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Old 03-25-2012, 04:32 PM   #1
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Vacuum Line Missing...any ideas where it goes?

Ok guys, under the hood today I noticed that I have a vacuum line missing from underneath the throttle body. Not sure if this might have anything to do with some of the other issues I'm currently having or not. Anybody know where this line is supposed to run to?



Couldn't find any decent enough images on google to determine where it goes. The car is a 99 Z28 LS1...thanks!
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Old 03-25-2012, 04:52 PM   #2
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You sure it's a vacuum line and not the throttle body coolant line?
Is it pulling a vacuum when the engine is running if you stick your finger on it?
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Old 03-25-2012, 05:35 PM   #3
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I was thinking coolant line as well because my 86 tpi had a coolant line running through the throttle body as well. But yeah it is pulling a slight vacuum when running, which has me baffled.
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Old 03-25-2012, 06:47 PM   #4
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Is there not a diagram on a sticker under the hood?
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 217k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles
26PPH injectors.
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Old 03-26-2012, 03:59 AM   #5
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That's a throttle body coolant line. It's a common mod to disconnect the coolant lines from the throttle body to lower intake air temperatures.
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Old 03-26-2012, 09:44 AM   #6
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Sorry for the thread hijack. What does disconnecting that line do? I mean are there any negative affects from having it disconnected?
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Old 03-26-2012, 09:51 AM   #7
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The throttle body can ice up in cold wet weather.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 217k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles
26PPH injectors.
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Old 03-26-2012, 09:54 AM   #8
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Okay. Does the 3.8 have one? Will anything leak if you un do it?
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Old 03-26-2012, 10:02 AM   #9
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Not sure about a 3.8, but yes you need to plug the ends of the lines when you disconnect them or you'll have a coolant leak.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 217k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles
26PPH injectors.
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Old 03-26-2012, 10:04 AM   #10
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Okay. Thanks
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Old 03-26-2012, 01:18 PM   #11
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The 3.8 throttle body does have engine coolant going through it, and you can't really block it off except by making a custom throttle body gasket, since the coolant running through the intake manifold routes through the throttle body gasket. I've never head of anybody doing it... Not sure if it's "safe" or not.

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Old 03-26-2012, 02:45 PM   #12
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Yeah I was in the engine looking around but did see the coolant line. So I guessed it was something like that. Thanks for clearing it up for me!
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Old 03-26-2012, 07:16 PM   #13
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Yup, the tb can ice up in winter driving because there is not coolant running through it to keep it from freezing. And yes it was the coolant line bypass, still puzzles me why there is a bit of vacuum running though it...
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Old 03-26-2012, 07:17 PM   #14
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Quote:
Originally Posted by BigMac76 View Post
Yup, the tb can ice up in winter driving because there is not coolant running through it to keep it from freezing. And yes it was the coolant line bypass, still puzzles me why there is a bit of vacuum running though it...
Put a cap on it.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 217k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles
26PPH injectors.
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