Your vehicle's ignition system needs to be effective, consistent and precise - that's why it's important to replace your Oldsmobile spark plug wires with the brand-name, recognized manufacturers on our site. Your engine depends on the spark that your plug wires provide. The spark begins the combustion cycle, so a misfire or a poor spark will curtail your engine from reaching its peak power and efficiency. With proper Oldsmobile spark plug wires, your car will enjoy more complete combustion cycle, a reduction in misfires and the fuel will be more efficiently used. Nowadays, because of modern engines that can regulate or moderate misfirings, sometimes misfirings are hard to detect. Luckily, new emissions-control standards require the engine computer's on-board diagnostics system to log trouble codes for each of the cylinders. That can make it easier to trace the problem. You should inspect your wires when you notice a rough idle, since that which might actually be misfires. You might notice poor acceleration or fail an emission test that is attributed to too-high emissions. Your gas mileage might drop, or if a fault code shows cylinder misfire. If one of these events has occurred, first do a visual check of your Oldsmobile spark plug wires. Often, the issue can be traced to loose terminals. That can happen when the plug wires are mishandled accidentally during other kinds of car maintenance operations. A mechanic or DIYer can carelessly tug on the wires, disconnecting or loosening them at their boots. So be careful when handling those Oldsmobile spark plug wires!