HT4100 4.1, 4.5, 4.9 Discussion, EGR System photos 83 4.1 in Cadillac Engine Technical Discussion; Could someone please post a couple of pics of their EGR vacuum solenoid and valve system. I'm trying to piece ...
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: EGR System photos 83 4.1
The solenoid has 3 nipples. 2 facing forward, one facing back to the EGR valve. The upper nipple facing forward should have NO hose to it. The lower nipple has ported vacuum to it. The rear facing one goes to the EGR valve. The upper nipple, from the factory, had a little foam filter on it to keep residue out of the solenoid. It is not a vacuum nipple, its a vent for the solenoid.