Missing hose
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FTE Chapter Leader
Joined: Nov 2006
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From: Fresno, CA.
Missing hose
Hello all,
Popped the hood today to take some pics of the engine for my album, and I noticed on the passenger side what looked like an oil breather cap for the valve cover. However, upon closer inspection I see it is attached to something, but has a provision for a hose. I can't see where that hose would go to though. Any ideas?
Jim
Popped the hood today to take some pics of the engine for my album, and I noticed on the passenger side what looked like an oil breather cap for the valve cover. However, upon closer inspection I see it is attached to something, but has a provision for a hose. I can't see where that hose would go to though. Any ideas?
Jim
Fleet Mechanic
Joined: Sep 2003
Posts: 1,716
Likes: 15
Others have described it as looking like the muffler on a small gas engine... and it is 
When air from the air pump is not being injected in the Thermactor system, it is dumped to the atmosphere. To quiet down the putt-putt-putt that would result, it is fed through the little muffler.
If you leave your engine idling for a while, the PCM will dump air via the TAB and TAD valves. When it is dumping, if you put your thumb over the muffler output, you can feel it pulse. You can hear it too, though it's not very loud.
Older Ford systems had a fiberglass filter stuffed into the end of either the TAB or TAD valve (I don't remember which), and the air would come through the filter and out slots in the valve's steel housing. Those would make a much louder putt-putt. Of course they were louder, they were glass-packs
When air from the air pump is not being injected in the Thermactor system, it is dumped to the atmosphere. To quiet down the putt-putt-putt that would result, it is fed through the little muffler.
If you leave your engine idling for a while, the PCM will dump air via the TAB and TAD valves. When it is dumping, if you put your thumb over the muffler output, you can feel it pulse. You can hear it too, though it's not very loud.
Older Ford systems had a fiberglass filter stuffed into the end of either the TAB or TAD valve (I don't remember which), and the air would come through the filter and out slots in the valve's steel housing. Those would make a much louder putt-putt. Of course they were louder, they were glass-packs
Thread Starter
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FTE Chapter Leader
Joined: Nov 2006
Posts: 21,092
Likes: 245
From: Fresno, CA.
Interesting bit of knowledge there. Glad it was designed like that, and not some half baked idea to bypass a emission device. I am told this Bronco will pass smog, and even has a smog test sheet to prove it, so I am not going to worry about that small muffler anymore. Thanks for the info.
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