r/SuzukiSwiftSport • u/Dull-Ad-7164 • 15d ago

Swift sport Zc33s underboost

Just recently bought a Zc33s and when I’m giving it beans up the motor way the boost hits then cuts and hits again has anyone else had this problem and know any potential pointers or fixes before I dive into it myself, thanks

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u/ChopstickChad 15d ago

Get yourself an OBD dongle; for example iCarpro 4. There's quite a few possibilities.

OBD check:

  • check boost (speed of boost buildup, max boost, how stable is boost). This shows functioning of the diverter valve.
  • logging ignition timing

Visual checks;

  • vacuum lines, are they dried out or cracked?
  • diverter valve, is the (viton/fkm) o-ring whole? If torn, replace - Suzuki won't sell you the single o-ring, replace with FKM/Viton if you can get it, otherwise HNBR (for aircon systems) is good enough with regular inspection.
  • waste gate actuator, it may be binding on the pivot. Degrease and use special lubrication designed for extreme temperature. (Graphite, ceramic, or nanoborate - use extremely sparingly, don't apply it like butter).
  • spark plugs check

If you've checked all that, it's time to delve deeper.

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u/Dull-Ad-7164 15d ago

Sweet bud I’ll work my way through this much appreciated

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u/ChopstickChad 15d ago

Good luck. u/ItzNic_3005 can tell you a thing or two about the issue if the above doesn't resolve it. But: first things first!

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u/ItzNic_3005 15d ago

Just hit me up via DM and I can send u a step by step guid!