Miata Technical Service Bulletin

Section Applicable Model(s) Subject
Bulletin No. 003/99
Issued 03/04/99
F (01) 1999 Miata Engine hard to start/ excessive cranking time

Applicable Model(s)/VINS

All 1999 Miatas with VINs lower than JM1NB35** X0 122622


Hard starting or excessive cranking time may occur on some vehicles. This may be caused by foreign substances entering the fuel system during vehicle production. The substances may accumulate at the fuel pressure regulator valve causing it to stick open. Production and handling procedures have been changed to prevent this condition. Customers complaining of this concern should have their vehicles repaired using the following procedure.

Repair Procedure

  1. Inspect the fuel hold pressure (five minutes after turning the key to the 'OFF' position). For detailed procedure, refer to the Workshop Manual (section 01).
    If the fuel hold pressure is less than 250 kPa (2.55 kgf/cm2, 36.3 psi) , replace the pressure regulator with a modified part.
    If the fuel hold pressure is more than 250 kPa (2.55 kgf/cm2, 36.3 psi) , there is no problem in the fuel pressure regulator. Refer to the troubleshooting guide in the Workshop Manual.
  2. Verify repair.

Parts Information

Part Number Description Qty. Notes
BP4W 13 280 Pressure Regulator 1 -

Warranty Information


Warranty Type Code: A
Symptom Code: 02
Damage Code: 93
Part No. Of Main Cause BP4W 13 280
Quantity: 1
Operation No./ Labor Hour: F0306XRX / 0.7

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