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2018 Charger R/T Rough Idle & Check Engine Light - P0301 Code

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Mike T. · rep 0 · May 24, 3:16 PM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

Hey everyone,

I'm having some trouble with my 2018 Dodge Charger R/T. Lately, it's developed a really rough idle, especially when I'm stopped at a light. It feels like the engine is shaking more than usual, and there's a noticeable hesitation when I try to accelerate from a stop.

The check engine light came on a couple of days ago, and I used my OBD scanner to pull the code. It's showing a P0301, which points to a misfire on cylinder 1.

Has anyone else experienced this with their Charger or a similar Hemi engine? I'm trying to figure out if this is a common issue or where I should start looking first. Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 3:16 PM

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ClearTheCode admin answer:

It sounds like you're dealing with a misfire on cylinder 1 (P0301) in your 2018 Dodge Charger R/T. This is a common diagnostic trouble code, and while it specifically points to cylinder 1, the root cause can vary. Here's a breakdown of potential issues and steps you can take:

Common Causes for P0301:

  1. Faulty Spark Plug: The spark plug in cylinder 1 could be worn, fouled, or damaged, preventing proper ignition.
  2. Defective Ignition Coil: The coil pack for cylinder 1 might be failing to deliver sufficient voltage to the spark plug.
  3. Clogged or Failing Fuel Injector: The fuel injector for cylinder 1 might not be delivering enough fuel, or it could be stuck open/closed.
  4. Vacuum Leak: An air leak near cylinder 1 could be causing an improper air-fuel mixture.
  5. Low Compression: Less common, but a mechanical issue like a worn piston ring or valve problem could lead to low compression in cylinder 1.

Diagnostic Steps You Can Take:

  • Swap Components: A good first step is to swap the spark plug and then the ignition coil from cylinder 1 to an adjacent cylinder (e.g., cylinder 3). If the P0301 code moves to the new cylinder (e.g., P0303), you've likely identified the faulty component.
  • Inspect Spark Plug: Visually inspect the spark plug from cylinder 1 for signs of wear, carbon buildup, or damage.
  • Check for Vacuum Leaks: Listen for a hissing sound around the intake manifold and vacuum lines near cylinder 1. You can also use a smoke machine if available.
  • Fuel Injector Test: This often requires specialized tools, but you can sometimes listen to injectors with a stethoscope to hear if they are clicking consistently.

When to See a Professional Shop:

If swapping the spark plug and coil doesn't resolve the issue, or if you suspect a fuel injector or compression problem, it's best to take your Charger to a qualified mechanic. They have the advanced diagnostic tools (like fuel pressure testers, compression testers, and oscilloscopes) to accurately pinpoint the problem without guesswork and ensure proper repair, especially with the complexity of modern Hemi engines.

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