1. Incorrect Installation:
* Wiring: The most likely culprit is incorrect wiring. The ignition switch has several wires, and even a slight misconnection can prevent the car from starting. Double-check the wiring diagram for your specific Malibu model against the connections you've made. A wiring diagram can usually be found online (repair manuals or forums dedicated to Chevy Malibus are good resources). Ensure each wire is firmly connected and in the correct position. A loose or incorrect connection can cause a short circuit.
* Switch Orientation: Make sure the ignition switch is installed correctly. There might be a specific orientation or alignment it needs to be in. Check the old switch for any markings or consult a diagram.
2. Other Related Components:
* Ignition Cylinder: Was the ignition cylinder (the part you put the key into) replaced as well, or just the switch itself? If the cylinder wasn't replaced and was faulty, it could still be preventing the car from starting, even with a new switch.
* Immobilizer System: Some 2001 Malibus may have a passive anti-theft system (PATS). If the key isn't properly recognized by the system, the car won't start, even if the switch works. Try another key if you have one.
* Neutral Safety Switch: This switch prevents the car from starting unless it's in park (automatic) or neutral (manual). Make sure the gear selector is in the correct position. A faulty neutral safety switch can also cause starting problems.
* Battery: Check the battery's voltage. A weak battery can prevent the starter from engaging.
* Starter Motor: If the battery is good, the problem could be with the starter motor itself. It might be faulty or not getting power.
* Fuses and Relays: Check all fuses and relays related to the ignition system. A blown fuse or a faulty relay can interrupt the electrical circuit to the starter.
Troubleshooting Steps:
1. Recheck the Wiring: This is the absolute first thing you should do. Carefully examine each wire connection to the new ignition switch.
2. Consult a Repair Manual: A repair manual specific to your 2001 Chevy Malibu will provide detailed wiring diagrams and instructions.
3. Test the Battery and Starter: Have someone check your battery and the starter to rule these components out.
4. Check Fuses and Relays: Locate the fuse box and relay center and inspect for blown fuses or faulty relays related to the ignition system.
5. Verify Neutral Safety Switch: Ensure the car is in park or neutral.
6. Consider PATS: If you only have one key, and it’s new, the transponder chip may not be correctly programmed. A locksmith or dealership might be needed to deal with the car's anti-theft system.
If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic. Attempting further troubleshooting without proper knowledge could cause more damage.
