It appears the little burble in the idle and whatnot are signs of a misfire, the fuel pump was on it's way out and replacing it seems to have shined the light on the real problem.
Through diagnosis it appears cylinder 3 and 6 spark plugs are pretty sooty, all the others look normal. I replaced them all maybe 6 months ago.
Next was to check the injectors:
Brought motor to operating temperature. Measurements taken in ohms:
Cylinder 1: 13.2
Cylinder 2: 13.3
Cylinder 3: 13.3
Cylinder 4: 13.1
Cylinder 5: 13.4
Cylinder 6: 13.4
These are all within spec for operating resistance on injectors for the 4.0L, the Range being 10-13.5 IIRC. I did however swap injector 6 with injector 5 and the Code 27 moved with it, making it a misfire on 3,5,& 6.
I guess that means it's time to replace a couple injectors, however the hard start is still a problem and it's making me think the PCM might be on the way out.
Through diagnosis it appears cylinder 3 and 6 spark plugs are pretty sooty, all the others look normal. I replaced them all maybe 6 months ago.
Next was to check the injectors:
Brought motor to operating temperature. Measurements taken in ohms:
Cylinder 1: 13.2
Cylinder 2: 13.3
Cylinder 3: 13.3
Cylinder 4: 13.1
Cylinder 5: 13.4
Cylinder 6: 13.4
These are all within spec for operating resistance on injectors for the 4.0L, the Range being 10-13.5 IIRC. I did however swap injector 6 with injector 5 and the Code 27 moved with it, making it a misfire on 3,5,& 6.
I guess that means it's time to replace a couple injectors, however the hard start is still a problem and it's making me think the PCM might be on the way out.