Secondary actuator

[reags8]

While attempting to chase down a vacuum leak and rout the vacuum lines correctly after taking the intake off I developed a problem with the rear sec. actuator.
It is stuck closed - When I start the car both actuators are closed and when I shut it off the rear stays closed. I tried running the car up to 4,000 rpms to see if the rear would "free itself" and I can't tell you if it opened or not because the car is running like crap due to a vacuum leak. When I shut the car down it was stuck closed again. I can manually open it with the car off and it will close again at idle but not open when off.
I'm planning on taking the intake off and replacing all the vacuum lines that I can get to and the gaskets. While its off should I start looking for a replacement actuator ? Where ?
How much $$$ ?
Thanks

 

[sdpatt]

First, relax. Second, be aware that the black plastic canister on the rear intake plenum is a vacuum accumulator: a vacuum storage device. It is the purpose of this canister to keep the secondaries closed when required in times of low or no vacuum (read: engine off for at least a few minutes).

To verify that the spring in the actuator can open the secondaries you can remove the vacuum line from the solenoid to the actuators or the line at the actuator. The spring will open the butterflies when the vacuum is released - except when there is a physical obstruction to the butterflies.

Find that vacuum leak. From your description, it sounds like you have a leak at the front actuator that allows it to open quickly after the engine shuts off and the vacuum leaks down. Either that, or the rear bank actuator's vacuum line is pinched by the intake mainfold. Also check the routing of the vacuum hoses to the secondaries. See how the hoses should be routed in this topic.

 

[reags8]

Thanks for the help - I did use your vacuum routing discription from that other post to get the secondaries working again, so they are routed correctly.
As I stated I plan removing the intake and replace the lines along with the gaskets. If I disconnect the vacuum line to the secondary rear actuator (the one that is stuck) from the solenoid and it doesn't free itself what should I look for with the intake off ?
Reags

 

[sdpatt]

If you are certain that the actuator is jammed in the "open" position, check for obstructions to the free motion of the butterflies and the linkage. With the vacuum hoses disconnected from the actuator, the spring should keep the actuator's arm in the extended(?) position. If you move the shaft in the other direction, the spring should return it. If it doesn't return, the spring has failed.

 

[reags8]

OK I think I've stumbled across something.
The black cap on the top of the IAB is leaking air at idle - Is this normal ?
And my actuator is stuck in the closed positon not open. When I shut the car off it doesn't open like the front on its own. I tried unplugging the line to the vaccum res. and it stays shut. When the car is off I can open it with just a little pressure with a screwdriver.
Should I look into another actuator ? Is it stuck closed for good ?
Reags

 

[reags8]

I've got the intake off the car and the secondary actuator for the rear bank is "stuck" closed. All I have to do is just touch it with my finger and it will spring open.
does anyone know how to free it up ? I would like to put my intake back on tomorrow but if I need to swap out the actuator wouldn't it be easier with the intake off the car ?
Reags

 

[sdpatt]

You will have to determine what is interfering with the movement of the actuator. Something you did during the removal and replacement of the intake has obstructed the motion of the butterflies on that side. Did you remove the tubes from the plenums? Something is not lined up correctly.

 

[reags8]

I can tell you exactly what I did. This happened before I removed the intake. I had the routing of the vacuum lines all screwed up from the last time I removed the intake. While trying to figure out the correct routing I unplugged the line from the solenoid and plugged it directly into the "******" on the back of the intake facing the firewall. Immediately the rear actuator shut and from that point on it has been hanging up.
I have the intake off right now and am planning on putting it back on tonight - Should I swap out the actuator ? If I can find one !
Thanks for all the help.
Reags

 

[sdpatt]

It sounds like you damaged the rear bank's diaphragm actuator.

 

[reags8]

Where can I get one.

 

[green91SHOPlus]

they don't sell them at parts stores, I found that out. Mine's rattling, and I'm pretty sure it isn't supposed to... So yeah, forums: Anyplace new we can get them from? Ford part number or other cars these things were on?