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Engine Controls - Specifications: Other Mazda MX-5 NA

Specifications 10 illustrations ~476 words

ENGINE COMPRESSION

  1. Warm engine to normal operating temperature. Remove all spark plugs. On Navajo, use remote starter switch to crank engine (DO NOT crank engine with ignition switch). On all other models, disconnect ignition coil primary wire connector.
  2. On all models, hold throttle plate fully open. Crank engine, and note compression pressure.
ApplicationSpecification
B22008.6:1
B2600i8.4:1
Miata
Auto. Trans.9.4:1
Manual Trans.9.0:1
MPV
2.6L8.4:1
3.0L8.5:1
MX-3
1.6L9.0:1
1.8L9.2:1
MX-6
2.0L9.0:1
2.5L9.2:1
Navajo9.0:1
Protege
DOHC9.0:1
SOHC8.9:1
RX79.0:1
323
California9.3:1
Federal9.0:1
626
2.0L9.0:1
2.5L9.2:1
9299.2:1

COMPRESSION RATIO

ApplicationSpecifications
Compression Pressure
B2200173 psi (12.2 kg/cm 2 ) @ 300 RPM
B2600i182 psi (12.8 kg/cm 2 ) @ 270 RPM
Miata192 psi (13.5 kg/cm 2 ) @ 300 RPM
MPV
2.6L185 psi (13.0 kg/cm 2 ) @ 280 RPM
3.0L164 psi (11.5 kg/cm 2 ) @ 300 RPM
MX-3
1.6L185 psi (13.0 kg/cm 2 ) @ 300 RPM
1.8L192 psi (13.5 kg/cm 2 ) @ 300 RPM
MX-6
2.0L171 psi (12.0 kg/cm 2 ) @ 300 RPM
2.5L203 psi (14.3 kg/cm 2 ) @ 250 RPM
Navajo(1)
Protege
DOHC182 psi (12.8 kg/cm 2 ) @ 300 RPM
SOHC173 psi (12.2 kg/cm 2 ) @ 300 RPM
RX7100 psi (7.0 kg/cm 2 ) @ 250 RPM
323192 psi (13.5 kg/cm 2 ) @ 300 RPM
626
2.0L171 psi (12.0 kg/cm 2 ) @ 300 RPM
2.5L203 psi (14.3 kg/cm 2 ) @ 250 RPM
929213 psi (15.0 kg/cm 2 ) @ 270 RPM
Minimum Compression Pressure
B2200121 psi (8.5 kg/cm 2 ) @ 300 RPM
B2600i142 psi (10.0 kg/cm 2 ) @ 280 RPM
Miata135 psi (9.5 kg/cm 2 ) @ 300 RPM
MPV
2.6L142 psi (10.0 kg/cm 2 ) @ 280 RPM
3.0L121 psi (8.5 kg/cm 2 ) @ 300 RPM
MX-3142 psi (10.0 kg/cm 2 ) @ 300 RPM
MX-6
2.0L119 psi (8.4 kg/cm 2 ) @ 300 RPM
2.5L142 psi (10.0 kg/cm 2 ) @ 250 RPM
Navajo(1)
Protege
DOHC128 psi (9.0 kg/cm 2 ) @ 300 RPM
SOHC121 psi (8.5 kg/cm 2 ) @ 300 RPM
RX779 psi (5.5 kg/cm 2 ) @ 250 RPM
323135 psi (9.5 kg/cm 2 ) @ 300 RPM
626
2.0L119 psi (8.4 kg/cm 2 ) @ 300 RPM
2.5L142 psi (10.0 kg/cm 2 ) @ 250 RPM
929157 psi (11.0 kg/cm 2 ) @ 270 RPM
Maximum Variation Between Cylinders
Miata, Protege & 32328 psi (2.0 kg/cm 2 )
Navajo(1)
RX721 psi (1.5 kg/cm 2 )
All Others(2)
(1) Measurement of lowest cylinder must be within 75 percent of highest cylinder. (2) Information is not available from manufacturer.
(1)Measurement of lowest cylinder must be within 75 percent of highest cylinder.
(2)Information is not available from manufacturer.

