The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Dodge Challenger R/T Scat Pack - Rough Idle and Misfire

0

Dan C. · rep 0 · May 22, 5:41 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Challenger R/T Scat Pack

Hey everyone,

I'm having some trouble with my 2018 Dodge Challenger R/T Scat Pack. 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.

The check engine light came on a couple of days ago, and I noticed a slight hesitation and a bit of power loss when accelerating. It's not terrible, but definitely noticeable compared to how it usually runs.

Has anyone experienced something similar with their Challenger? I'm trying to figure out if this is a common issue or something more serious. Any advice on what to check first would be greatly appreciated before I take it into the shop.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:41 AM

0

ClearTheCode admin answer:

It sounds like your 2018 Dodge Challenger R/T Scat Pack is experiencing a misfire, which is a common issue that can cause rough idling and power loss. The Check Engine Light (CEL) confirms an issue has been detected by the vehicle's onboard diagnostics system.

Common Causes for Misfires (OBD-II Code P030x):

When your CEL illuminates due to a misfire, you'll likely have a P030x code, where 'x' indicates the cylinder number (e.g., P0301 for cylinder 1, P0302 for cylinder 2, etc.). A P0300 indicates a random/multiple cylinder misfire.

  1. Ignition System Issues:

    • Worn Spark Plugs: Over time, spark plugs degrade, leading to weak or inconsistent spark.
    • Faulty Ignition Coils: A failing ignition coil can prevent a cylinder from firing correctly.
    • Damaged Spark Plug Wires: Less common on newer vehicles, but still a possibility.

  2. Fuel System Issues:

    • Clogged Fuel Injectors: An injector that isn't delivering enough fuel can cause a lean misfire.
    • Low Fuel Pressure: A failing fuel pump or clogged fuel filter can starve the engine of fuel.

  3. Air/Vacuum Leaks:

    • Vacuum Leaks: Unmetered air entering the engine can disrupt the air-fuel ratio, leading to misfires.
    • Dirty Mass Airflow Sensor (MAF): An inaccurate MAF reading can cause incorrect fuel delivery.

  4. Engine Mechanical Issues:

    • Low Compression: Worn piston rings, valves, or a blown head gasket can reduce compression in a cylinder, preventing proper combustion. This is less common but more serious.

When to See a Shop:

Given that your vehicle is a high-performance R/T Scat Pack, it's highly recommended to have a professional diagnose this issue promptly. Continuing to drive with a significant misfire can potentially lead to further damage, especially to the catalytic converter due to unburnt fuel entering the exhaust system.

What a Shop Will Do:

  1. Scan for Codes: They will use an OBD-II scanner to retrieve specific diagnostic trouble codes (DTCs) to pinpoint the misfiring cylinder(s).
  2. Inspect Ignition Components: Check spark plugs, ignition coils, and related wiring.
  3. Test Fuel System: Verify fuel pressure and potentially test fuel injector operation.
  4. Check for Vacuum Leaks: Use smoke tests or other methods to find leaks.
  5. Perform Compression Test: If other diagnostics don't reveal the cause, a compression test will check the mechanical integrity of the engine.
Menu

Help & account