The most important thing you've got to make sure of before you figure this out is going to be the trouble code number. Are you sure based on the check engine light flashes that trouble code number 4 is present? If so... Code 4 on the older Honda Civic indicate a problem with the engine crankshaft position sensor. Normally if this sensor is defective it will not allow your Honda to start. Rarely is the sensor defective, and it cause engine hesitation. It's not impossible, but it's usually the camshaft sensor which is intermittently failing which causes a low power issue. We recommend checking the trouble code number again. We've posted the list and trouble code retrieval process for 1990 through 1995 Honda Civics below.
You can retrieve your Honda Civic's trouble code(s) yourself by using inserting a jumper wire at the diagnostic connector located in the passenger side kick panel. Insert the jumper wire in the 2 PIN service connector between pins 1 and 2. You should also see a 3 PIN connecter. This is used for a trouble code scanner. Trouble codes will be stored in the ECU even if the check engine light is not on.
Once the jumper is inserted, turn on the ignition key. The trouble code(s) will begin flashing using the check engine light indicator. Begining counting the flashes. Use Trouble Code 23 as a guide. Example: 2 long flashes followed by 3 short flashes = Trouble Code 23. If more than one trouble code exists there will be a long pause in between the codes.
Honda Civic OBD I Trouble Codes:
Code 0 and 11 Electronic Control Module (ECM)
Code1 Heated oxygen sensor A
Code 2 Oxygen content B
Code 3 and 5 Manifold Absolute Pressure
Code 4 Crank position sensor
Code 6 Engine coolant temperature
Code 7 Throttle position sensor
Code 8 Top dead center sensor
Code 9 No.1 cylinder position sensor
Code 10 Intake air temperature sensor
Code 12 Exhaust recirculation system
Code 13 Barometric pressure sensor
Code 14 Idle air control valve or bad ECM
Code 15 Ignition output signal
Code 16 Fuel Injector
Code 17 Vehicle speed sensor
Code 19 A/T lock-up control solenoid
Code 20 Electric load detector
Code 21 V-TEC control solenoid
Code 22 V-TEC pressure solenoid
Code 23 Knock sensor
Code 30 A/T FI signal A
Code 30 A/T FI signal B
Code 41 Heated oxygen sensor heater
Code 43 Fuel supply system
Code 45 Fuel supply metering
Code 48 Heated oxygen sensor
Code 61 Front heated oxygen sensor
Code 63 Rear heated oxygen sensor
Code 65 Rear heated oxygen sensor heater
Code 67 Catalytic converter system
Code 70 Automatic transaxle
Code 71 Misfire detected cylinder 1
Code 72 Misfire detected cylinder 2
Code 73 Misfire detected cylinder 3
Code 74 Misfire detected cylinder 4
Code 75 Misfire detected cylinder 5
Code 76 Misfire detected cylinder 6
Code 80 Exhaust recirculation system
Code 86 Coolant temperature
Code 92 Evaporative emission control system
