Vehicles using M104.944 engine list:

Engine M104.944

Symptoms:
- Rough idling and misfires
- Loss of power and poor acceleration
- Engine warning lights (check engine light)
- Increased oil consumption or leaks
- Hard starting or stalling

Diagnosis:
- Inspect ignition components such as spark plugs, ignition coils, and wires for wear or damage.
- Perform a compression test to check for cylinder sealing issues.
- Check for vacuum leaks around intake manifold and hoses.
- Scan for fault codes using an OBD-I compatible scanner to identify sensor or system faults.
- Inspect the camshaft position sensor and crankshaft position sensor for proper operation.
- Examine the timing chain and tensioner for wear or slack.
- Check for oil leaks around valve cover gaskets and oil seals.

Fixes:
- Replace worn or fouled spark plugs and faulty ignition coils.
- Repair or replace damaged vacuum hoses to eliminate leaks.
- Replace faulty sensors such as camshaft or crankshaft position sensors.
- Adjust or replace the timing chain and tensioner if slack or wear is detected.
- Replace valve cover gaskets and oil seals to stop oil leaks.
- Clean or replace the idle control valve to stabilize idle.
- Perform routine oil changes with manufacturer-recommended oil to maintain engine health.

Prevention:
- Follow regular maintenance schedules including timely oil and filter changes.
- Use high-quality spark plugs and ignition components.
- Periodically inspect and replace vacuum hoses before they crack or leak.
- Monitor engine performance and address warning lights promptly.
- Avoid prolonged idling and aggressive driving to reduce engine stress.
- Keep the cooling system in good condition to prevent overheating.
- Use recommended fuel grade to ensure proper combustion and engine longevity.