Originally Posted by slick2500
Thanks Slick....
You first picture shows the end of the mystery line that plugs in to the nipple on the rubber intake duct just upstream of the throttle body, you can see its 90 degree elbow at the nipple at the bottom margin of the picture just to the right of center. That end I know about, its where the OTHER end connects, you can see the line running up to near the EGR valve, and then I think it heads down to a location on the back side of the engine, where a flared fitting on the other end must pop into whatever it connects to. Can't see what you are referring to in the second picture, too dark.
The mystery connection end has some oily residue on it, so I'm thinking either an oil trap vent on the crankcase or the purge line for an evaporative emissions control activated charcoal filter. For the time being, I have plugged the mystery end to prevent a big vacuum leak on the intake duct that will screw up the air fuel mixture downstream of the air mass meter.
