VAP

post yet another in what seems like a long line of suddenly "magic" and otherwise unsolveable mysteries. Just knowing that line sucks instead of blows solved that issue for me summarily and on-the-spot.

Also nice to know there really isn't even a trace of hot EGR exhaust gases passing thru that line that gets pulled into the engine. And to know that line is vacuum instead of positive pressure beause we can now do something that will add years to our EGR solenoid valve's life, ie; run a filter to it's "open end" to stop sucking in dirt, dust, silica and water-borne particultes when it rains. Otherwise we just traded oily, "carbony" wet vapor EGR valve contaminants for drier, more abrasive and wear-producing contaminants by removing the hose from the intake plenum and leaving it open to atmosphere.

Methinks a small-engine (think lawn mower/leaf blower) sealed plastic tiny lil fuel filter would be a blessing on that open line's end. Probably doesn't cost more than a buck or two and keeps fine particulate debris out of what "should" be a sealed valve. You can have oily blowby contaminated EGRV with line connected or dry sand contaminated EGRV with line open to atmosphere but without a filter at the end of that line you can only choose "one!" Remember what a "vacuum cleaner" is! An open vacuum line is little more than a small vacuum cleaner! It will reach out and pull ANYTHING in the air around its opening or on a surface within its range that will fit in its opening! It's not like you have to rely on some statistical long-shot stroke of luck for any foreign debris to find its way into that line... it's ingesting a TON of it EVERY single day the car is driven!!

I'm still thinking a small hose barb on the right front strut mount side of the airbox lid for that relief line hose as it gets my EGRV filtered vacuum relief without "adding" anything.

No harm done Mori but I'm glad this is finally resovled and understood and now makes PERFECT sense!

moribundman

I don't remember Audiboy ever saying the line was sucking. I shouldn't have assumed a direction of flow, but I don't even remember the details of making that diagram after all those years.

I'm glad another 12v mystery has been solved. Better late than never.

moribundman

I did date the image yesterday and uploaded it. I must have uploaded the undated one, but didn't notice because the cache remembered the updated image, which had the same file name like the old image. I uploaded the old image by accident, but the new updated image showed, because I had cleared the cache after deleting the old image. Yikes!


<img src="http://pictureposter.audiworld.com/50038/96_vacuum_revised.jpg">