is my air governor going bad?

Every governor I have changed on my trucks was due to cycling abnormally. Fixed it everytime, it would kick on before it needed to and kick off before it needed to. Like the other guy said they are twenty bucks tops unless truckstop if you have never installed one on your truck it's a good item to change and keep your old one just incase. May not be the answer to your problem but definately a no brainier part.

 

Most air govenors that fail are caused by the truck being washed with chemicals and it getting in the exhaust port. I always buy an 1/8 vent plug. The reason you want to take the time to find the exact problem and fix it right the first time is that diagnosis by the ripping and tearing method gets expensive.
If you want to do it that way buy a new compressor. a new air dryer, a new governor, a new discharge line, new 1/4 inch air lines new 1/8 to #4 fittings, and just to be sure replace the tail lights.
OR you can use 20 cents of soapy water and 20 minutes of you time.
Just a thought!

 

X2 as most likely problem

 

I change the air dryer cartridge every 6 months .... 2 years seems to long .

 

Rollin, you could change just the purge valve, but you said it's been two years since you changed the cartridge. On my truck I can get a whole new dryer for just a few dollars more than a cartridge and purge valve. Give fleet pride a call and price a new dryer assembly.

 

I've never been a fan of rebuilding a dryer. Bolt a new one on and be done with it.....

 

It should only spit air when it activates(the pop sound it makes when it shoots the moisture out). Should seal tight otherwise. If money is tight and you need too watch your pennies right now, you can take it out and clean it up and replace the orings. But if you can afford it, I'd just change the whole thing.