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.
| Application | Minimum psi (kg/cm 2 ) @ RPM | Standard psi (kg/cm 2 ) @ RPM |
| B2300 & B2500 | (1) | (1) |
| B3000 & B4000 | (1) | (1) |
| Miata | 146 (10.3) @ 300 | 198 (13.9) @ 300 |
| Millenia (2) |
| 2.3L | 120 (8.5) @ 250 | 164 (11.5) @ 250 |
| 2.5L | 130 (9.3) @ 300 | 189 (13.3) @ 300 |
| MPV | (1) | (1) |
| Protege (2) |
| 1.6L | 142 (10.0) @ 300 | 199 (14.0) @ 300 |
| 2.0L | 119 (8.4) @ 300 | 171 (12.0) @ 300 |
| Tribute |
| 2.0L | (1) | (1) |
| 3.0L | (1) | (1) |
| 626 (2) |
| 2.0L | 119 (8.4) @ 300 | 171 (12.0) @ 300 |
| 2.5L | 141 (9.9) @ 250 | 202 (14.2) @ 250 |
| (1) Lowest compression reading should not be less than 75 percent of highest compression reading. (2) Difference between cylinders should not be more than 28 psi (2.0 kg/cm 2 ). |
| (1) | Lowest compression reading should not be less than 75 percent of highest compression reading. |
| (2) | Difference between cylinders should not be more than 28 psi (2.0 kg/cm 2 ). |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | (1) In. (mm) |
| Except Miata, Millenia 2.3L, Protege & 626 | (2) |
| Miata |
| Intake | .008-.009 (.18-.24) |
| Exhaust | .012-.013 (.28-.34) |
| Millenia 2.3L | .011-.013 (.27-.33) |
| Protege |
| 1.6L | .010-.012 (.25-.30) |
| 2.0L | .009-.012 (.23-.30) |
| 626 |
| 2.0L | .009-.012 (.23-.30) |
| 2.5L |
| Intake | .010-.013 (.25-.32) |
| Exhaust | .011-.013 (.27-.34) |
| (1) Adjust valves with engine cold. (2) Engines are equipped with hydraulic valve lash adjusters. Valve clearance is not adjustable. |
| (1) | Adjust valves with engine cold. |
| (2) | Engines are equipped with hydraulic valve lash adjusters. Valve clearance is not adjustable. |
VALVE CLEARANCE SPECIFICATIONS
IGNITION COIL
| Application | Primary | Secondary |
| B2300, B2500, B3000 & B4000 | (1) | (1) |
| Miata | (1) | 7,000-11,000 |
| Millenia 2.5L | .49-.73 | 20,000-31,000 |
| MPV | .45-.55 | 11,500-15,500 |
| Protege | (1) | 7,000-12,000 |
| Tribute | (1) | (1) |
| 626 |
| 2.0L | .45-.55 | 11,500-15,500 |
| 2.5L | .45-.55 | 11,500-15,500 |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
CRANKSHAFT POSITION SENSOR
| Application | Ohms @ 68°F (20°C) |
| B2300, B2500, B3000 & B4000 | 300-800 |
| Miata | (1) |
| Millenia |
| 2.3L | 950-1250 |
| 2.5L | 520-580 |
| MPV | 315-385 |
| Protege | (2) 550 |
| Tribute | 300-800 |
| 626 | (2) 550 |
| (1) Information is not available from manufacturer. (2) Specification given is approximate. |
| (1) | Information is not available from manufacturer. |
| (2) | Specification given is approximate. |
CRANKSHAFT POSITION SENSOR RESISTANCE
HIGH TENSION WIRE RESISTANCE
On B2300, B2500, B3000 and B4000, high tension wire resistance should measure 22,900 ohms per 3.28 feet (1.0M) at 68°F (20°C). On all other models, high tension wire resistance should measure 16,000 ohms per 3.28 feet (1.0M) at 68°F (20°C).
