Wiring a methanol solenoid involves several steps and precautions due to the flammable nature of methanol. A methanol solenoid is typically used in fuel systems for high-performance engines, such as those in race cars, to control the flow of methanol fuel. Here's a step-by-step guide on how to wire a methanol solenoid: 1. **Identify the Solenoid Components**: Most methanol solenoids come with two main terminals, usually labeled " IGN" (for ignition) and "BATTERY." The IGN terminal is connected to the ignition switch, while the BATTERY terminal connects to the battery. 2. **Choose the Right Gauge Wire**: Use an appropriate gauge wire for the distance between the solenoid and the battery and the ignition switch. For a 12V system, a 14-16 gauge wire is usually sufficient. 3. **Connect to Battery**: First, disconnect the negative terminal from the battery to avoid any accidental shorts. Attach one end of the larger gauge wire to the BATTERY terminal on the solenoid, using a crimp-on connector or solder and heat shrink tube for a secure connection. 4. **Connect to Ignition Switch**: Run the other end of this wire to the accessory terminal or an auxiliary power port on your ignition switch. Make sure the connection is made only when the key is in the 'ON' or 'START' position. 5. **Ground Connection**: Many solenoids also have a third terminal labeled "GND" or "EARTH." Connect a ground wire from this terminal to a clean, unpainted metal surface on the engine or chassis for a solid ground connection. 6. **Install Fuel Line**: Connect the fuel line to the inlet and outlet ports on the solenoid, ensuring there are no leaks. Use fuel-resistant hose clamps for a secure fit. 7. **Test the Circuit**: Reconnect the battery, and with the key off, check for any voltage at the solenoid terminals. There should be no voltage at the IGN terminal. Turn the key to the 'ON' position; you should now see voltage at the IGN terminal and the solenoid should activate, allowing fuel flow. 8. **Safety Precautions**: Methanol is highly flammable and corrosive, so ensure all connections are tight and free from any fuel leaks. Keep the area around the solenoid clean and free from potential ignition sources. Remember that incorrect wiring can lead to engine damage or even fire hazards. If unsure, consult a professional mechanic or refer to the manufacturer's instructions.

There could be multiple reasons why your engine is vibrating: 1. Engine Mount: If your engine mounts become worn or broken, your engine will move and vibrate drastically. This is a severe condition and needs immediate attention. 2. Spark Plugs: If spark plugs are not firing as they should, they can cause the engine to run unevenly, leading to vibration. 3. Faulty or Failing Belts: Another common cause could be a faulty or failing belt. These belts can cause the engine to vibrate if they fray, stretch, or wear unevenly. 4. Uneven Tire Wear: If your tires are worn unevenly or are out of balance, it can cause the vehicle to vibrate. 5. Dirty or Clogged Fuel Injectors: This can cause your engine to misfire, which in turn can cause the engine to vibrate. 6. Ignition System Problems: Malfunctions in the ignition system can cause the engine to run imbalance, leading it to vibrate. To fix the issue, it is recommended to bring your vehicle to a professional mechanic who can diagnose and repair the problem accurately.