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04-23-2005, 06:48 AM | #1 |
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Location: Lanton, MO
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vacume mod
well I'm stumped on this and even the good old guys at autozone couldnt help............
I got a late model c4 (70-82 only reason i know is because of the filter) But the modulater has 2 vacume ports a 1/4 inch and a 1/8 inch, anyone know what the second ports for and where in the heck does it hook up?? |
04-29-2005, 06:59 PM | #2 |
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Re: vacume mod
everyone else must be stumped on this too
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04-29-2005, 08:33 PM | #3 |
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Re: vacume mod
Sorry.
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04-30-2005, 06:47 AM | #4 |
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Re: vacume mod
crap got excited when i seen a reply
I'm assumming its a secondary vacume since its smaller, just dont know why 70-82 c4 trannys gotta have two ports...
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04-30-2005, 09:51 AM | #5 |
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Re: vacume mod
Ok being a Ford parts Mgr for 35 years I've seen these listed but never saw one on a car. It is called an Altitude Compensating type. I think they were used one cars built for high altitude locations. I would get a standard valve and replace it. Don't know what the purpose of the other line is or where it goes. Hope this helps.
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04-30-2005, 09:23 PM | #6 |
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Re: vacume mod
That's interesting... seeing Coors is in MO... don't think that would be necessary...
Good info. |
04-30-2005, 10:20 PM | #7 |
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Re: vacume mod
home of st louis MO (home of that aweful budweiser and elevation under 1000 ft ) and when i bought the car originally in southern cal
all the parts stores in both states have the same vacume mod.......... the 70 to 82 C4 is a better tranny because of the 26 spline but what the hell is the second vacume port is for?????
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05-01-2005, 10:21 AM | #8 |
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Re: vacume mod
Might sound crazy...
But any chance that this is something to do with an early model cruise control? |
05-01-2005, 10:58 PM | #9 |
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Re: vacume mod
Thought I explained it???
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05-02-2005, 04:50 AM | #10 |
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Re: vacume mod
they dont sell any standard modulators for it, all of them have 2 ports sticking out
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05-02-2005, 01:53 PM | #11 |
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Re: vacume mod
I had the same question 4 years ago. When I got our 68, it also had a late model C-4 tranny in it with the same modulator. The previous owner had about a 4-inch tube on the other port going nowhere (open). I was afraid to plug it or remove the tube, since I had no clue what it was for, so I just left it hanging there. Tranny runs great so I haven't messed with it since. But, I would still love to know what it was originally for, or if I should cap it.
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05-03-2005, 09:06 PM | #12 |
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Re: vacume mod
the smaller port or the larger port?
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05-04-2005, 03:44 PM | #13 |
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Re: vacume mod
The open tube (about 4 inches long going nowhere) is hooked to the small port of the modulator on mine, while the large port is hooked to about a 4-inch rubber tube which hooks to a steel tube running to the top back of the engine. Where the pipe ends next to the engine, I have another 4-inch rubber tube hooked on that end which hooks to the engine. Like I said, I never knew if any of this was hooked up correctly so I left it alone. The car (and transmission) have run great in the 4 years since it was restored so I left well enough alone.
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