Isx cm2250 engine brake choppy

[Hammerhead]

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?