Mazda RX-7 Service and Adjustment Specifications: compression, ignition, throttle specifications and more

Mazda RX7 1993-1995 FD3S

CAPACITIES

BATTERY SPECIFICATIONS

• AT
  • Amp Hr. Rating: 52
• MT
  • Amp Hr. Rating: 43

FLUID CAPACITIES

• Crankcase (Includes Filter):
  • Quantity: 4.0 Qts. (3.8L)
• Cooling System (Includes Heater)
  • Quantity: 9.2 Qts. (8.7L)
• Manual Transmission, Use SAE 75W-90 for all-season conditions, and SAE 80W-90 for temperatures greater than 50°F (10°C).
  • Quantity: 2.6 Qts. (2.5L)
• Automatic Transmission, Use ATF M-III or Dexron-II.
  • Quantity: 9.1 Qts. (8.6L)
• Rear DifferentialUse SAE 90 for temperatures greater than 0°F (-18°C), and SAE 80W for temperatures less than 0°F (-18°C).
  • Quantity: 1.4 Qts. (1.3L)

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QUICK-SERVICE

SERVICE INTERVALS AND SPECIFICATIONS

REPLACEMENT INTERVALS

• Air Filter: 30,000
• Camshaft Timing Belt: 60,000
• Coolant: 30,000
• Engine Oil
  • Non-Turbo: 7500
  • Turbo: 5000
• Engine Oil Filter
  • Non-Turbo: 7500
  • Turbo: 5000
• Fuel Filter: 60,000
• Spark Plugs: 30,000

BELT ADJUSTMENT (NEW BELT)
Measure belt deflection by applying moderate pressure, about 22 lbs. (10 kg), to belt, midway between pulleys.

• Generator: 15/64 - 9/32 (6-7) In. (mm)
• AC Compressor: 1/8 - 5/32 (3.5-4) In. (mm)
• Power Steering: 1/8 - 5/32 (3.5-4) In. (mm)

MECHANICAL CHECKS

ENGINE COMPRESSION

Warm engine to normal operating temperature. Remove all spark plugs. Disconnect ignition coil primary wire connector. Hold throttle plate fully open. Crank engine and note compression pressure.

COMPRESSION RATIO

• Mazda RX7 1993-1995: 9.0:1

COMPRESSION SPECIFICATIONS

• Mazda RX7 1993-1995: Difference between cylinders should not be more than 21 psi (1.5 kg/cm2 ).
  • Minimum psi (kg/cm2 ) @ RPM: 100 (7.0) @ 250

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IGNITION SYSTEM

IGNITION COIL

IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)

• Leading
  • Primary: Below 1.0
  • Secondary: Below 1.0
• Trailing
  • Primary: Below 1.0
  • Secondary: 9600-16,000

CRANKSHAFT POSITION SENSOR

CRANKSHAFT POSITION SENSOR RESISTANCE - Ohms @ 68°F (20°C)

• Mazda RX7 1993-1995: 950-1250

HIGH TENSION WIRE RESISTANCE

High tension wire resistance should measure 16,000 ohms per 3.28 feet (1.0M) at 68°F (20°C).

High Tension Wire Routing
For high tension wire routing, see Fig. 1 .

Fig. 1: Identifying High Tension Wire Location

SPARK PLUGS

SPARK PLUG TYPE

• Leading
  • NGK No.: BUR7E-QP
• Trailing
  • NGK No.: BUR9E-QP

SPARK PLUG SPECIFICATIONS

• Mazda RX7 1993-1995:
  • Gap: In. (mm): .044-.066 (1.1-1.7)
  • Torque: Ft. Lbs. (N.m): 13 (18)

Fig. 2: Identifying Leading and Trailing Spark Plugs and Gap

IGNITION TIMING

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

• Leading
  • Man. Trans.: 5 @ 720
  • Auto. Trans.: 5 @ 720
• Trailing
  • Man. Trans.: 20 @ 720
  • Auto. Trans.: 20 @ 720

Fig. 3: Identifying Leading and Trailing Timing Marks

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FUEL SYSTEM

FUEL PUMP

Fuel pump performance measures fuel pressure, not regulated fuel pressure.

FUEL PUMP PERFORMANCE

• Mazda RX7 1993-1995: 72-107 (5.0-7.5) (kg/cm2)

REGULATED FUEL PRESSURE

• Mazda RX7 1993-1995
  • At Idle W/ Vacuum: 27-32 (1.9-2.3) (kg/cm2)
  • At Idle W/O Vacuum: 36-38 (2.5-2.7) (kg/cm2)

INJECTOR RESISTANCE

INJECTOR RESISTANCE - Ohms @ 68°F (20°C)

• Mazda RX7 1993-1995: 13.8 Ohms

IDLE SPEED AND MIXTURE

IDLE SPEED SPECIFICATIONS

• Mazda RX7 1993-1995: Connect jumper wire between terminals TEN and GRD of data link connector.
  • MT and AT: 720 RPM

DASHPOT SPECIFICATIONS

• Mazda RX7 1993-1995: 2600-3000 RPM

THROTTLE POSITION (TP) SENSOR

TP SENSOR VOLTAGE

• Wire Color To Ground To Ground
  • Green/Red (3F)
    • Closed Throttle Volts Volts: .75-1.25
    • WOT Volts Volts: 4.8-5.0
  • Black/Green (3G)
    • Closed Throttle Volts Volts: .0.1-0.7
    • WOT Volts Volts: 4.2-4.6

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Mazda RX7 1993-1995 FD3S

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