Vehicles using M104.992 engine list:

Engine M104.992

Symptoms:
- Rough idling and misfires
- Loss of power and poor acceleration
- Engine warning light illumination
- Increased fuel consumption
- Hard starting or stalling

Diagnosis:
- Inspect ignition components such as spark plugs, ignition coils, and wires for wear or damage.
- Check for vacuum leaks around intake manifold and hoses.
- Perform compression test to assess cylinder health.
- Scan for fault codes related to fuel injection or ignition timing.
- Examine camshaft position sensor and crankshaft position sensor functionality.
- Inspect fuel injectors for clogging or leakage.

Fixes:
- Replace worn or fouled spark plugs and faulty ignition coils.
- Repair or replace cracked or leaking vacuum hoses.
- Clean or replace fuel injectors as needed.
- Replace faulty camshaft or crankshaft position sensors.
- Repair any wiring issues or sensor connectors.
- Perform routine timing belt replacement if due, as failure can cause severe engine damage.
- Clean or replace the idle control valve to stabilize idle speed.

Prevention:
- Follow recommended maintenance intervals for spark plugs, ignition components, and fuel system.
- Use high-quality fuel and keep fuel system clean with periodic injector cleaning.
- Regularly inspect vacuum lines and intake components for leaks.
- Replace timing belt and related components at specified mileage to avoid catastrophic failure.
- Keep engine sensors and wiring in good condition to ensure proper engine management.
- Maintain proper engine oil levels and change oil on schedule to protect engine internals.

By addressing these common issues proactively, owners of vehicles with the M104.992 engine can maintain reliable performance and avoid costly repairs.