Quote:
Originally Posted by Matt L
No "it's been said" about it. A gas engine develops considerable vacuum at idle, and more at cruise. Almost none during acceleration. At full throttle, any vacuum generated is working against your goal of getting as much air as possible into the engine.
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I could understand it better if I had a gas engine, but I have a diesel. Vacuum is gererated by a gear driven pump on the front of the engine. I would think that the faster the engine speed - the greater the amount of vacuum. Upon acceleration (not necessarily full throttle) the air immediately diverts from the center vents to the defrost vents. Let off the pedal and it diverts back. Looks like a leak in the system would be the same always, not just at acceleration. I have noticed, especially at night, that the windshield fogs up on the bottom by the vents and has done this for years. I think I have had this problem a long time and it has just recently gotten worse. I noticed something was wrong on a hot day driving on the interstate, everytime I let off the gas the air would all the sudden blow harder out the middle vents. I ordered a Mity vac kit and as soon as it comes in, I will get to the bottom of this problem and post what I find. I attached a file of my hose routing but I have removed all the ones going to the egr and vacuum transducers associated with turbo boost regualtion.