Hi there! I'm desperately looking for ser4vice (shop) manuals for a 93 SSEi, or at least an engine diagram so I can find out where everything is located. The boost gauge in my car shows negative boost and I want to troubleshoot the whole SC system. Can't find the Boost Control and other parts.
Any ideas for a link to such a diagram? I appreciate it.

boost will be negative during idle, you should get about 7-8psi from WOT. during a normal acceleration it should be at about zero.

the circled part is the boost control sylanoid

I agree. Sounds normal to me, unless you can be more specific. You also won't see boost unless you're in a drive gear. Revving at idle won't do much. It'll bypass based on PCM command.

You may be also having problems with the manifold pressure sensor.

OK! So that'* the solenoid! Now, isn't there also some kind of other bypass/blowoff valve as well in the system?
Thanks for your help.

Where'* the manifold pressure sensor located? Can it be checked by meassuring resistance?

The MAP sensor is a rectangle shaped thing that sits behind the supercharger on the driver'* side. I'm not sure of the specs on it, I'll have to look them up.

The bypass valve actuator is the black round thing above the solenoid.

I was wondering, are those good-and-plenty candies you have stuck in those vacuum lines???

And Will, the SC is bypassed at idle? That must be why you can start and idle with no SC belt.

Don't know how to attach diagram