2008 cat engine SVP?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Sep 18, 2023.

  1. Perchie15

    Perchie15 Light Load Member

    Aug 16, 2021
    Not exactly sure on the engine model but it was one of the last cat engines. Anyway I’m having issues with the air building. Primary builds at a okay time but still longer than 3 mins it’s at like 60 at 8mins then finally secondary starts moving and I believe truck gets full air around 15mins revving at 1200!
    I changed the unloaders. Fairly new compressor by looks of it! And an air dryer filter. But if it takes forever to build in secondary what could be the issues?
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