Me and my dad are trying to sort out an issue on my sisters 2009 Aveo 1.2L
The engine warning light came on and we scanned the OBD and it said that there was a cylinder 3 misfire.
We have worked through the usual things:
Replaced the Spark plugs
Replaced the Spark Plug leads
Replaced the Coil pack
Ran compression Test on all cylinders (and all are good)
Measured the resistance on all of the Injectors and they all show the same (12 ohms)
So all OK so far
We then measured the Voltage being supplied to the injectors and Cylinders 1,2&4 are getting in the region of 7V but Cylinder 3 is getting between 2&3 Volts
So my question is - is injector 3 faulty and the on Board ECU is just supplying less voltage as a result of it being faulty, or is it the ECU that is likely to be faulty.
We have re-seated all of the multi plugs on the engine (having sprayed with switch cleaner).
It would appear that Cylinder 3 is over fueling as the MPG has gone through the floor, the Spark Plug is wet when initially taken out (and quickly dries) showing that its petrol on the plug not oil.
On a couple of occasions when we were metering the Injectors we did get the error P0267 Cylinder 3 Injector Circuit Low.
Any help on this would be greatly appreciated