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

Vaccum problem!

Old 04-29-2019, 11:09 PM
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Vaccum problem!

Does anyone have or know of an easy to read diagram or detailed video on how to route all vaccum hoses without the smog pump on a 97 lt1?
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Old 04-29-2019, 11:31 PM
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Re: Vaccum problem!

Probably depends whether the AIR pump recall was done on your car. Appears they added a vacuum operated shutoff valve, put a tee on the intake manifold vacuum nipple for the Opti vent system, and ran a vacuum line from the tee to the shutoff valve. Does your car have the shutoff valve and the vacuum line?

Courtesy of Shoebox

http://shbox.com/1/air_pump_recall.jpg
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Old 04-30-2019, 03:41 AM
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Re: Vaccum problem!

I don't remember seeing the shutoff valve but I'm not the one who took it apart so I'm not sure on that, I'm just trying to finish someone elses work you know how that can be I'm sure
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Old 04-30-2019, 06:09 AM
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Re: Vaccum problem!

Basically, any vacuum that would have gone to the AIR pump, you just cap off at the manifold.
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Old 04-30-2019, 07:11 AM
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Re: Vaccum problem!


Ok thanks guys I think I pretty much have it now except Idk if the point on the throttle body drivers side right under the throttle cables is a vacuum or steam line
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Old 04-30-2019, 11:46 AM
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Re: Vaccum problem!

Originally Posted by Dro2135 View Post
Ok thanks guys I think I pretty much have it now except Idk if the point on the throttle body drivers side right under the throttle cables is a vacuum or steam line
That capped fitting on your throttle body would have had a hose coming from the radiator. It appears that someone did the 'throttle body bypass' mod. There is no vacuum at that point.
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Old 04-30-2019, 02:20 PM
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Re: Vaccum problem!

Originally Posted by Dro2135 View Post

Ok thanks guys I think I pretty much have it now except Idk if the point on the throttle body drivers side right under the throttle cables is a vacuum or steam line
The fitting on TB that is capped is for coolant. That has been bypassed, good. The one hard line that goes to the rubber elbow under the TB is vacuum and if original very likely needs replacing
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Old 04-30-2019, 02:26 PM
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Re: Vaccum problem!

Except from the picture, doesn't appear to be capped (hard to tell). And of course it doesn't have to be. From an appearance point of view, I put a vacuum cap on it, and another on the similar connection on the opposite side. It's a coolant passage.


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Old 04-30-2019, 02:30 PM
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Re: Vaccum problem!

And this is the rubber elbow that is referenced above:

Courtesy of Shoebox.

http://shbox.com/1/pcv_pipe.jpg
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