This is an easy question to answer, go to D:06:02 of your Workshop Manual for an explanation on how the "closed crankcase system" works. DMC Joe / DeLorean Services / <dmcjoe@xxxx> Web Site: <http://www.deloreanservices.com> > From: Marc A Levy <malevy@xxxx> > > I guess I never realy put much thought in to it, but I always assumed > that the PCV tube hooked to the air box was to suck the gasses out of > the crankcase. But then I got to thinking, where does the air come in > to the crankcase? > > I did a quick search on the net and found a good page that explains in > detail the PCV system (in general, not DMC specific) at > http://www.njautosite.com/garage/encyclop/ency08b.html > > Based on that page, it would seem that the tube attached to the air box > is where the air gets sucked in to the crank case. That kind of makes > sense now, because the vaccum would need to come from someplace beyond > the throttle plates. So, where does this vaccum come from? There is no > PCV valve, so I guess it uses some other method to acheive the desired > results. If the vaccum is taken from some place beyond the throttle > plates, then when I go in to boost the crankcase will then become > pressurized and in theory help push the oil out in to the air box! > > I guess I should also take a look at the hose routing diagram, but I did > not have time to do that yesterday. Either way, anyone have a good > explination on how the system work in the De Lorean, and where the vital > parts are? > > Thanks, > Marc