Air Dryer is affecting My engine Idle

Check yor purge valve. It's a little plastic cup on the bottom of the dreyer. There's a snap ring in there, once you get that out wiggle very lightly the black cup and it should come out. Chek your o rings for any cuts if they have any replace them with the correct size. Also this could need replaced. Be sure to build the new one side by side the old one. Also there is a govenver on the side of your dreyer that could also be a the problem. If you need a new dreyer e sure to build it side by side the old one. Go easy putting the fittings into the new dreyer as its brass into aluminum. Of they break off don't use ez outs they don't work. Makes the problem worse. Take a pick and beat the brass out then take a 18-24 pipe fitting tap and retread the holes.


Note this is how I've done it on Pete's and Freightliners. I take no responsibility for what happens when you do these things.



ps if your purge valve goes ch ch ch ch ch after building air once after you've checked it ad your can put your palm over the black cup and if it "sucks up" and builds air like normal then repeats this problem pull the valve back out and check your o rings again of this continues you mostly likely need a new dreyer

 

Put your palm on it and a very light pressure and let me know if it "sucks up"

 

I came all the way home from Minnesota one night/day (to western Kentucky) on the day before Christmas Eve and everyone was shut down shop wise. And I had to push that valve up on the dreyer every time the air built up an blew off. It sucked. I used te jakes alot that trip jome