* Spark Plug/Spark Plug Wire: A fouled, damaged, or loose spark plug in cylinder #2 is the most common cause. The spark plug wire could also be cracked, damaged, or poorly connected. Inspect these visually for any obvious damage.
* Ignition Coil: If your Escort has a distributor, the problem might be within the distributor itself (worn rotor, cap, or points). If it's a coil-on-plug system (more likely on a 1997 model), the coil for cylinder #2 could be faulty.
* Injector: A clogged or faulty fuel injector in cylinder #2 will prevent fuel from reaching the combustion chamber, resulting in a misfire.
* Valve Train Issues: A burnt valve, sticking valve, or low compression in cylinder #2 can prevent proper combustion. This is less likely than the ignition or fuel delivery problems, but should be considered if other checks don't reveal the issue.
* Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP): These sensors provide timing information to the engine control module (ECM). A faulty sensor can lead to misfires.
* Vacuum Leaks: While less directly related to cylinder #2, significant vacuum leaks can affect engine performance and cause misfires.
Troubleshooting Steps (in order of ease):
1. Visual Inspection: Start by checking the spark plug and wire for cylinder #2. Look for cracks, corrosion, or loose connections. If you see anything amiss, replace them.
2. Swap Parts (If Possible): If you have a spare spark plug, wire, or ignition coil, swap it with the one on cylinder #2 to see if the misfire moves to a different cylinder. This is a good way to isolate the faulty part.
3. Check for Codes: Use an OBD-II scanner to retrieve any diagnostic trouble codes (DTCs) stored by the ECM. This can significantly narrow down the possibilities.
4. Compression Test: If the above steps don't resolve the problem, a compression test can reveal low compression in cylinder #2, indicating a valve train problem.
5. Fuel Injector Test: Testing a fuel injector requires more specialized equipment and knowledge.
Important Note: Working on your car's ignition system involves high voltage. Always disconnect the negative battery cable before starting any work. If you're not comfortable working on your car's electrical system or engine, take it to a qualified mechanic. Incorrect diagnosis and repair can cause further damage.
