* Battery/Electrical Connection: The most common reason a car won't crank is a dead or weak battery, loose battery terminals, or a problem with the main power cable to the starter motor. Check the battery voltage (should be around 12.6V when not cranking). Tighten battery terminals and inspect all cables for corrosion or damage.
* Starter Motor Issues: The starter might have failed (although less likely directly related to the cleaning). A mechanic can test the starter directly.
* Loose or Disconnected Components: Double-check all connections related to the EGR valve and throttle body. Ensure all sensors, vacuum lines, and wiring harnesses are securely attached. Even a slightly loose connector can interrupt the system's operation and prevent cranking. Pay close attention to the throttle position sensor (TPS) as it's crucial for starting.
* Throttle Body Position Sensor: If the TPS was accidentally disconnected or damaged during cleaning, this will prevent the car from cranking.
* Immobilizer System: Some cars have an immobilizer system that prevents the engine from starting unless the correct key is used. If you had trouble with the key or changed something during your work, this could be the issue.
* ECU Issues: Although less likely, if something was damaged during cleaning (e.g., a sensor short-circuited), it might have affected the Engine Control Unit (ECU). This would require professional diagnostics.
* Fuel Pump: While less directly connected to the throttle body and EGR valve, it's a possibility. Listen for the fuel pump prime when you turn the key to the "on" position before cranking. A non-functioning fuel pump would prevent the engine from starting.
Troubleshooting Steps:
1. Check the battery and connections: This is the first and easiest thing to check.
2. Visually inspect all connections: Make sure everything is properly reconnected to the throttle body and EGR valve.
3. Check fuses: Review the owner's manual to find fuses related to the engine, ignition, and fuel system.
4. Listen for the fuel pump: When you turn the key to the "on" position (before cranking), you should hear a brief whirring sound from the fuel pump.
5. Attempt to crank again: See if the car will start after checking the above steps.
If the problem persists after these steps, you'll likely need to seek professional help from a mechanic or auto electrician. They have diagnostic tools to pinpoint the exact cause of the problem. Be sure to mention the recent cleaning of the EGR valve and throttle body – this information will be helpful for them.
