Part one of Diagnosing spark plug foul. I changed the plugs out and still have an intermittent miss while cruising at low RPM when I hit the gas. Si here I am trying to fix the problem and giving some helpful hints along the way.
No code misfire
So you have a car with a clear misfire but there are no codes. Don't
worry, you can still use your scanner & labscope to quickly and accurately
identify the problem and fix it with confidence without throwing parts at
Finding an intermittent
Finding an intermittent problem is probably the most frustrating thing we
do. And because of that, it's also probably the problem that get's the
most parts "thrown" at it. Remember this. The intermittent problem does
have a cause. All we have to do is stop guessing and look for evidence.
Follow the evidence and it will lead you to the problem.
Ford F150 - Coil on Plug Replacement 1998-2014 5.4L
Do you have a late model Ford: Mustang, f-150, explorer, expedition,
etc? Is your engine light on and the code says you have a cylinder
misfire? Chances are good that you have a bad coil. This is a quick video
that shows how to diagnose with an odbII reader and fix the problem. It's
about an hour long fix to do the tough cylinders: 3,4, 7 & 8. It takes
about 20 minutes to do the others.
Cylinder Misfires & Ignition Coil Testing
MotorWeek's Pat Goss shows what to check first when a cylinder misfire code
shows up on an OBD scan tool. This includes how to test modern coil on plug
ignition coils with a spark tester (available under "Extras" at
Ford Expedition Spark Plug Replacement Part 1
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Ford Triton 5.4 Liter 3 Valve - Broken Spark Plug Extraction With Lisle Tool
In this video, I will show how to extract the broken spark plug from the
Ford F-150 Triton 5.4 liter 3 valve engine. This video will show how to use
the Lisle Spark plug extraction tool.
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