Hummer 12579355 Wire Assembly, Ignition Coil

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Spark plug wires should be inspected at the prescribed service interval and always when the spark plugs have been replaced in the engine. Some models for example the 4.3L V6, 5.0L V8, 5.7L V8, 7.4L V8 contain spark plug wires that runs from the plug to the distributor whereas models like 4.8V V8 models, 5.3V V8 and 6.0 L V8 contain individual coils for each cylinder so they will only contain short plug wires. For access, loosen the front wheel lug nuts and then chocks the vehicle on a jack stand, then pull off the wheels and inner fender splash shields. Initially, perform a surface check using the engine while running with your lights off identifying those spark plug wires which arc or spark. A plug wire can be disconnected simply by holding firmly the rubber boot on it and twirling it and pulling it downward without having to hold the wire. Inspect the corrosion on the inside of the boot making sure that it gives a perfect fit on the spark plug; Trim the metal connector if it has been laid back in order to make a perfect connection. Using a rag wipe the wire down, ensuring that it isn't bent too many times or otherwise damaged. Remove a wire from the distributor cap or coil, inspecting the corrosion and proper fit before reconnecting the wire. Perform the same process on all spark plug wires making sure they are properly connected. If new wire is required it is recommended to get a set of wires appropriate for the particular model of the engine, connect them one at a time restoring the firing order and ensuring the right wire path. In case of the engine has a distributor, then, using a wrench, unscrew the distributor cap screws and lift the cap up while still connected to the wires and then examine the rotor for crack or any sign of wear and if, then replace it. The rotor has to be fitted accurately so that the internal key has to fit into the slot provided in the shaft. Check distributor cap for signs of wear and rust, if it is worn or rusty replace it, after that apply silicone dielectric grease around any terminal before the cap is reinstalled. Carefully connect the spark plug wires to the new cap so that they don't get mixed up and then the cap back to the car then screws it down.

To ensure the proper functioning of spark plug wires, they should be regularly inspected at recommended intervals and whenever new spark plugs are installed in the engine. V6 engines have spark plug wires that go from the spark plugs to an ignition coil assembly, while V8s use a separate coil for each cylinder connected by short plug wires to its respective plug. To start, visually inspect the wires while the engine is running in a dimly lit, well-ventilated environment. Look closely at every wire to see if there is any arcing or sparking between points where it is damaged. Presence of arcing indicates the wire is broken and it should be replaced. Shut the engine off and disconnect one plug wire from one spark plug by turning and pulling gently on the rubber boot without touching any moving parts of the engine. Check inside the boot for corrosion which looks like white crusty powder. After screwing back the wire into its place around a spark plug tightly enough, wipe its entire length using a piece of cloth, inspect it for damage and prevent conductor breakage resulting from too much flexing of it. Do this in a similar way for V6 engines removing their wires from coils assembly checking for corrosion and having them securely fitted again. These procedures must also be repeated on other wires making sure that they are solidly attached both ends when latched onto each other properly. If you have to buy another set, make sure to get one specifically made for your car's engine model; replace them individually so as not to confuse cylinder firing order patterns with other firing orders.

If replacement is necessary, obtain a new set tailored to your engine model, and replace the wires one at a time to avoid firing order mix-ups. Pay close attention to the wire routing, and on V6 engines, release the ignition wire loom clamps to swap the wires before securing the clamps onto the new wires.

Check the remaining spark plug wires one at a time to ensure they are securely fastened at both ends.

Spark plug wires should be regularly inspected to ensure their proper functioning.

If replacement is necessary, obtain a new set tailored to your engine model, and replace the wires one at a time to avoid firing order mix-ups. Pay close attention to the wire routing, and on V6 engines, release the ignition wire loom clamps to swap the wires before securing the clamps onto the new wires.

If replacement is necessary, obtain a new set tailored to your engine model, and replace the wires one at a time to avoid firing order mix-ups. Pay close attention to the wire routing, and on V6 engines, release the ignition wire loom clamps to swap the wires before securing the clamps onto the new wires.

Perform a visual inspection of the spark plug wires while the engine is running in a well-ventilated, dimly lit area. Carefully observe each plug wire for any signs of arcing or sparking at damaged areas.

If arcing is observed, replace all spark plug wires.