What we found
The fuel-pressure sensor tested faulty, and the ECU connector's retaining lock was broken and fatigued. Inspection also found a broken rocker on cylinder 5 and approximately 1/4 inch of excess play at the intake rocker.
Camshaft lift measured outside specification
We measured the camshaft lobe lift and found it outside specification. Together with the broken rocker and excess intake-rocker play, this supported the lifter and camshaft diagnosis.
Recommended work, not a completed repair
We recommended considering camshaft and valvetrain work or engine replacement. The customer declined the recommended major engine repair, and we did not repair the vehicle. This story documents the diagnosis and recommendations; it does not report a resolved smoking concern or a successful post-repair road test.
What this case shows
Documenting the findings and explaining the options are important parts of diagnosis, even when the customer chooses not to proceed. The appropriate testing and repair plan depend on the individual vehicle and the findings.