SPARK PLUGS
| Application | NGK No. |
| B2300 | (1) AGSF-3ZFEM |
| B2500 | (1) AWSF-32F |
| B3000 |
| Left Head | (1) AWSF-32P1 |
| Right Head | (1) AWSF-32PG |
| B4000 |
| Left Head | (1) AGSF-22PG1 |
| Right Head | (1) AGSF-22P1 |
| Miata | (2) BKR5E-11 or (3) BKR6E-11 |
| Millenia |
| 2.3L | (2) PZFR5F or (3) PZFR6F |
| 2.5L | (2) ZFR5F-11 or (3) ZFR6F-11 |
| MPV | (1) AWSF-32F |
| Protege |
| 1.6L | (2) ZFR5F-11 or (3) ZFR6F-11 |
| 2.0L | (2) BKR5E-11 or (3) BKR6E-11 |
| Tribute 2.0L |
| Cylinders No. 1 & No. 3 | (1) AZFS-32F |
| Cylinders No. 2 & No. 4 | (1) AZFS-32FE |
| Tribute 3.0L | (1) AWSF-32F |
| 626 |
| 2.0L | (2) BKR5E-11 or (3) BKR6E-11 |
| 2.5L | (4) (2) PKJ16CR8 or (3) PKJ20CR8 |
| (1) Motorcraft spark plug number. (2) Standard plug. (3) Cold plug (4) Nippon Denso spark plug number. |
| (1) | Motorcraft spark plug number. |
| (4) | Nippon Denso spark plug number. |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
| B2300, B2500 & B3000 | .042-.046 (1.1-1.2) | 7-15 (9-20) |
| B4000 | .052-.056 (1.3-1.4) | 10-14 (14-20) |
| Miata & Protege | .040-.043 (1.0-1.1) | 11-16 (15-22) |
| Millenia |
| 2.3L | .028-.031 (.7-.8) | 11-16 (15-22) |
| 2.5L | .039-.043 (1.0-1.1) | 11-16 (15-22) |
| MPV | .051-.055 (1.3-1.4) | 7-15 (9-20) |
| Tribute | .052-.056 (1.3-1.4) | 11 (15) |
| 626 |
| 2.0L | .039-.043 (1.0-1.1) | 11-16 (15-22) |
| 2.5L | .028-.031 (.7-.8) | 11-16 (15-22) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Firing Order & Coil Pack (B2300). Scheme 1
Scheme 1: Firing Order & Coil Pack (B2300)
Firing Order & Coil Pack (B2500). Scheme 2
Scheme 2: Firing Order & Coil Pack (B2500)
Firing Order & Coil Pack (B3000 & B4000). Scheme 3
Scheme 3: Firing Order & Coil Pack (B3000 & B4000)
Firing Order (Millenia 2.3L). Scheme 4
Scheme 4: Firing Order (Millenia 2.3L)
Firing Order & Distributor Rotation (Millenia 2.5L). Scheme 5
Scheme 5: Firing Order & Distributor Rotation (Millenia 2.5L)
Scheme 6
Scheme 6: Firing Order & Coil Pack (MPV 2.5L)
Scheme 7
Scheme 7: Firing Order & Coil Pack (Tribute 2.0L)
Scheme 8
Scheme 8: Firing Order (Tribute 3.0L)
Firing Order & Coil Pack (626 2.0L). Scheme 9
Scheme 9: Firing Order & Coil Pack (626 2.0L)
Firing Order & Coil Pack (626 2.5L). Scheme 10
Scheme 10: Firing Order & Coil Pack (626 2.5L)
Ignition Coil Identification (Protege 1.6L Shown; Miata 1.8L & Protege 2.0L Are Similar). Scheme 11
Scheme 11: Ignition Coil Identification (Protege 1.6L Shown; Miata 1.8L & Protege 2.0L Are Similar)
IGNITION TIMING
| Application | Man. Trans. | (1) Auto. Trans. |
| B2300, B2500 & B3000 | 10 @ Idle | 10 @ Idle |
| B4000 | (2) | (2) |
| Miata | 9-11@ 750-850 | 9-11@ 750-850 |
| Millenia |
| 2.3L | N/A | 6-8 @ 600-700 |
| 2.5L | N/A | 9-11 @ 600-700 |
| MPV (3) | N/A | 4-16 @ 700-800 |
| Protege | 9-11 @ 650-750 | 9-11 @ 650-750 |
| Tribute | 8-12 @ Idle | 8-12 @ Idle |
| 626 |
| 2.0L | 6-18 @ 550-850 | 6-18 @ 500-800 |
| 2.5L | 4-16 @ 550-750 | 4-16 @ 550-750 |
| (1) Place automatic transmission in Park. (2) Information is not available from manufacturer. (3) Connect a jumper wire between terminals TEN and GND of data link connector. (Scheme 12) |
| (1) | Place automatic transmission in Park. |
| (2) | Information is not available from manufacturer. |
| (3) | Connect a jumper wire between terminals TEN and GND of data link connector. (Scheme 12) |
IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)
Scheme 12
FUEL PUMP
Note. Fuel pump performance measures fuel pressure, not regulated fuel pressure.
