What causes engine misfire on startup?
An engine misfires. Engine misfires can be caused by a list of faults, but there are a few suspects that occur more than others. The primary villains are simple – spark or fuel – usually manifesting in spark plugs, plug wires, the coil(s) or the fuel-delivery system.
What can cause a misfire on 1 cylinder?
Lean misfire causes that only affect one cylinder include a dirty fuel injector, an open or shorted fuel injector, or a problem in the fuel injector driver circuit (wiring or PCM). Compression problems that may cause a misfire include a burned exhaust valve, bent intake or exhaust valve, or leaky head gasket.
Can low engine oil cause a misfire?
You can’t drive a misfiring engine very long without causing additional damage. If the low oil pressure warning light came on, too, there could be a connection simply because running the engine too low on oil will cause mechanical damage and thence malfunctions of all kinds.
What is the misfire code on my Subaru Forester?
P0301 should be considered a cause for concern, and can be a threat to the drivability your Forester. The one nice thing about P0301 is that it is a cylinder specific misfire code. This makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring. It will often be accompanied by codes P0302-P0308.
What to do when a cylinder misfire occurs?
If the Engine System has a Misfire Counter for specific cylinders on the Scan Tool Data Stream, pay very close attention to the cylinders (s) named in the misfire code (s). If there is not a Cylinder Misfire Counter, then you might have to switch components—such as coils, spark plugs, etc.—in order to isolate the root cause of the misfire.
Where is the first cylinder on a Subaru Forester?
An important thing to understand when finding the location of cylinder one is that it’s going to be the first cylinder in the firing order of the vehicle, and not the first cylinder that you might see when looking at the engine. The P0301 Subaru trouble code will trigger the Forester’s service engine soon light.
What does p0301 stand for in Subaru Forester?
P0301 is a common OBDII trouble code that appears in the Subaru Forester. It stands for: P0301 should be considered a cause for concern, and can be a threat to the drivability your Forester. The one nice thing about P0301 is that it is a cylinder specific misfire code.