I've got a 2015 Intl with an ISX. It's an old Knight truck I'm working the bugs out of. So I've put a brand new air dryer on it, but the air compressor still has a habit of dropping very low, but only at idle, not while driving. I've run PB blaster through it like Cummins does with WD-40 to revitalize the reed valve, but either I didn't use enough or it's just worn out.
I guess my question is, should I rebuild the head, replace the head, or replace the whole compressor? It only has 535,000 miles, but just over 17,000 hours run time. I'd like opinions from those with more experience than I, thanks guys!