Question about 1993 Ford F250

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I HAVE LOST ALL VACUUM FROM THE ENGINE TO THE VACUUM MANIFOLD ON MY 1997 7.3 TURBO-DIESEL F250 4WD. WHERE CAN I FIND VACUUN SYSTEM DIAGRAM SO THAT I CAN TROUBLESHOOT IT?

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There is a vacuum pump on these since this engine does not develop any.It is driven by the fan belt.On the left front of engine i believe. Notorious for failure. Place a vacuum gage in /on suction port, should get a mimum of 18 in. hg. If ok check for broke hoses ,plastic lines,and fittings.Hope this helps. Please rate me.Thanks.

Posted on Jan 20, 2009

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Posted on Jan 02, 2017

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You don't say whether it is petrol or diesel and whether it is a turbo model and what sort of age it is.
The diesel versions are apt to become clogged throughout the egr valve and ports and the intake becomes very oily but a clean should only be needed about every year. This is not typical of the petrol engines.

The oil must be coming from somewhere and there must be quite a lot of it being turned into carbon/sludge in order to be blocking the egr valve so often and that might be at least part of the trouble. There is probably just as much oily carbon going down the exhaust so eventually the CAT will become so blocked it will increasingly rob the engine of power.

The butterfly valves in the intake manifold are part of a design that varies the length of the intake tract in order to increase volumetric efficiency over a wider engine speed range. The engine management decides when to switch the vacuum supply on. Fault diagnosis can be a rather involved and protracted procedure depending which engine is fitted.

I suggest the source of the oil should be investigated and recified if possible before you change the manifold, though removing the manifold could be part of the process of diagnosis. It could be leaking valve stem oil seals or a leaky turbo if fitted, or something more serious. The manifold probably doesn't need replacing and I think it producing more power after you fiddled with it is coincidence...

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  2. Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa).
  3. The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is NOT correct, record the pressure and remove the gauge.

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Suspect a problem with a check valve in the vacuum lines somewhere. When you ask for "power", the manifold vacuum dives. This is affecting your ventilation. It is not supposed to happen as you know.

Many ventilation controls use engine intake manifold vacuum as power to move miniature air valve actualtors. Actuators may be balanced by springs. Springs pull one way, vacuum (controlled by the dash knobs) pulls against springs. When the throttle is opened (accelerator pushed hard) the manifold vacuum drops.

When the vacuum drops, then the spring would be strongest and pull the control valve over. When the throttle goes back to normal--- vacuum is back up, and air flow changes again.

There should be a check valve in (one-way valve) in the system so that the vacuum is held during periods of acceleration. If this valve is stuck open by wear or contamination, everytime you ask for power you would lose the vacuum in the controls.

A full diagram of the system is needed to trace this which I do not have.

This should give you a place to start or at least know what you are hearing if you have someone troubleshoot this.

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