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Dear gregorythomas,
Hope you're well. I use as a reference, in what follows, a B230FD engine, installed in a '94 940. I stood beside the engine, on the driver's side, at a point on the fender, where the wheel well's arch reaches its highest point (relative to the ground).
At the top of the intake manifold, there is a vacuum hose, that attaches to a port on the intake manifold, just behind the front-most hex bolt of the throttle spool bracket (the bolt head closest to the front of the engine). From the manifold's port, the vacuum hose runs towards the firewall, on which is mounted a major wire harness.
What follows is included on the off-chance it will be helpful. That major wire harness is enclosed by a black corrugated plastic sheath, about 1" (25mm) in diameter. That major wire harness runs towards the passenger side of the engine bay.
The vacuum hose is clipped to that major wire harness, and enters a black-and-white vacuum check valve. When the vacuum hose exits the check valve, it enters a down-ward pointing corrugated black plastic protective sleeve, about 3/8" (10mm) in diameter. The vacuum hose emerges from that protective sleeve and enters a black rubber nipple on the firewall. That rubber nipple is behind the heater hoses.
If your manifold does not have the above-described port, then it is possible that the intake manifold was replaced. However, the replacement unit did not match exactly the factory-original unit. As a result, your intake manifold lacks the port, above-described.
In that event, a "T" splice might suffice. At a Home Depot / Lowe's you should be able to get a brass "T" in hose barb format, that can be used to join vacuum hoses. Such a brass "T" will have arms about 3/16" in diameter.
Hope this helps.
Yours faithfully,
Spook
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