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Dual Vacuum Solenoid
https://slantsix.org/forum/viewtopic.php?t=39191		 Page 1 of 1
Author:  jkotis [ Sat Feb 27, 2010 10:01 pm ]
Post subject:  Dual Vacuum Solenoid
I am restoring a 1986 Dodge D150 truck with a 225 in engine. It is equipped with a dual vacuum solenoid. It has four vacuum connections on one side and two on the other. One of the connections has no vacuum line (white arrow - that is currently plugged). Should there be a vacuum line connected to this vacuum port? I have studied the parts book and the service manual and cannot find a reference to the side of the dual vacuum solenoid with the two vacuum connections and the two electrical connectors. Should there be a Y connection from an intake manifold source for this connection? See photo below.


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Author:  SlantSixDan [ Sat Feb 27, 2010 10:42 pm ]
Post subject: 
Looks like one is your air switching solenoid valve, and the other is your EGR control solenoid valve. Note some solenoid ports are open to atmospheric, but have a foam filter pushed over that port to act as a filter. If the filter disintegrates over time, someone unfamiliar with the system might replace it with a cap. Check this diagram and see if your vacuum system matches up, or determine what's been disabled and/or removed.

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Author:  carlherrnstein [ Sat Feb 27, 2010 11:45 pm ]
Post subject: 
just a tip i have a 85 D100 if/when you replace the brake booster vacuum line be extremely care full :!: When i replaced mine the multi port aluminum hose barb broke off flush with the intake manifold :o :x :evil: very annoying. upon inspection the casting was vary porous it had bubbles 3/32 in diameter.
good lock
Author:  wjajr [ Sun Feb 28, 2010 5:47 am ]
Post subject: 
Side note to early 80’s engineering, or what were “Theyâ€￾ thinking department:

Dan, that plumbing nightmare looks not unlike the vacuum line rat’s nest under the hood of my 1982, 2.6 Hemi equipped Lebaron. Yup, the 2.6 L Mitsubishi diesel truck engine that was converted to gas, equipped with a funky reed valve pressurized exhaust recirculation system including a third “Jetâ€￾ valve per each cylinder and counter rotating balance shaft, turned sideways, and stuffed into many a K Car and fork lift. Oh yeah, the dreaded Mikuni carburetor, oh boy, what a joy that marvel can be. Thank God fuel injection was just a few model years down the road, luckily all of her under hood plumbing diagrams are in pristine condition.
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