Combustion and misfire diagnosis
A cylinder-specific misfire may come from ignition, injector delivery, air leaks, compression loss or valve timing. Identify which cylinders misfire and under what load or temperature. Inspect ignition and fuel trims, test coils and plugs where appropriate, and use compression or leak-down tests when the fault remains in the same cylinder. On direct-injection engines, carbon deposits and fuel pressure should be evaluated when symptoms support them. Do not replace all coils or injectors solely because of a misfire code.
Repair decisions and verification
Verify smooth operation at idle and under safe load, monitor misfire counters and confirm that catalyst-damaging misfires are no longer present.
High-output performance models can exhibit misfires, thermal warnings or intermittent power limitation.
How the problem should be evaluated
Record operating conditions, scan engine and transmission modules and evaluate ignition, fuel and cooling performance without assuming a major engine fault.
Why the model and engine matter: Specific AMG models may require specialized procedures and equipment.
If you are experiencing this issue, contact Mich’s Foreign Cars in Hickory, NC at 828-324-6012. Provide the model, year, engine, warning text and when the symptoms occur so our service team can discuss an appropriate diagnostic visit.