Hey, I have a 87' N/A and want to know if my 5th and 6th ports are working? How can I tell?

 

Most of the time you can rev the motor up your drive way using the throttle in the engine bay, and you can watch them move. Mine werent moving, but my precat was clogged up. Once I got the new exhaust system in, and sealed the gaskets, they open fine now. Another way is to put grease on the shafts and go for a good hard drive. If the grease has been moved up on the shafts, you know they work...

Rat

 

Anyone have any pictures of the location of the ports?

 

I can go take one if you want...

 

Here is a close-up of the rear port actuator...Best I could do, its too dark.

Rat

 

One more time...

 

Is that it? I thought it was something diff. Does anyone else have any more pictures? I really need to know i want to get this fixed. I am pretty sure it is what the problem is. Tha and my BAC but fixing that this weekend

 

Nope! That is it...
You can clearly see them on the pass. side of the motor right obove the exhause manifold. The circled part is the shaft and linkage to the diaphram which turns the ports to open. On 86-88 models you can take the hose off that goes to the diaphram and suck on it and you should be able to see the shaft from it pop out (or simply move i should say). On 89-91 models you have to blow on the hose to see the shaft pop out.

 

Actually, you blow on the vac line for 86-88. The actuators work on backpressure from the exhaust. I can take better pics, but I am at work right now. The actuators are supposed to work with about 1.5-2 PSI of backpressure. But as they get older, they become harder to open. Mine open around 2-2.5 PSI.