How to change oil control valve on 2003 Hyundai Elantra

The P1140 code in a Hyundai refers to the Intake Valve Timing Control Solenoid Valve. This valve is part of the Variable Valve Timing (VVT) system and is responsible for controlling the timing of the intake valves to optimize engine performance.
If you've already replaced the Mass Air Flow (MAF) sensor and the issue persists, here are some additional steps you can take to address the P1140 code:
1. **Inspect the Intake Valve Timing Control Solenoid Valve:**
Check the wiring and connectors associated with the Intake Valve Timing Control Solenoid Valve. Ensure there are no loose or damaged connections. If the wiring appears damaged or there's a poor connection, repair or replace as needed.
2. **Check Oil Levels and Quality:**
The VVT system relies on proper oil flow and pressure. Ensure that the engine oil level is correct and that you are using the recommended oil viscosity. Dirty or low-quality oil can affect the proper functioning of the system.
3. **Test the Intake Valve Timing Control Solenoid Valve:**
You may need to test the solenoid valve to ensure it is functioning correctly. This involves using a multimeter to measure resistance and checking for proper operation. Refer to the vehicle's service manual for specific testing procedures.
4. **Verify Timing Chain/Belt:**
Issues with the timing chain or belt can affect the VVT system. Check the condition and tension of the timing chain or belt. If it's worn, stretched, or damaged, it may need replacement.
5. **Scan for Additional Codes:**
Perform a comprehensive OBD-II scan to check for any additional trouble codes. Sometimes, addressing related codes can help in diagnosing the root cause of the issue.
6. **Professional Diagnosis:**
If you're unable to identify and resolve the issue through the above steps, consider seeking professional help. A qualified mechanic or Hyundai dealership may have specialized diagnostic tools and expertise to pinpoint the problem.
Remember, the VVT system is a complex part of the engine, and addressing issues with it may require a systematic diagnostic approach. If you're not comfortable performing these steps or if the problem persists, seeking professional assistance is advisable. They can perform more in-depth diagnostics and provide a precise solution based on the specific conditions of your Hyundai Elantra GL.

Remove one of the spark plugs and check to see if it is getting spark. If it is not getting spark then you have a ignition problem.

There are five safety recalls on the 2003 Elantra. Two are related to a valve in the fuel system, one to a rust-prone suspension control arm, and two to the rear brake lines.

http://www.hyundaiproblems.com/recalls/Elantra/2003

Check for engine codes related to Camshaft Position Sensor or Crankshaft Position sensor. Replace as necessary.

https://www.youtube.com/watch?v=5PQlQ8K2MxU

There is no heater control valve on your elantra

P0010 is camshaft position actuator malfunction. Hope that helps

It maybe a valve cover leak, the retangular covers (2) the sparks plugs are located along the side, if you see oil around you will need to have the valve cover gasket replaced

You mention the oil control valve,so you have a 2 litre petrol engine with cvvt then?Sometimes you can remove the oil control valve and clean it out and re install it and an oil change with nice clean oil is good for them too.The ocv valve is located when plastic engine cover is removed,on the front rh top of the cyl head with an electrical plug on it.