COMPRESSION PRESSURE SPECIFICATIONS

VALVE CLEARANCE

Note. All piston engines are equipped with hydraulic valve lash adjusters. Valve clearance is not adjustable.

IGNITION COIL

ApplicationPrimarySecondary
B2200
Carbureted1.0-1.36000-30,000
PFI.81-.996000-30,000
B2600i.81-.996000-30,000
Miata.78-.9411,200-15,200
MPV
2.6L (4-Cyl.)
Right Side.77-.956000-30,000
Left Side900-1100N/A
3.0L (V6).81-.996000-30,000
MX-3
1.6L.81-.9910,300-16,000
1.8L.58-.8611,500-18,500
MX-6 & 626.58-.8611,500-18,500
Navajo.5(1)
Protege & 323.81-.9910,000-16,000
RX7
Leading0-1.09600-16,000
Trailing0-1.0Infinity
929
Left Side.77-1.09000-17,000
Right Side900-1100N/A
(1) Information is not available from manufacturer.
(1)Information is not available from manufacturer.

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

DISTRIBUTOR SENSORS

Note. For models not listed in tables, see BASIC DIAGNOSTIC PROCEDURES article for crank angle sensor testing.

ApplicationOhms
B2200 (Carbureted)900-1200
MPV 3.0L
Check Ignitor Terminals
"COM" & "Ne"205-255
"COM" & "G1"205-255
"COM" & "G2"205-255
(1) Other distributors use LED or Hall-Effect sensors.
(1)Other distributors use LED or Hall-Effect sensors.

DISTRIBUTOR PICK-UP COIL RESISTANCE (1)

ApplicationOhms
MX-3 1.8L (At Crankshaft Pulley)520-580
MX-6 & 626 2.5L (At Crankshaft Pulley)520-580
RX7 (At Crankshaft Pulley)950-1250
929 (At Crankshaft Pulley)950-1250

CRANK ANGLE SENSOR RESISTANCE

HIGH TENSION WIRE RESISTANCE

High tension wire resistance should not exceed 4900 ohms per foot (7000 ohms per foot on Navajo).

High Tension Wire Routing (RX7)

For RX7 high tension wire routing (Scheme 2)

Scheme 2

Scheme 2: High Tension Wire Routing (RX7)
Scheme 2: High Tension Wire Routing (RX7)

SPARK PLUGS

ApplicationNGK No.
B2200
CarburetedBPR5ES or BPR6ES
PFIBPR5ES-11 or BPR6ES-11
B2600iZFR5F-11 or ZFR6F-11
MiataBKR5E-11, BKR6E-11 or BKR7E-11
MPVZFR5F-11 or ZFR6F-11
MX-3BPR5ES-11 or BPR6ES-11
MX-6 & 626
2.0LBKR5E-11 or BKR6E-11
2.5LZFR5F-11 or ZFR6F-11
Navajo(1)
Protege DOHCBKR5E-11, BKR6E-11 or BKR7E-11
Protege SOHCBKR5E-11 or BKR6E-11
(2) RX7
LeadingBUR7E-QP
TrailingBUR9E-QP
323
CaliforniaBPR5ES-11 or BPR6ES-11
FederalBKR5E-11 or BKR6E-11
929BKR5EVX-11 or BKR6EVX-11
(1) Use Motorcraft spark plug number AWSF-42PP. (2) (Scheme 3)
(1)Use Motorcraft spark plug number AWSF-42PP.

