battlecrxT

iTrader: (1)

I have a 91 crx hx and my problem is, its only running on 2 and 3, but fires on all 4. 1 and 4 is getting fuel/fire but when I pull the sparkplug wire engine idle doesn't change. So I pulled the plug and checked the gap and its good. But when I disconnect the inj it throws code 16 (Fuel Injector System defective circuit or unplugged / defective fuel injector) cleared that by plugging the plug back up and code 12(defective circuit or unplugged / defective sensor) is there too. Now once all the codes are clear will the problem clear or remain the same? S.O.S. Thanx in advance

Je2RiT

You sure you dont have the plugs switched?...
12 is EGR Lift Sensor...
- vacuum leak or poor electrical connection can cause a fault code.

- First check that all vacuum lines and electrical connections are in good condition.
If the engine will not run at idle, disconnect the vacuum hose to the EGR valve and plug it.
If the engine will now idle, the problem is in the EGR control system.


- Check the wiring for the control solenoid (pic below).
One wire should have 12 volts any time the engine is running.
The ground wire goes to the ECU.
Turn the ignition switch OFF and use an ohmmeter to see if the wire between the ECU and
control solenoid is shorted to ground.
If the wiring is correct, the ECU is getting an incorrect input signal or the ECU is faulty.




- To test the EGR valve lift sensor, turn the ignition OFF and disconnect the wiring to the
EGR valve.
Turn the ignition switch ON and check for 5 volts to the sensor at one of the connector terminals.
Switch the ignition OFF, connect an ohmmeter across the center and either of the end
terminals on the EGR valve lift sensor connector and operate the EGR valve with the
vacuum pump.
The resistance should change as the valve opens and closes.

Hope this helps!!!!!