![]() Silicone spray not only can provide a shiny new look to the entire engine in general. Another common sign that spark plug wires need to be replaced is a rough idle, a bad gas mileage, or even a stalled engine. Starts your truck or car, and you’ll notice a difference right away! Take care to remove any traces of dirt, oil, and grime from your vehicle. Scrub the threads with the wire brush from a perpendicular angle to the plug to remove the gunk, then scrubbing from other angles to get the maximum effect when cleaning the threads. When the key is turned to the on position, current travels through both armatures, initiating a spark at the plug. Removal of the plugs to manually or sandblast them clean would allow for the vehicle to run more optimally. A swab soaked in Methyl ethyl ketone (MEK, or butanone) works well to clean the insulator and ignition lead contact in the opposite end of the plug.
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