I’m trying to solve a problem with a misfire on cylinder 2 in my 2001 Schumacher MPI Sei. I collected some information today using various tests alongside Fiat ECU Scan to fire injectors/coil banks.
Symptoms:
Cylinder 2 view down the sparkplug hole........................................and.....................cylinder 1 for comparison
Other information -
Tests to be carried out in order of labour-intensity –
Question before proceeding -
Is it possible that a dysfunctional injector could cause oil in the cylinder as a result of there being no firing? i.e. could a cylinder which has been idling for an unknown amount of time be pulling oil from somewhere?
As always, any assistance or guidance would be much appreciated!
Symptoms:
- Obvious misfire, car is running on 3 cylinders, does not clear with revs.
- Cyl 2 injector actuation sound is substantially quieter/weaker than 1, 2 & 4 - barely audible in fact. This makes me think there is zero fuel being delivered.
- Spark plug on cyl 2 has fresh oil fouling, even after repeated cleans.
- After cleaning, plug has been verified operating/swapped with adjacent cylinder.
- Spark is present on plug when tested out of engine using Fiat ECU Scan to fire coil banks.
- Using a borescope to get a better view down cyl 2, oil is evident in cylinder and around piston crown, along with a fair bit of carbon/garbage. Cylinder 1 shows some liquid present also, but could be fuel from repeated injector tests.
- Slightly sooty plugs 1, 3 & 4. ECU enrichment compensation for non-firing on cyl 2
Cylinder 2 view down the sparkplug hole........................................and.....................cylinder 1 for comparison
Other information -
- The car came like this, it is not a problem which has developed during my ownership.
- No coolant being used, no exhaust gas smell in coolant, no coolant in oil.
Tests to be carried out in order of labour-intensity –
- Compression test may rule out or indeed suggest oil control rings.
- Removal and inspection/cleaning of injector may reveal something.
- Pulling the cam cover, cam & replace valve stem oil seals in the event the oil is originating there.
Question before proceeding -
Is it possible that a dysfunctional injector could cause oil in the cylinder as a result of there being no firing? i.e. could a cylinder which has been idling for an unknown amount of time be pulling oil from somewhere?
As always, any assistance or guidance would be much appreciated!