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Author Topic: Purpose of pipe coming off the exhaust manifold?  (Read 1279 times)

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Offline Walston

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Purpose of pipe coming off the exhaust manifold?
« on: May 05, 2016, 09:13:26 PM »
So there is a ~3/4" pipe that comes off the exhaust manifold, it goes towards the front, has a coil for cooling, goes through what looks like an air conditioning dryer, then a hose that goes to the air cleaner. I assume this is some kind of emission devise. What does it do and do I need it? I would like to use a smaller air cleaner (Weber) and need to know if I need to keep this thing.
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Offline blupinto

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Re: Purpose of pipe coming off the exhaust manifold?
« Reply #1 on: June 11, 2016, 07:41:07 PM »
What size engine do you have?
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Offline pinto_one

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Re: Purpose of pipe coming off the exhaust manifold?
« Reply #2 on: June 11, 2016, 09:14:26 PM »
Sounds like you got some smog stuff that was half removed , like the smog pump and hand full of vacuum lines ,
Post some photos of what you have now , a picture is a thousand words 🔩

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Offline 65ShelbyClone

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Re: Purpose of pipe coming off the exhaust manifold?
« Reply #3 on: June 11, 2016, 09:42:24 PM »
I looked at the 1977 2.3L parts car I have and it doesn't have anything matching that description. It has an air line from the smog pump to the exhaust manifold and an EGR line from the exhaust manifold to the intake manifold.

On your engine it sounds like EGR-related parts to me.
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Offline D.R.Ball

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Re: Purpose of pipe coming off the exhaust manifold?
« Reply #4 on: June 14, 2016, 12:39:54 PM »
Are you in California ? What year will the car be registered as ? Pre 1974 get rid of it! After 1975 it's part of the Thermactor system for emissions. This system was used on most Ford cars until the EEC-IV came out. So if you have to have it you should be able to get parts. That dryer as you called is an air bypass valve or the air bypass valve. As per the Ford Car Shop Manual 1975-1976.
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