1. Incorrect Spark Plugs: If the spark plugs you installed are not the correct type or have an incorrect heat range for your vehicle, it can cause pre-ignition and lead to knocking sounds. Make sure that the spark plugs match the specifications recommended for your Voyager in the owner's manual or by the vehicle manufacturer.
2.Faulty Spark Plug Wires: If the spark plug wires are not seated properly or have poor electrical connections, it can result in inconsistent firing of the spark plugs and create knocking noises. Check that the spark plug wires are correctly connected to the ignition system, with a tight and secure fit on the spark plugs and distributor.
3.Ignition Timing: Changing spark plugs and wires may affect the ignition timing. The Voyager has a distributorless ignition system, where the computer controls ignition timing. If the ignition timing is not set correctly, it can lead to knocking sounds. This is not something you can adjust at home, you will need to take it to a mechanic to get the timing correctly adjusted.
4.Engine Carbon Buildup: Carbon deposits on the piston rings, valves, or engine cylinders can cause knocking sounds when the engine is running. Check if your Voyager is due for an engine cleaning service, which can remove carbon buildup and improve engine performance.
5.Fuel Octane: Using a lower-octane fuel than recommended for your vehicle can result in knocking sounds in engines with high compression ratios like some Plymouth Voyagers. Make sure to use the recommended fuel octane level specified in your owner's manual.
If the knocking persists after checking these factors, it's advisable to consult a qualified mechanic for further diagnosis and servicing of your vehicle's engine to ensure its smooth and reliable operation.
