Tracking files:
13. Removed spark plugs and visually inspected. Found the electrode insulator of cylinder 7 darker than all other spark plugs indicating the cylinder that may be running richer. There was also a minor tracking mark on the insulator. Tested spark plug function in bench tester and it is still functioning correctly.
14. Measured spark plug gaps and found they are all within the 0.6-0.7mm spec.
Cylinder wall
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Cylinder 5
Cylinder 6
Cylinder 7
Cylinder 8
15. Using a borescope through the spark plug well, inspected and found no major visual discrepancies between individual cylinders.
16. Carried out compression testing of all cylinders. Repeated test for cylinder 4 which had the lowest reading and cylinder 6 which had the highest reading and found similar readings in second tests. Values are fairly consistent and unlikely to be the cause of the reported fault symptoms.
17. Carried out cylinder leakage test of cylinder 4 and observed approx. 12-15% leakage which is in the allowable range.
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