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What are the symptoms of a bad distributor cap and rotor

What are the symptoms of a bad distributor cap and rotor

The most common symptoms are the ignition not starting, the car not starting, the indicator light coming on and the engine making excessive or unusual noises.


A running engine sends a large amount of current through the ignition coil to the rotating distributor rotor. The rotor directs power through the spark plug wires to the engine cylinders in a specific manner, in the correct firing sequence.

The rotor and distributor cap keep the contents of the distributor separate from the engine and keep the working parts of the distributor clean and tidy, while supporting and transferring incredibly high voltages to the correct spark plugs. The spark plugs use the spark from the distributor to ignite the fuel mixture and keep the engine running.

When the vehicle is running, high voltage flows through the entire distributor system, but if there is a problem, this voltage is not transferred to the correct spark plug to keep the engine running. Rotor and distributor cap failure often causes a number of symptoms that alert the driver to the need for a thorough overhaul.

1. Engine misfiring
Misfiring can occur for a number of reasons. Checking the rotor and distributor cap to see if they need to be replaced is one way to make sure everything is working properly.

2. The car will not start
If the distributor cap is not tight or not working properly, the engine will not be able to send a spark through the entire circuit needed to move the cylinder, which will eventually cause the car to not run.

The check engine light comes on.
If you see this light and some of the other symptoms listed here, it's time to call a professional to see what the codes are in the car's computer.

4. Excessive or abnormal engine noise.
If the rotor and distributor cap are not working properly, your car will make very strange noises, especially if the cylinders try to fire but do not. If the rotor and distributor cap are defective, you may hear a knocking, popping or cracking sound.

During routine checks of your vehicle, check the ignition system for faults or problems. If you have difficulty starting your vehicle, consult a qualified automotive technician.

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