![]() There are also non-ignition-related circumstances that can cause your Chevy Trailblazer to misfire. There are also coil packs and spark plug wires. The real question is, what is causing the misfire? There is more to your Trailblazer’s ignition system than just the plugs. All of the other symptoms are a result of the misfiring itself. Misfiring is the most common symptom of bad spark plugs. When you take your Trailblazer in for a tune-up due to decreased fuel economy, checking the spark plugs (and ignition system in general) is going to be one of the very first places a mechanic will look at. This leads to a decrease in fuel economy. ![]() The less efficient your engine’s combustion, the more fuel will be wasted. If you have one or more bad spark plugs, it’ll cause the acceleration of the Trailblazer to be weaker. ![]() The fewer cylinders that your engine has, the more that one cylinder not firing correctly will have. If acceleration has diminished, it should be felt. For example, P0304 is for a misfire in cylinder 4.Īs you ask your Trailblazer for more power, the fuel and ignition systems respond.
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