Vacuum help needed
Thread Starter
Pro
Joined: Aug 2007
Posts: 509
Likes: 8
From: Livonia Michigan
Vacuum help needed
Have a 1987 stock engine. Found what looks like a vacuum check valve in the bottom of the engine compartment. I remember connecting a vacuum hose from the rear of the intake plenum to a check valve near the firewall but I see in a repair manual a picture of a check valve connected to a short hose that is connected to the throttle body on the side with the throttle linkage.
I've searched all thru the FSM and only found one vacuum check valve. Is there two vacuum check valves on an 87 vette?
I've searched all thru the FSM and only found one vacuum check valve. Is there two vacuum check valves on an 87 vette?
Last edited by MotorCity_87_C4; Jul 29, 2009 at 11:16 PM.
Safety Car
Joined: Jan 2008
Posts: 3,939
Likes: 1
From: Vero Beach Florida
My 87 only has only one check T -valve drivers side rear near dizzy, bottom line runs to A/C, line is in main loom rear of motor, middle line goes to cruise control, top is vacuum supply connection is rear of plenum passenger side.
This is the routing of the other lines but it dose not show the T-valve in the rear, Just shows the A/C feed port. I guess if you had a car without cruise you would'nt need the valve
This is the routing of the other lines but it dose not show the T-valve in the rear, Just shows the A/C feed port. I guess if you had a car without cruise you would'nt need the valve
Last edited by floridamale; Jul 30, 2009 at 06:31 AM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The ball stores vac so your cruise and HVAC don't drop out when engine manifold vac drops ; like when accelerating
Last edited by rodj; Jul 30, 2009 at 09:29 AM.
