07 isx builds pressure normally when idling to 130 psi but once you start driving it the compressor runs to 120 and purges. Drops to 110 in 15secs then compressor starts and goes to 120 and repeat. Purges more the higher the boost pressure but stops if you go out of gear and have no boost. Going to try cleaning unloader value but looking for suggestions can’t find anything similar online.
Isx purging under boost
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Karl10, Feb 20, 2025.
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