LT1 Vacuum Line Question
Thread Starter
Racer
Joined: Oct 2012
Posts: 348
Likes: 28
From: Houston TX
LT1 Vacuum Line Question
Hi I am curious if anyone knows exactly what is all controlled by the vacuum line on the passenger side of the motor which leads into the cabin of the vehicle with the white and blue one way valve in the line. It is the line next to the one that goes to the fuel pressure regulator. My car no longer has AC, cruise control, egr, or the electric vacuum pump so I am wondering whether I still need these lines.
I have a 93 6 speed car and will post a picture of the line when I get home.
Thanks
I have a 93 6 speed car and will post a picture of the line when I get home.
Thanks
Instructor
Joined: Jun 2009
Posts: 109
Likes: 6
From: Scottsdale AZ
Hi I am curious if anyone knows exactly what is all controlled by the vacuum line on the passenger side of the motor which leads into the cabin of the vehicle with the white and blue one way valve in the line. It is the line next to the one that goes to the fuel pressure regulator. My car no longer has AC, cruise control, egr, or the electric vacuum pump so I am wondering whether I still need these lines.
I have a 93 6 speed car and will post a picture of the line when I get home.
Thanks
I have a 93 6 speed car and will post a picture of the line when I get home.
Thanks
ince you mentioned your A/C and cruise control no longer function this is the source for both of them. It is not uncommon for that Check valve to fail, and the cost to replace it is under $10.00. However, you may also want to check the black vacuum hoses that are connected to the cruise control module located above the battery on the left side. The one which runs from the module through the fire wall and connects to the brake pedal usually rots away, this renders the crusie control inactive. Also check the black plastic vacuum hose which runs from a "T" connector to behind the battery and into the thick wire harness.The plastic vacuum line deteriorates from the fumes emitted from the battery. You may have to peel back some of the harness wrap to get to the remaining segment of that vacuum hose to make the repair. This I believe controls the A/C programmer module which moves the various vent doors changing the A/C airflow inside the car. Your photo shows the check valve which looks like it wa replaced once before. You are at the vacuum source at the point of the photo. Follow the above mentioned vacuum lines and things should work after that.
Sledge_78
Last edited by sledge_78; Feb 16, 2015 at 06:38 AM.
Thread Starter
Racer
Joined: Oct 2012
Posts: 348
Likes: 28
From: Houston TX
Sorry I might have been unclear in my initial post. I physically deleted all of those systems to reduce weight. The car is not a daily driver. I am just wondering if I will lose the functionality of any additional systems if I cap off that vacuum port at the manifold.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
Sorry I might have been unclear in my initial post. I physically deleted all of those systems to reduce weight. The car is not a daily driver. I am just wondering if I will lose the functionality of any additional systems if I cap off that vacuum port at the manifold.
Thread Starter
Racer
Joined: Oct 2012
Posts: 348
Likes: 28
From: Houston TX
Cool thanks for the help. I feel it would be best to cap it at the manifold that way I dont risk a vacuum leak in a rotted away line somewhere in the cabin or something like that. Rather than just capping the line at the removed parts.
