LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

vacum line undr the TB what does it do? i broke it

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Old Apr 6, 2004 | 11:54 AM
  #1  
93transam1234's Avatar
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vacum line undr the TB what does it do? i broke it

like i said i brok mine tried to fix it with a lil tape, doesnt seem to be working what does it do?
Old Apr 6, 2004 | 12:33 PM
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Re: vacum line undr the TB what does it do? i broke it

Originally posted by 97formula1234
like i said i brok mine tried to fix it with a lil tape, doesnt seem to be working what does it do?
Should be the line that runs from the PCV valve on the drivers side of the intake manifold. Check the emissions hose routing diagram on the radiator cover panel to verify. That is the connection that supplies the vacuum to pull the crankcase vapors out through the PCV valve.
Old Apr 27, 2004 | 12:16 PM
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no not the one going to the PCV it is under that. it started at this lil box looking thing on the passenger side (the vacum pump i guess) and goes under the TB and over the drivers side valve cover below where the PCV one is.

I guess i just have to fix it...
Old Apr 27, 2004 | 12:36 PM
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It goes to the EGR,
You can plug it if you've blocked off the EGR.
Old Apr 27, 2004 | 01:05 PM
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Sounds like an EVAP line to me.
Old Apr 27, 2004 | 01:29 PM
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yeah thats the one shoebox the that goes under th TB and makes a "u turn beside the valve cover"

What does that do and should i replace it
Old Apr 27, 2004 | 01:35 PM
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i broke mine too. i just used a rubber vaccuum line end and cut it so i could connect the two broken pieces. plugged it back in and no probs yet.
Old Apr 27, 2004 | 02:43 PM
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Originally posted by sabre81
i broke mine too. i just used a rubber vaccuum line end and cut it so i could connect the two broken pieces. plugged it back in and no probs yet.
I was going to suggest that very thing for a cheap fix.

The EVAP system pulls vapors from the gas tank, then burns them with the air and fuel during combustion. If you leave it broken you will likely smell gas fumes and also have a small vacuum leak any time the solenoid is energized. I'll dig up a part number for the plastic hose and edit the diagram to include it.
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