What’s the difference between a good set of spark plug wires and an economy set And, since most later model car engines run almost 100,000 miles on a set of spark plug, it’s best to change the spark plug wires when you change the plugs. So it makes no sense to try to squeeze more life out of old spark plug wires. And that can cost upwards of $1,200 to replace. But worse than that, those misfires can destroy your catalytic converter. You can test all you want, but spark plug wires don’t least forever. So if you find a wire with significantly less or more resistance, you know that it’s defective.
So if you test a 3-ft spark plug wire and get a reading of 10,000 ohms, all other 3-ft. The actual value you get from testing each wire isn’t as important as the consistency between the wires. Testing Distributed Resistance Spark Plug WiresĪs I said earlier, distributed resistance type wires have a resistance value of 3,000 to 12,000 ohms per foot. If you car came with them, replace them with the same style. They’re made with a steel or copper core and a resistor located in the spark plug boot. The third type of spark plug wire is the fixed resistor style. If your vehicle came with MAG wires, you MUST replace them with the same type. MAG wires have far less electrical resistance and because of that, they require less current to fire the spark plug. The reason for the spiral is that it creates a magnetic field and that field reduces RFI. MAG wires are made with a spiral wound core of copper/nickel allow wire. In fact, Honda, Acura, Toyota, and Lexus usually install MAG spark plug wires in their vehicles. Japanese manufacturers, on the other hand, prefer inductance (MAG) spark plug wires. Domestic car makers preferred this type for their vehicles Distributed resistance type wires have a resistance value of 3,000 to 12,000 ohms per foot. RFI can mess up radio reception and if it’s severe enough, it can interfere with sensor signals and computer operation. Carbon creates high resistance and that reduces radio interference (RFI) generated by the ignition coils. That’s impregnated with carbon and surrounded with silicone insulation. This will add to the repair cost.Fiberglass carbon core of distributed resistance style spark plug wire Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues.This may increase the parts and labor cost for the repair. Some engines require that the intake manifold be removed while replacing spark plugs.It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.This may increase the cost of your repair. If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time.Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
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