Vehicles using 40-x engine list:

Engine 40-x

Symptoms:
- Rough idling and stalling, especially when cold
- Reduced power and sluggish acceleration
- Increased fuel consumption
- Occasional misfires or hesitation during acceleration
- Engine warning light illumination

Diagnosis:
- Check for vacuum leaks around intake manifold and hoses
- Inspect ignition components: spark plugs, wires, distributor cap, and rotor for wear or damage
- Test fuel delivery system including fuel filter and fuel pump pressure
- Examine the idle control valve and throttle body for carbon buildup
- Scan for any stored fault codes using an OBD scanner compatible with older systems

Fixes:
- Replace worn or fouled spark plugs and ignition wires
- Repair or replace cracked or leaking vacuum hoses
- Clean or replace the idle control valve and throttle body to restore smooth idling
- Change fuel filter and ensure fuel pump is delivering correct pressure
- Adjust or replace the distributor cap and rotor if corrosion or wear is present
- Perform a thorough tune-up including timing and carburetor adjustments if applicable

Prevention:
- Regularly replace spark plugs and ignition components as per manufacturer’s schedule
- Use quality fuel and change fuel filter at recommended intervals to prevent clogging
- Periodically inspect and replace vacuum hoses to avoid leaks
- Keep the throttle body and idle control valve clean to maintain proper airflow
- Follow routine maintenance schedules including oil changes and timing checks to ensure engine longevity

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