Edmunds Answers



  • MrShift@Edmunds 04/14/09 4:00 pm PST

    You might try squirting some starting fluid in the air intake. If the engine starts briefly then you know you have spark but no fuel delivery. Also check all your fuses carefully.

    I don't see how you could lose compression overnight--makes no sense.

    But just in case, here are the compression specs:

      • Standard: 830 kPa (8.5 kgf/cm2, 120 psi) [250 rpm]
      • Minimum: 680 kPa (6.9 kgf/cm2, 98.6 psi) [250 rpm]
      • Standard difference in chambers: Within 150 kPa (1.5 kgf/cm2, 21.8 psi)
      • Standard difference in rotors: Within 100 kPa (1.0 kgf/cm2, 14.5 psi)

  • trobertson 04/20/09 3:11 pm PST

    I took the car to the local mazda dealership and they de-carboned the engine and replaced the plugs and wires. They said the main cause of the problem was carbon buildup. They instructed me to run the engine around 6G every other day to keep carbon buildup to a minimum.

  • MrShift@Edmunds 04/20/09 3:24 pm PST

    Yes you do need to rev those engines. I wonder if another type of spark plug might be better suited to your driving conditions? Something to ask the dealer (if he even knows) or maybe you could mention that in the Edmunds RX8 forum

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