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2018
ram 150024 views

Rough Idle or Engine Misfire

Expert diagnosis and repair solutions for 2018 ram 1500 Rough Idle or Engine Misfire. Get step-by-step fixes, cost estimates, and professional advice.

Expert Repair Solutions

1
medium$150-$300
Replace faulty spark plugs and ignition coils to resolve misfire issues.
Source: https://repairpal.com/ram/1500/2018/rough-idle

Repair Steps:

  1. Identify the misfiring cylinder using a diagnostic tool.
  2. Remove the faulty spark plug and ignition coil.
  3. Install new spark plug and ignition coil.
  4. Test the engine to ensure the misfire is resolved.
2
medium$100-$200
Inspect and repair any vacuum leaks in the engine to address rough idle.
Source: https://5thgenrams.com/community/threads/engine-troubles-rough-idle.33412/

Repair Steps:

  1. Use a smoke machine to detect vacuum leaks.
  2. Identify the source of the leak, such as hoses or gaskets.
  3. Replace or repair the leaking component.
  4. Re-test for leaks and ensure the idle is smooth.
3
easyFree if covered under warranty or recall
Update the Powertrain Control Module (PCM) software to fix misfire and rough idle issues.
Source: https://static.nhtsa.gov/odi/tsbs/2020/MC-10187710-9999.pdf

Repair Steps:

  1. Visit a dealership to have the PCM software updated.
  2. Ensure the update addresses the specific Diagnostic Trouble Codes (DTCs) related to misfire.
  3. Test drive the vehicle to confirm the issue is resolved.
4
hard$300-$600
Replace the Exhaust Gas Recirculation (EGR) valve to prevent misfire and rough idle.
Source: https://static.nhtsa.gov/odi/tsbs/2025/MC-11013168-0001.pdf

Repair Steps:

  1. Remove the old EGR valve and inspect for damage.
  2. Install a new EGR valve and ensure proper sealing.
  3. Clear any related DTCs from the vehicle's computer.
  4. Test the engine for improved performance and idle.
5
hardFree if covered under recall
Replace the high-pressure fuel pump (HPFP) to resolve fuel starvation issues.
Source: https://static.nhtsa.gov/odi/rcl/2022/RCLRPT-22V406-4484.PDF

Repair Steps:

  1. Contact a dealership to confirm recall eligibility.
  2. Have the HPFP replaced by certified technicians.
  3. Inspect and replace additional fuel system components if necessary.
  4. Test the vehicle to ensure proper fuel delivery and engine performance.

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