| Application | Pressure psi (kg/cm 2 ) |
| B2300 | 35-55 (2.5-3.9) |
| B2500, B3000 & B4000 | 54-71 (3.8-5.0) |
| Miata | 92 (6.5) |
| Millenia |
| 2.3L | 91-116 (6.4-8.2) |
| 2.5L | 71-92 (5.0-6.5) |
| MPV | 85-114 (6.0-8.0) |
| Protege | 64-92 (4.5-6.5) |
| Tribute | 35-65 (2.5-4.5) |
| 626 | 68-92 (4.8-6.5) |
| Application | At Idle W/ Vacuum psi (kg/cm 2 ) | At Idle W/O Vacuum psi (kg/cm 2 ) |
| B2300, B3000 & B4000 | (1) | (1) |
| Miata | (2) | (2) |
| Millenia |
| 2.3L | 30-41 (2.1-2.9) | 40-48 (2.8-3.4) |
| 2.5L | 30-38 (2.1-2.7) | 38-46 (2.7-3.2) |
| MPV | (2) | (2) |
| Protege | 30-36 (2.1-2.6) | 39-45 (2.7-3.2) |
| Tribute | (1) | (1) |
| 626 |
| 2.0L | 30-38 (2.1-2.7) | 37-47 (2.6-3.3) |
| 2.5L | 30-37 (2.1-2.6) | 38-46 (2.7-3.2) |
| (1) Information not available from manufacturer. (2) Due to adoption of mechanical returnelss fuel system, the pressure regulator cannot be inspected separately. |
| (1) | Information not available from manufacturer. |
| (2) | Due to adoption of mechanical returnelss fuel system, the pressure regulator cannot be inspected separately. |
INJECTOR RESISTANCE
| Application | Ohms |
| B2300 | 11-13 |
| B2500, B3000 & B4000 | 11-18 |
| Miata | 12-13 |
| Millenia | 13.8 |
| MPV | 14.5 |
| Protege | 14.2-14.8 |
| Tribute | 11-18 |
| 626 | 12-16 |
INJECTOR RESISTANCE - Ohms @ 68°F (20°C)
IDLE SPEED & MIXTURE
Note. Idle mixture is not adjustable. If idle mixture is incorrect, see appropriate SELF-DIAGNOSTICS article.
| Application | Man. Trans. RPM | (1) Auto. Trans. RPM |
| B2300 | N/A | 800-950 |
| B2500 | 760-830 | 760-820 |
| B3000 | 760-800 | 880-920 |
| B4000 | 760-800 | 760-830 |
| Miata | 750-850 | 750-850 |
| Millenia | N/A | 600-700 |
| MPV | N/A | 700-800 |
| Protege | 650-750 | 650-750 |
| Tribute |
| 2.0L | 800-900 | N/A |
| 3.0L | N/A | 730-750 |
| 626 |
| 2.0L | 550-850 | 500-800 |
| 2.5L | 550-750 | 550-750 |
| (1) Place automatic transmission in Park. |
| (1) | Place automatic transmission in Park. |
IDLE SPEED SPECIFICATIONS
THROTTLE POSITION (TP) SENSOR
Note. For information on connector terminal identification and test conditions specified in the following tables, see ON-VEHICLE ADJUSTMENTS article.
TP SENSOR CONTINUITY (MILLENIA 2.3L)
| Test Condition (1) | (2) Continuity Between Terminals "C" & "D" |
| Millenia (2.3L) |
| .007" (.19 mm) | Yes |
| .015" (.37 mm) | No |
| (1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. (2) (Scheme 13) |
| (1) | Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. |
TP SENSOR CONTINUITY (MILLENIA 2.3L)
Scheme 13
TP SENSOR RESISTANCE (MILLENIA 2.5L, MPV, PROTEGE & 626)
| Test Condition (1) | (2) Ohms |
| Millenia (2.5L) | 2900-5300 |
| MPV | 3200-4800 |
| Protege |
| 1.6L | 2500-6000 |
| 2.0L | 4000-6000 |
| 626 |
| 2.0L | 4000-6000 |
| 2.5L | 2500-5000 |
| (1) With throttle closed. (2) Between terminals "A" & "C". (Scheme 14) |
TP SENSOR RESISTANCE (MILLENIA 2.5L, MPV, PROTEGE & 626)
Scheme 14
TP SENSOR VOLTAGE (ALL MODELS)
| ECM/PCM Wire Color (1) | Closed Throttle Volts (2) | (2) Wide Open Throttle Volts |
| B2300, B2500, B3000, B4000 & Tribute |
| Gray/White (89) | .49 | 4.65 |
| Miata |
| Green/Black (4V) | .1-1.1 | 3.0-4.6 |
| Millenia |
| Yellow/Green (3B) | .1-1.1 | 2.8-4.5 |
| MPV |
| Brown/Yellow (89) | .1 | 4.9 |
| Protege |
| 1.6L |
| Brown/Yellow (89) | .1-1.1 | 3.0-4.6 |
| 2.0L |
| Brown/Yellow (89) | .1-1.1 | 3.0-4.6 |
| 626 |
| 2.0L |
| Violet/Yellow (89) | .3-0.7 | 3.4-5.3 |
| 2.5L |
| Violet/Yellow (89) | .4-0.5 | 3.5-4.4 |
| (1) Measure voltage between ground and ECM/PCM terminal No. in parentheses. (2) Voltage measurement should change gradually and smoothly as throttle is opened. |
| (1) | Measure voltage between ground and ECM/PCM terminal No. in parentheses. |
| (2) | Voltage measurement should change gradually and smoothly as throttle is opened. |
TP SENSOR VOLTAGE (ALL MODELS)