine)
(fan turns faster and pump cycles more coolant through the engine)
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From: Over There
I thought the temp valve was to turn the EGR off until the engine warmed up, but now I see in that diagram/remember that there are two. I don't care one bit about being stock or the EGR, but that sounds like a worth while feature to have.
You have any idea what temp the valve trips and how I can tell which is what, IIRC they are colored different?
EDIT...
Wait, now I'm confused, I'd never set it up like stock, but I could see using that valve to perform that function. However I'm confused about how it's set up stock. What does it have to do with vacuum advance?
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
The valve switches between the two sources. (one with a vacuum restriction (VREST) and full manifold vacuum, which pulls in more timing, increasing the idle speed.
the valves have different colors, that I think denotes the temperature.
the valves have different colors, that I think denotes the temperature.
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From: Over There
Ford engineer "Let's detune this engine through a complicated mess of superfluous vacuum lines, fittings and valves. That way it will be more likely to fail, get worse mileage, have less power, and overheat. That is until it actually overheats, then we'll give it proper timing, can't be replacing whole engines on warranty."
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Mountain Pass
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I checked this gray 2 port switch in my t-stat housing for the EGR, it is closed cold and opens to let vacuum through at 150 degrees , that works I guess.
Thermostat stuck while testing so I changed it again and used a Fel-Pro black and orange gasket #35041T cause I used the funky paper gasket when I changed the Tstat last week and it weeped a little, well the fel pro gasket leaked as soon as I started it. I've had enough for today I'm beat. Tomorrow I'll deal with my water leak and try moving the vacuum advance hose to the middle port.
Thanks for all your help guys , Gene
Thermostat stuck while testing so I changed it again and used a Fel-Pro black and orange gasket #35041T cause I used the funky paper gasket when I changed the Tstat last week and it weeped a little, well the fel pro gasket leaked as soon as I started it. I've had enough for today I'm beat. Tomorrow I'll deal with my water leak and try moving the vacuum advance hose to the middle port.
Thanks for all your help guys , Gene
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Sometimes the thermostat housing has been overtightened and the ears become warped.
If you have a piece of wetordry sandpaper you can try lapping it flat using water to suction the paper to something flat like a counter top or plate glass.
Always work it in a figure eight motion.
This might solve your coolant leak.
If you have a piece of wetordry sandpaper you can try lapping it flat using water to suction the paper to something flat like a counter top or plate glass.
Always work it in a figure eight motion.
This might solve your coolant leak.
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