1. Basic Checks (Before anything else!):
* Did you reconnect everything correctly? This is the most common mistake. Double-check that all spark plug wires are firmly seated on both the spark plugs and the distributor cap (if applicable; some 95 Accords might use coil packs). Make sure the wires are in the correct firing order. A misfire can prevent starting.
* Did you use the correct spark plugs and wires? Using the wrong type or heat range of spark plugs can cause starting problems. Consult your owner's manual for the correct specifications. Incorrect wires can also lead to poor connection or even shorting.
* Did you gap the spark plugs correctly? Incorrect gap can prevent proper spark generation. Check the gap with a feeler gauge and adjust if necessary.
* Did you damage anything during the replacement? Careless handling could have damaged a spark plug, wire, or even the distributor cap (if equipped). Inspect everything closely.
* Battery: A weak battery can prevent starting even if everything else is working. Test the battery voltage. Should be around 12.6V when not running.
2. Ignition System:
* Distributor cap and rotor (if applicable): If your Accord has a distributor, inspect the cap and rotor for cracks, corrosion, or wear. Replace if necessary. Even if the parts seemed fine, a simple misalignment of the rotor can hinder the spark.
* Ignition coil (or coil packs): A faulty ignition coil (or a coil pack in a coil-on-plug system) won't deliver enough voltage to the spark plugs, preventing a spark. Testing the coil requires a multimeter or specialized tool.
* Ignition control module (ICM): The ICM controls the ignition timing. A faulty ICM can prevent the car from starting. This requires specialized testing.
* Cranking speed: If the engine cranks slowly, the battery or starter motor might be faulty.
3. Other Potential Issues:
* Fuel delivery: Ensure the fuel pump is working. You should hear a whirring sound from the fuel pump when you turn the ignition key to the "on" position (but not cranking). Also check your fuel filter.
* Security system: An aftermarket or factory security system could be preventing the car from starting.
* Crankshaft position sensor (CKP): A faulty CKP sensor prevents the computer from knowing the engine's position, preventing proper firing order.
* Cam sensor: Similar issue to the crank position sensor, a faulty cam sensor will prevent the computer from knowing the camshaft's position.
Troubleshooting Steps:
1. Start with the basics: Double-check all connections and components you touched.
2. Test the battery: Make sure it has enough power.
3. Listen carefully: Do you hear anything unusual when you turn the key? (Clicking, whirring, etc.?) This can provide clues.
4. Check for spark: With a helper, carefully check for spark at each spark plug. Remove one wire at a time, hold the metal end of the wire near (but not touching) a ground, and have someone crank the engine. You should see a bright blue spark. If no spark at all, the problem is likely in the ignition system (coil, distributor, ICM etc.).
5. Get professional help: If you've checked all of the above and still can't find the problem, it's best to take it to a mechanic. Diagnosing ignition problems can be tricky and requires specialized tools and knowledge.
Remember safety first! Disconnect the negative battery cable before working on any electrical components.
