Can you have a misfire with no check engine light?
YES there is a way to find these misfires! Often called “phantom” misfires. It’s possible to find a misfire in your Ford, even if there is no check engine light. All you need is an OBDII scanner with Mode 6 function.
How do I know if I have a misfire?
Symptoms Of A Misfire
- Rough Idling. Engines that idle in a clunky or rough manner could be suffering from misfiring.
- Sluggish Acceleration. Your car might have trouble reaching adequate speeds if your engine is misfiring.
- Engine Sound Changes.
- Black Exhaust.
- Your “Check Engine” Light Might Illuminate.
Will a bad spark plug always throw a code?
Bad spark plugs can cause your engine to misfire. The engine’s computer uses sensors to detect these misfires and will create a code that turns on the check engine light. A flashing check engine light indicates the misfire is severe enough to cause damage to your catalytic converter.
Will a bad fuel injector cause a misfire code?
One of the obvious symptoms of a clogged fuel injector is the lighting up of the “Check Engine” light in your dashboard. The fault codes usually associated with a clogged fuel injector can range from misfire codes to lean codes.
What does a misfire code on a check engine light mean?
Misfires that turn on the check engine light and log a cylinder-specific fault code are the easiest to diagnose. The OBD II system will identify the cylinder (s) that are not contributing their normal dose of power and set a code that corresponds to the firing order. A P0303 code, for example, would tell you that the No. 3 cylinder is misfiring.
What does it mean when a cylinder is misfired?
If your scan tool’s misfire history indicates multiple cylinder misfires, focus on the cylinder with the most misfire counts. The misfire counts on adjacent cylinders are often “sympathetic” misfires that will often disappear when the primary misfire is repaired.
What causes a car engine to misfire intermittently?
On rare occasion, a sticking exhaust valve caused by insufficient valve stem oil clearances or a weak valve spring can also cause a very intermittent loss of compression and cylinder misfire. Obviously, over-advanced ignition timing can cause cylinder misfires.
Is it possible to find a misfire in a Ford?
It’s possible to find a misfire in your Ford, even if there is no check engine light. All you need is an OBDII scanner with Mode 6 function. It is a common situation. You’re driving your F150, F250, E150 van, or Expedition, etc and you can feel the engine skipping here and there.