The spark plug wires are manufactured with low resistance, durable material that can stand harsh conditions under the hood, as well as the high voltage of the ignition system. Knowing the symptoms of bad spark plug wires, how to test them, and how to replace them will save you a lot. When they start failing, you will notice several symptoms of faulty ignition leads that pop up to tell you something is wrong.
Failure to track down the cause of these signs and fix them on time might lead to more significant problems. Hard starting : Many factors can cause hard starting. It could be due to a corroded battery terminal, lousy starter, lousy injectors, or faulty ignition leads. Aside from the causes mentioned above, there are some other factors as well. However, defective spark plug wires can be the culprit without prior notice. Ensure you inspect your ignition cables.
Engine misfire : Engine misfire is what no driver or car owner would ever want to experience. Unfortunately, it is inevitable. At one point or the other, every road-going vehicles experience engine misfiring, irrespective of the year, make, and model of your vehicle. It is caused as a result of incomplete or erratic combustion.
As spark plugs are designed to create Sparks at predetermined intervals, Faulty spark plug wires will not transmit the required spark from the distributor, or ignition could resulting in an engine misfire. Engine hesitation : When the ignition leads develop cracks or degrade, it will transfer irregular electrical spark to the spark plugs. This is true due to electrical misconduct transmitting from the ignition coil or distributor to the spark plugs.
Electrical misconduct causes engine hesitation, mostly when giving gas to the engine. Engine hesitation is also one of the common symptoms of bad spark plugs. Engine rough idling : Rough idling is a common engine problem that many factors can cause. However, rough engine idling can be challenging to diagnose since many factors can be the culprit.
Inspecting and fixing the problem sooner than later will save you from more significant issues. Bear in mind that rough idling is one of the major symptoms of bad ignition coil rather than spark plug wires. You need to ensure ignition leads are the cause before removing them. Reduced engine power : The engine spark plugs need undeteriorated electrical conduction to ensure a predetermined spark during the combustion process. Any deterioration on the spark plugs or spark plug wires will negatively affect the combustion process, leading to loss of engine power.
If defective spark plug wires interfere with an electrical passage, your vehicle will suffer a significant loss of engine power. Check engine light : Cars nowadays are built with tons of sensors that send signals to the car computer.
If anything goes wrong, the sensor in charge of that domain will send a notification to the car computer, and as a result, the check engine light will pop up on the dashboard to notify the driver of a problem that needs attention. And engine misfire or bad spark plug wires is no exception. Bad spark plug wires share similar signs and symptoms with many faulty engine components like spark plugs, ignition coils, fuel filters, to mention just a few.
When you notice the symptoms above, the good idea is to test your spark plug wires to ensure they are the cause. That means disconnecting the spark plug wires one after the other and connect them back after each test. Doing this one at a time, you will not mix up the cables. Mixed-up wires will cause severe engine misfire.
Ensure you write down and follow the engine firing order so the vehicle will continue to run nice and smoothly. Step 1. Spark plug wires also referred to as ignition wiring transfer the spark from the distributor or ignition coil to the plugs. The subsequent spark ignites the air-fuel mixture in the combustion chamber of your engine.
This process starts with the ignition coil, which transforms low-voltage power into extremely high voltage. However, the transfer of this energy through the ignition wires creates heat. Over time, the ignition wiring can become brittle, crack or breakdown. In such cases, a weak or non-existent spark can cause the failure of the fuel in your engine's cylinder to ignite. Depending upon how many spark ignition wires are bad, your car or truck will run poorly, or not at all.
Crank the engine and check for a good spark at the spark tester gap. A good spark will be blue-white and will be plainly visible in daylight.
If a good spark is present, the problem is probably not in the ignition system. Weak sparks are orange or red and may be hard to see in daylight. If you did not see a spark, remove the coil wire from the distributor cap. Attach the spark tester to the distributor end of the coil wire. Crack the engine and check for a good spark at the spark tester. If a spark is present, the problem is probably in the distributor cap, rotor or spark plug wires.
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