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2018 Charger Scat Pack Misfire & P030X Codes - Rough Idle

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Mike T. · rep 0 · May 22, 5:39 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T Scat Pack

Hey everyone,

I've got a problem with my 2018 Dodge Charger R/T Scat Pack that just popped up. Yesterday, while driving, the check engine light started flashing, and the car developed a really rough idle. It feels like it's struggling, especially when I'm stopped at a light.

I pulled over and used my OBD-II scanner. It's showing multiple misfire codes: P0301 (Cylinder 1 Misfire Detected) and P0300 (Random/Multiple Cylinder Misfire Detected). I cleared them, but they came right back.

Has anyone experienced this with their Scat Pack? What are the most common culprits for misfires on these Hemi engines? I'm hoping it's something relatively simple I can tackle myself before taking it to a shop. Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:39 AM

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Hello John,

Experiencing misfire codes like P0300 and P0301 on your 2018 Dodge Charger R/T Scat Pack can be concerning, but it's a common diagnostic issue. Here's a breakdown of potential causes and steps you can take:

Common Causes for Misfires (P0300/P030X):

  1. Ignition System Issues:

    • Worn Spark Plugs: Over time, spark plugs degrade, leading to weak or inconsistent spark. Given your car's age, this is a strong possibility, especially if they haven't been replaced recently.
    • Faulty Ignition Coils: Each cylinder has its own ignition coil. A failing coil pack for cylinder 1 (P0301) or multiple coils (P0300) will prevent proper ignition.
    • Damaged Spark Plug Wires: Less common on modern engines with coil-on-plug, but still possible.

  2. Fuel System Issues:

    • Clogged Fuel Injector: A dirty or failing fuel injector for cylinder 1 won't deliver enough fuel, causing a lean misfire.
    • Low Fuel Pressure: A failing fuel pump or clogged fuel filter could lead to insufficient fuel delivery to all cylinders.

  3. Air/Vacuum Leaks:

    • Vacuum Leaks: Unmetered air entering the engine can disrupt the air-fuel ratio, causing misfires. Check for cracked hoses or loose connections around the intake manifold.
    • PCV Valve Issues: A stuck open PCV valve can also cause a vacuum leak.

  4. Engine Mechanical Issues (Less Common but Serious):

    • Low Compression: Worn piston rings, damaged valves, or a blown head gasket can lead to a loss of compression in a cylinder, preventing proper combustion.

Diagnostic Steps You Can Take:

  1. Check Spark Plugs and Coils: Start by inspecting the spark plug and ignition coil for cylinder 1. Look for signs of wear, oil fouling, or damage. You can try swapping the coil from cylinder 1 to another cylinder (e.g., cylinder 3) and see if the misfire code follows the coil. If P0303 appears, you've found your faulty coil.
  2. Inspect Fuel Injectors: While more involved, a mechanic can test fuel injector pulse and spray pattern. You can also try adding a high-quality fuel system cleaner to your tank.
  3. Visual Inspection for Leaks: Carefully inspect all vacuum lines and the intake manifold for any visible cracks or loose connections.

When to See a Shop:

  • Persistent Flashing Check Engine Light: A flashing CEL indicates a severe misfire that could damage your catalytic converter. Driving with a flashing CEL should be avoided.
  • No Obvious DIY Fixes: If replacing spark plugs or swapping coils doesn't resolve the issue, or if you suspect fuel system or mechanical problems, it's best to consult a qualified technician. They have specialized tools for compression tests, fuel pressure tests, and advanced diagnostics to pinpoint the exact cause safely and efficiently.
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