What can cause a P0304 code?
A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. Many times, P0304 occurs when there are worn out spark plugs, spark plug wires, or a faulty ignition coil.
What may cause misfires on cylinder 4 on 5.3 engine?
A faulty worn spark plug. A failed coil pack or coil-on-plug coil. A bad spark plug wire on a vehicle that has plug wires.
What does the p0304 code on a Subaru mean?
The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests needs to be done to diagnose problem, see “Possible Causes” What is the cost to diagnose the P0304 SUBARU code
What is the misfire code on a Subaru Forester?
The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Forester has P0304 as well. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code.
What does a cylinder 4 misfire code mean?
P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. An important thing to understand when finding the location of Cylinder 4 is that it’s going to be the 4’th cylinder in the firing order of the vehicle, and not the 4’th cylinder that you might see when looking at the engine.
What happens if you leave the p0304 unfixed?
P0304 is cause for concern and left unfixed can leave you stranded or make the vehicle virtually un-drivable. Fixing the problem causing the code to fire can save you time and money and keep your Subaru Forester from breaking down. Quick action may also save your catalytic converter from going bad.