Vehicles using M113.944 engine list:

Engine M113.944

Symptoms:
- Rough idling and misfires
- Loss of power or hesitation during acceleration
- Oil leaks around valve covers or intake manifold
- Check Engine Light (CEL) illumination
- Excessive oil consumption

Diagnosis:
- Inspect ignition coils and spark plugs for wear or damage, as misfires are common with aging components.
- Check for vacuum leaks around intake manifold gaskets, which can cause rough idling.
- Examine valve cover gaskets and intake manifold gaskets for oil leaks.
- Perform a compression test to assess cylinder health.
- Scan for stored fault codes related to ignition, fuel delivery, or sensors.

Fixes:
- Replace worn or faulty ignition coils and spark plugs to restore smooth engine operation.
- Replace valve cover and intake manifold gaskets to stop oil leaks.
- Clean or replace the Mass Air Flow (MAF) sensor if dirty or malfunctioning.
- Repair any vacuum leaks by replacing cracked hoses or gaskets.
- Change engine oil and filter regularly to prevent sludge buildup and maintain lubrication.
- If compression is low, further engine inspection or rebuild may be necessary.

Prevention:
- Follow the manufacturer’s recommended maintenance schedule, especially for spark plugs and ignition components.
- Use high-quality engine oil and change it at recommended intervals to avoid sludge and wear.
- Regularly inspect and replace aging gaskets and seals to prevent leaks.
- Avoid prolonged idling and aggressive driving to reduce engine stress.
- Keep the air intake system clean and free of debris to ensure proper airflow.

By addressing these common issues proactively, owners of vehicles with the M113.944 engine can maintain reliable performance and extend engine life.