GM 91172315 Wire,Spark Plug #4 Cyl

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The spark plug wires should be checked at the recommended intervals and whenever new spark plugs are installed in the engine. Inspect the wires one at a time to prevent mixing up the order, which is essential for proper engine operation. Disconnect the plug wire from one spark plug by grabbing the rubber boot, twisting slightly and pulling the wire free. Do not pull on the wire itself, only on the rubber boot. Check inside the boot for corrosion, which will look like a white crusty powder. Push the wire and boot back onto the end of the spark plug. It should be a tight fit on the plug. If it isn't, remove the wire and use a pair of pliers to carefully crimp the metal connector inside the boot until it fits securely on the end of the spark plug. Using a dean rag, wipe the entire length of the wire to remove any built-up dirt and grease. Once the wire is clean, check for holes, burned areas, cracks and other damage. Don't bend the wire excessively or the conductor inside might break. Disconnect the wire from the distributor cap, pulling only on the rubber boot. Check for corrosion and a tight fit in the same manner as the spark plug end. Reattach the wire to the distributor cap. Check the remaining spark plug wires one at a time, making sure they are securely fastened at the distributor and the spark plug when the check is complete. If new spark plug wires are required, purchase a new set for your specific engine model. Wire sets are available pre-cut, with the rubber boots already installed. Remove and replace the wires one at a time to avoid mix-ups in the firing order. The wire routing is extremely important, so be sure to note exactly how each wire is situated before removing it.