SPARK PLUG TYPE

ApplicationGap: In. (mm)Torque: Ft. Lbs. (N.m)
B2200 (Carbureted).031 (.80)13 (18)
Navajo.054 (1.4)13 (18)
RX7(1) .044-.066 (1.1-1.7)13 (18)
All Others.041 (1.0)13 (18)
(1) Side gap type plug. Gap is not adjustable. (Scheme 3)
(1)Side gap type plug. Gap is not adjustable. (Scheme 3)

SPARK PLUG SPECIFICATIONS

Scheme 3

Scheme 3
Scheme 3

FIRING ORDER & TIMING MARKS

Note. RX7 firing order is 1-2. For timing marks (Scheme 11)

Firing Order & Distributor Rotation (B2200, B2600i & MPV 2.6L). Scheme 4

Scheme 4: Firing Order & Distributor Rotation (B2200, B2600i & MPV 2.6L)
Scheme 4: Firing Order & Distributor Rotation (B2200, B2600i & MPV 2.6L)

Firing Order (Miata). Scheme 5

Scheme 5: Firing Order (Miata)
Scheme 5: Firing Order (Miata)

Firing Order & Distributor Rotation (MPV 3.0L & 929). Scheme 6

Scheme 6: Firing Order & Distributor Rotation (MPV 3.0L & 929)
Scheme 6: Firing Order & Distributor Rotation (MPV 3.0L & 929)

Firing Order & Distributor Rotation (MX-3 1.6L, Protege & 323). Scheme 7

Scheme 7: Firing Order & Distributor Rotation (MX-3 1.6L, Protege & 323)
Scheme 7: Firing Order & Distributor Rotation (MX-3 1.6L, Protege & 323)

Firing Order & Distributor Rotation (MX-3 1.8L, MX-6 2.5L & 626 2.5L). Scheme 8

Scheme 8: Firing Order & Distributor Rotation (MX-3 1.8L, MX-6 2.5L & 626 2.5L)
Scheme 8: Firing Order & Distributor Rotation (MX-3 1.8L, MX-6 2.5L & 626 2.5L)

Firing Order & Distributor Rotation (MX-6 & 626 2.0L). Scheme 9

Scheme 9: Firing Order & Distributor Rotation (MX-6 & 626 2.0L)
Scheme 9: Firing Order & Distributor Rotation (MX-6 & 626 2.0L)

Firing Order & Coil Pack (Navajo). Scheme 10

Scheme 10: Firing Order & Coil Pack (Navajo)
Scheme 10: Firing Order & Coil Pack (Navajo)

IGNITION TIMING

ApplicationMan. Trans.(1) Auto. Trans.
B2200
Carbureted6 @ 8256 @ 825
PFI (2)6 @ 7506 @ 770
B2600i (2)5 @ 7505 @ 770
Miata (3)10 @ 8508 @ 850
MPV
2.6L (2)N/A5 @ 770
3.0L (2)N/A11 @ 800
MX-3
1.6L (3)10 @ 75010 @ 750
1.8L (3)10 @ 67010 @ 670
MX-6 & 626
2.0L (3)12 @ 70012 @ 700
2.5L (3)10 @ 65010 @ 650
Navajo(4)(4)
Protege
DOHC (3)10 @ 75010 @ 750
SOHC (3)5 @ 7505 @ 750
(5) RX7
Leading (3)(6) 5 @ 725(6) 5 @ 725
Trailing (3)(6) 20 @ 725(6) 20 @ 725
323 (3)7 @ 7507 @ 750
929 (3)N/A12 @ 700
(1) Place automatic transmission in Park. (2) Connect jumper wire between Green test connector and ground. (3) Connect jumper wire between terminals TEN and GRN of diagnostic connector. (4) Base (initial) timing is preset at 10 degrees BTDC and is not adjustable. To check timing, see appropriate ADJUSTMENTS article. (5) (Scheme 11) \ (6) Timing specification is AFTER TDC and is not adjustable.
(1)Place automatic transmission in Park.
(2)Connect jumper wire between Green test connector and ground.
(3)Connect jumper wire between terminals TEN and GRN of diagnostic connector.
(4)Base (initial) timing is preset at 10 degrees BTDC and is not adjustable. To check timing, see appropriate ADJUSTMENTS article.
(6)Timing specification is AFTER TDC and is not adjustable.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

Scheme 11

Scheme 11
Scheme 11

FUEL PUMP

Note. Fuel pump performance measures fuel pressure and volume availability, not regulated fuel pressure.

