Isx cm2250 engine brake choppy

[aaronb]

(02-24-2018 )Hammerhead Wrote:  How many miles on the unit aaronb?
Demandated or not?
Bypass filter or not?
Oil change interval?
It could be several things;
It could be soot saturated oil clogging up the oil galleries in the Jake system,
Soot saturated oil may also have stuck one or more of the Pistons on the Jake rockers,
The solenoids may be sticking or giving issues,
The Jake wiring harness and/or connectors may be going bad causing intermittent solenoid firing,
It could be worn detents and check valves in the rocker shafts, combined with weak springs in the Jake rockers,
Weak oil pressure makes that last one way worse,
Could be due or way overdue overhead adjustment,
Worst case scenario, the valve cam may be losing a lobe and about to cause a whole lot more and bigger issues.

The best way to find out is to pop the rocker cover and start inspecting things...

(02-23-2018 )aaronb Wrote:  ... How do I test the solenoids to see if it’s one of them?

The truck has 699,000 miles. The engine was rebuilt at 482,000. I'm not sure the reason for the rebuild. It still has the mandate. No bypass filter installed yet. I just bought the truck a couple months ago. I know the previous owner was running 20,000 mile oil changes. The overhead was just ran about 20,000 miles ago. I was driving the truck and bought from my boss. I'm planning on running the oil changes at 12,000 to 15,000 miles and adding a bypass filter. I'll try solenoid first and go from there. We're having freezing rain today and I don't have a shop to work in. Might be next weekend before I get a chance to check it out. Thanks.