![]() P0304 OBD II Code Causes: Buick Encore A fouled iridium plug vs. You may smell raw gas coming from the tailpipe.Your Encore may produce excess vibration, especially at lower RPM.Your vehicle may run rough, be down on power, and stall.There may be no noticeable symptoms at all. Here are the most common symptoms of P0304 in the Buick Encore. If one of the above variables is off, your Encore’s fourth cylinder will misfire, or it won’t fire at all. Compression– The air-fuel mixture must be compressed during the engine’s power stroke.Spark– The spark plug needs to fire at the right time and at the right temperature (diesel excluded).Air– It needs to be metered by your Encore’s mass air flow sensor or MAP sensor, so the powertrain control module (PCM) knows exactly how much air to let into the combustion chamber.Fuel– In the right quantity (around 14.7 parts air to one part fuel).In order for an engine to burn fuel efficiently, each cylinder needs the following: On inline engines, the fourth cylinder will usually be the fourth in from the engine accessories.Ī quick Google image search will confirm the correct cylinder (include your Encore’s model year and engine type), or they can print it up for you at most parts counters. On “V” configuration engines, it’ll usually be the second cylinder on the head further away from the front of the engine. P0304 is a cylinder-specific misfire code, meaning only your Encore’s fourth cylinder has a misfire.īefore you can even diagnose P0304 in your vehicle, you need to find the fourth cylinder’s location. P0304 Definition: 4’th Cylinder- Misfire Detected 4’th Cylinder The most common repair for P0304 is changing the spark plug in cylinder four. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion, and driving with a misfiring engine can damage your Encore’s catalytic converter. Repairing P0304 should be considered a high priority. If it’s bad enough to cause your Encore’s check engine light to flash, avoid driving your vehicle altogether until you find the misfire and repair your engine. ![]() P0304 is a drivability concern and should be dealt with right away. It’s a generic OBD IIcode (same meaning for all vehicles) that indicates that your vehicle’s fourth cylinder is misfiring. If your Buick Encore has the P0304 trouble code, you should know that it’s about as common of a code as there is.
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