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96 | 4.6
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Discussion Starter #1
Taking the air cleaner out to reach the spark plugs, I notice that these two connections are loose. What are these, and are they often so loose? You can see the hosing in pic 1 is in poor condition. Is this something I can pick up at a parts store?

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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Correct, the passenger side is the PCV valve that constantly draws gases and any blow-by from the crankcase in for combustion. The driver's side is a vent to allow filtered, metered air back into the crankcase to displace that which is drawn into the engine via the PCV valve.
 

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96 | 4.6
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Discussion Starter #4
Passenger side is a PCV and the driver side I think is just a breather.

Both are readily available at parts stores and if you get a nice dude he might just give you a small piece of hose. Bring it in to match up the size but I wanna say its a 5/8 hose.
5/8 seems right, thanks for the tip! Seems snug. I was going to clamp it down just in case, but I probably shouldnt be clamping plastic. For others, here is a related thread I found:

 
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