ApplicationPressure: psi (kg/cm 2 )Min. Vol. In 30 Sec.: Pts. (L)
B2200 (Carbureted)
Electric Pump2.8-3.6 (.20-.25)1.1 (.66)
Mechanical Pump3.7-4.7 (.26-.33).9 (.43)
Navajo(1).95 (.49)
MX-6 & 626 (2.5L)72-92 (5.5-6.5)(1)
All Others64-92 (4.5-6.5)(1)
(1) Information is not available from manufacturer.
(1)Information is not available from manufacturer.

FUEL PUMP PERFORMANCE

ApplicationAt Idle W/ Vacuum psi (kg/cm 2 )At Idle W/O Vacuum psi (kg/cm 2 )
B2200 (PFI) & B2600i28-37 (2.0-2.6)38-46 (2.7-3.2)
Miata, MX-6 & 62631-38 (2.2-2.7)38-46 (2.7-3.2)
MPV30-37 (2.1-2.6)38-46 (2.7-3.2)
MX-3, Protege & 32330-37 (2.1-2.6)38-46 (2.7-3.2)
RX727-32 (1.9-2.3)36-38 (2.5-2.7)
Navajo(1)(2)
92931-38 (2.2-2.7)38-46 (2.7-3.2)
(1) Pressure should be 30-45 psi (2.2-3.2 kg/cm 2 ) with engine running and 35-45 psi (2.5-3.2 kg/cm 2 ) with ignition on and engine off. (2) Information is not available from manufacturer.
(1)Pressure should be 30-45 psi (2.2-3.2 kg/cm 2 ) with engine running and 35-45 psi (2.5-3.2 kg/cm 2 ) with ignition on and engine off.
(2)Information is not available from manufacturer.

REGULATED FUEL PRESSURE

INJECTOR RESISTANCE

ApplicationOhms
Navajo13-16
Except Navajo12-16

INJECTOR RESISTANCE

IDLE SPEED & MIXTURE

ApplicationM/T RPM(1) A/T RPM
B2200
Carbureted825825
PFI (2)750770
B2600i (2)750770
Miata (3)850850
MPV
2.6L (2)750770
3.0L (2)800800
MX-3 (3)
1.6L750750
1.8L670670
MX-6 & 626 (3)
2.0L700700
2.5L650650
Navajo(4)(4)
Protege (3)750750
RX7 (3)725725
323 (3)750750
929 (3)N/A700
(1) Place automatic transmission in Park. (2) Connect jumper wire between Green test connector and ground. (3) Connect jumper wire between terminals TEN and GRN of diagnostic connector. (4) Idle speed is not adjustable, however, throttle angle (minimum air rate) can be set using special procedure. See ADJUSTMENTS article.
(1)Place automatic transmission in Park.
(2)Connect jumper wire between Green test connector and ground.
(3)Connect jumper wire between terminals TEN and GRN of diagnostic connector.
(4)Idle speed is not adjustable, however, throttle angle (minimum air rate) can be set using special procedure. See ADJUSTMENTS article.

IDLE SPEED SPECIFICATIONS

FAST (COLD) IDLE SPEED

ApplicationRPM
B2200 (Carbureted)(1) 3000-4000
RX7(2) Not Adjustable
(1) Adjust with throttle lever on highest step of fast idle cam. (2) See ADJUSTMENTS article for checking procedure.
(1)Adjust with throttle lever on highest step of fast idle cam.
(2)See ADJUSTMENTS article for checking procedure.

FAST (COLD) IDLE SPEED

THROTTLE POSITION (TP) SENSOR

Note. For information on connector terminal identification and test conditions specified in the following tables, see ADJUSTMENTS article.

