I just completed a head gasket job on my 3.4 engine and I seem to have a mystery vacuum line I cannot find where it goes. There are3 metal vacuum tubes sitting on top of the fuel injection. The thinner tube has a "T" on it and I found one end of it not hooked up to anything. For now I stuck a yellow cap on it. Can someone tell me when this goes??

Also on I side note when I hooked the wire harness to the TPS (throttle position sensor) I noticed a connector not connected to anything. It is so short nothing will reach it. Maybe its not used on my engine but was curious what it was for.

Regards,

Mike

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Mine heads to a check valve and then to the controls for the ADD diff/hubs VSV......original from the factory. On a swapped engine, hard to say...you should have a loose tube someplace.

 

typically that is just a 90* elbow .. I would think someone had a gauge plumbed into that line ..


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Mine straight from the factory 95.5 5vz-fe is a "T", not a 90* with the ADD diff/hubs.

 

absolutely .. and that looks like a factory " T " .. and possible explanation of it being blocked off , maybe the previous owner went with manual hubs ? IDK? .. I was just offering some more info for the fella ...

edit .. ohh I guess I didn't read enough .. you just did the head gasket ! sorry , I missed that .
so yeah , obviously it had to be hooked up to something

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Unless, it's been uncapped and not noticed? I see in another post he's going to leave it capped and see how it goes.

 

My 3.4 had that port originally capped also. I used that port to connect to the cruise control vacuum servo. Mine is vacuum operated, later ones are not.