Here is a general overview of the steps involved:
1. Remove the 2.0 engine and transmission. This will involve disconnecting all the electrical connections, fuel lines, and exhaust system components.
2. Prepare the engine bay for the 1.8 engine. This may involve modifying the engine mounts and transmission mount, as well as the wiring harness.
3. Install the 1.8 engine and transmission. This is the reverse of Step 1.
4. Connect all the electrical connections, fuel lines, and exhaust system components.
5. Start the engine and check for leaks.
It is important to note that this process requires advanced mechanical skills and knowledge. It is also important to source the correct parts for your specific vehicle, as there are many variations of the Golf Mk4. If you are not confident in performing this conversion yourself, it is best to consult with a qualified mechanic.