Note. Throttle position sensor on MX-6 2.0L and 626 2.0L is not adjustable.

TP SENSOR VOLTAGE - B2200 PFI, B2600i & MPV 2.6L

Red Wire VoltsBlue Wire Volts (1)(2) Blue Wire Volts
4.50-4.59.37-.543.58-4.23
4.60-4.69.38-.553.66-4.32
4.70-4.79.39-.563.74-4.41
4.80-4.89.40-.573.82-4.51
4.90-4.99.40-.583.90-4.60
5.00-5.09.41-.603.97-4.70
5.10-5.19.42-.614.05-4.79
5.20-5.29.43-.624.13-4.88
5.30-5.39.44-.634.21-4.98
5.40-5.49.44-.644.29-5.07
5.50.44-.664.29-5.17
(1) Closed throttle. (2) Wide Open Throttle.
(1)Closed throttle.
(2)Wide Open Throttle.

TP SENSOR VOLTAGE - B2200 PFI, B2600i & MPV 2.6L

TP SENSOR CONTINUITY - MIATA, MX-3 1.6L, PROTEGE & 323 - A/T

Test Condition (1)(2) Continuity
.004" (.1 mm)Yes
.024" (.6 mm)No
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. (2) Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL.
(1)Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.
(2)Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL.

TP SENSOR CONTINUITY - MIATA, MX-3 1.6L, PROTEGE & 323 - A/T

TP SENSOR CONTINUITY - MIATA, MX-3 1.6L, PROTEGE & 323 - M/T

ConditionContinuity Between IDL & TL/EContinuity Between POW & TL/E
Miata
.016" (.4 mm) (1)YesNo
.027" (.7 mm) (1)NoNo
Wide Open ThrottleNoYes
MX-3, Protege & 323
.004" (.10 mm) (1)YesNo
.039" (1.0 mm) (1)NoNo
Wide Open ThrottleNoYes
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.
(1)Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.

TP SENSOR CONTINUITY - MIATA, MX-3 1.6L, PROTEGE & 323 - M/T

TP SENSOR CONTINUITY - MX-3 1.8L, MX-6 2.5L & 626 2.5L

Test Condition (1)(2) Continuity
.006" (.15 mm)Yes
.020" (.5 mm)No
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw. (2) Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL.
(1)Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.
(2)Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL.

TP SENSOR CONTINUITY - MX-3 1.8L, MX-6 2.5L & 626 2.5L

TP SENSOR RESISTANCE - MPV 3.0L & 929

Test ConditionOhms
MPV 3.0L
Between Terminals "A" & "D"3000-6000
Between Terminals "B" & "D"
Closed ThrottleAbout 1000 Or Less
Wide Open Throttle3000-6000
929
Between Terminals "A" & "D"3000-6000
Between Terminals "B" & "D"
Closed Throttle200-600
Wide Open Throttle3300-7000

TP SENSOR RESISTANCE - MPV 3.0L & 929

TP SENSOR RESISTANCE - NAVAJO

Test Condition (1)Ohms
Throttle Closed(2) 500-1200
(1) Check resistance between Gray/Red wire and Gray/White wire terminals. (2) TP sensor is not adjustable.
(1)Check resistance between Gray/Red wire and Gray/White wire terminals.
(2)TP sensor is not adjustable.

TP SENSOR RESISTANCE - NAVAJO

TP SENSOR VOLTAGE - RX7

Wire Color To GroundClosed Throttle VoltsWOT Volts
Green/Red (3F) (1).75-1.254.8-5.0
Black/Green (3G) (1)0.7-1.04.2-4.6
(1) PCM terminal pin No. in parentheses.
(1)PCM terminal pin No. in parentheses.

TP SENSOR VOLTAGE - RX7

THROTTLE (IDLE) SWITCH

RPMVolts
825 (Idle)About 12
1000-1200Less Than 1.5

THROTTLE (IDLE) SWITCH VOLTAGE - B2200 CARBURETED

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