How to Use Seafoam on a 300Zx


Sea Foam motor treatment is used to liquefy fuel deposits and remove internal engine contamination. It also removes carbon deposits, can help free stick lifters, reduce pinging, eliminate throttle hesitation and improve the quality of the idle. When Sea Foam is used as a fuel additive, the product stabilizes fuel for up to two years. In addition, it can clean injectors, remove fuel deposits from the fuel line and lubricate the upper cylinders of the 300ZX.

Things You'll Need

  • Sea Foam Engine Treatment - Liquid
  • Sea Foam Engine Treatment - Spray
  • Assistant

Engine Cleaner

  • Pour 1/3 of the can of Sea Foam Engine Treatment into the crankcase.

  • Drive the 300ZX normally for two to three days.

  • Drain the engine oil. Replace the oil and filter.

Fuel System Cleaning

Sea Foam Spray

  • Start the engine. Allow the engine to warm up. Turn the engine off. Disconnect the air intake tube from the throttle body of the engine.

  • Attach the Sea Foam Spray hook guide to the inside lip of the throttle body, pointing toward the throttle plate. Push the red cleaning tube into the hook guide until the throttle body end of the red tube is about 1/4 inch from the throttle plate.

  • Connect the free end of the red cleaning tube to the spray can of Sea Foam. Connect the air intake tube to the throttle body over the top of the hook guide.

  • Instruct an assistant to start the engine. Wait 15 seconds, then instruct the assistant to press the gas pedal to raise the engine speed 500 to 1,000 RPM higher than idle. Instruct the assistant to hold the engine RPM steady during the injection of Sea Foam into the engine.

  • Spray 1/2 of the can of Sea Foam into the throttle. This process will take 2 to 3 minutes. Turn the engine off. Wait 10 minutes

  • Start the engine. Accelerate it to approximately 2,000 RPM. White smoke may billow out from the tailpipe, this is normal. Continue holding the advanced RPM until the smoke appears to stop or slow significantly.

  • Drive the vehicle around the neighborhood until all exhaust is cleared.

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