Thought I'd give this a shot before I go to Mack ok. I have a 06 Mack Granite CV713 with a AI 460 when I brought it I had to replace the oil pan. So I did an oil & filter change plus a radiator flush. Also have codes 8-2 8-5 & 3-1. I know the 8-2 & 8-5 are for the EUP's & the 3-1 is for the exhaust. Had a mechanic tell me the air compressor had went out & that was the reason for the oil coming out from top of filters. Had that replaced & problem still exist has anyone else had this issue. Also truck is making a muffled backfire now. Mechanic told me the backfire was from the EUP's. I saw online where a guy rebuilt his EPU's talked to Mack dealer & they said they dont sell rebuild kits. So do anyone know where to buy kits or do I need to buy new EUP's?
