Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Misfire Definition:
A misfiring cylinder is lacking power relative to the other cylinders. The causes for a cylinder specific misfire could be fuel, spark, or mechanical
problems.
Perform a thorough visual inspection. If no visible concerns are found use the following WDS tools for misfire diagnosis:
^
Self-test (Check for codes first)
Power Balance (Identify the cylinder of concern)
^
Relative Compression (Rule out a possible mechanical issue)
^
Fuel (Make sure fuel injectors are not restricted)
^
Ignition (Make sure spark plugs and coils are working properly)
^
Oscilloscope (Detailed signal analysis)
NOTE
USE THE ENCYCLOPEDIA BUTTON IN THE LOWER LEFT CORNER OF THE SCREEN FOR DETAILED INFORMATION ON THE WDS
TOOL BEING DISPLAYED.
If there is a self-test code identifying a particular cylinder then you just need to determine if it is a fuel, ignition, or possibly a mechanical problem.
Proceed to Step 2 after running Relative Compression to rule out any mechanical issues. If there is no self-test code and the customer concern is a
miss, proceed to Step 1.
Step 1: (Select Toolbox Icon, then Powertrain, then Power Balance)
