What are the symptoms of bad spark plug wires?
The following are common signs that your spark plug wires have issues.
Do spark plug wires really make a difference?
There isn't any performance to be gained from spark plug wires, just better build quality, which gives you not a better spark, but rather maintains an appropriate spark for more miles/years before their performance degrades to the point of needing replacement.
Can bad spark plug wires cause a car not to start?
Can a bad spark plug wire cause the car not to start? Absolutely yes. The spark plug wires' primary work is to supply the necessary spark from the distributor or ignition coil to the spark plugs. If the spark plug wires fail, it can provide insufficient spark to burn air/fuel mixture in the combustion chamber.
Re: Are spark plug wires supposed to get too hot to touch? No, there's no way the battery or any other wiring fault will cause the plug wires to get hot; they're not actually connected to anything at either end - there are air gaps at the plugs & in the distributor cap.
When your spark plugs are performing as they should, your engine sounds smooth and steady. A fouled spark plug causes your engine to sound rough while idling. You might also feel the vehicle vibrating.
If you want long-lasting plugs that will reduce the work you need to do replacing plugs and don't mind paying extra for that luxury, yes. If you are designing an extremely high performance car where the plugs will be subjected to extreme conditions, they are probably a good idea.
In short, yes, in some situations spark plugs can increase horsepower. The theory behind spark plugs increasing horsepower is that by providing more spark to the firing tip of the spark plug, it will (and does) combust more fuel.
Symptoms of misfiring spark plugs include rough idling, uneven power when accelerating, and an increase in exhaust emissions. Note that a check engine light could be potentially caused by a number of things, not just a spark plug problem.
your engine is running poorly: an arcing or high-resistance plug wire will prevent the spark plug from firing properly. this results in incomplete combustion, causing the engine to misfire.
Spark plug incorrectly tightened, engine cooling problem, ignition timing too early, spark plug heat range too low, severely abnormal combustion.
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. Check the fuel system and/or stark timing. Weak sparks are orange or red and may be hard to see in daylight.
Spark Plug Wires with Melting Problems
Typically, spark wires are situated beside headers. When the headers get heated, there is always a chance to melt down the wires. Mainly, these wires are made of silicon jackets and many insulators.
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. If the damage is bad enough, you may also notice your engine running rough while driving.
If the spark is still weak after replacing the whole ignition system, then the normal size wiring or connector to the coil may be corroded or damaged somehow. The other real longshot is that the grounding strap between the engine/trans, body, and negative battery terminal is corroded/worn/damaged.
That's why it pays to replace your spark plug wires before they wear out. We recommend changing them during spark plug changes (whenever your owner's manual recommends, usually between 60,000 and 100,000 miles).
If your car is experiencing any of the problems listed below, you may have a faulty ignition coil on your hands:
Poor fuel pressure, faulty spark plugs, and misfires are some of the things that can cause shaking or vibration.
Failing spark plugs can cause the car engine to misfire and thus affect its performance. A single spark plug that fails to ignite the fuel-air mixture can cause a halt in the running of the engine. It can result in incomplete combustion and damage to the catalytic converter of the car.
Most of NGK's spark plug wire sets use high quality EPDM and silicone coverings to resist heat, oil, and chemical damages for increased durability. Each spark plug wire features a positive locking, corrosion resistant stainless steel terminal end, ensuring tight fit and maximum resistance to vibration and separation.
8mm spark plug wires are a heavier gage wire than the 7mm type. A more robust core provides a lower resistance path for the power, thereby allowing more power to reach the spark plugs. Additionally, the 8mm wires have a thicker outer coating that keeps the core safe from damage.
Plug wires are most often rated by their diameter. The most common are 7mm and 8mm thicknesses, but what's more important is the conductor. The best choice is the spiro-wrap style Taylor wires that reduce resistance, minimize RFI noise, and offer the best performance.
Although many motorists and technicians prefer to stick with the same brand when replacing spark plugs, there's nothing on the label that limits a particular brand of plug to a particular vehicle make or model.
Upgrading your spark plugs will enhance your car's performance. Standard spark plugs often have troubles firing, which can decrease the speed and reliability of a car. With newer high performance spark plugs, misfires are far less frequent. This reduces the emissions from the car while also increasing fuel efficiency.