![]() You should hear it coming from the top of the motor. What happens as a result is a knocking or rattling sound. However, if the phaser has failed, it might not be capable of locking in place. The cam phaser should lock in position when the engine is at its base idle. You might notice trouble accelerating, a rough idle or trouble getting all of the power it normally exhibits. With either of these problems, the engine is going to exhibit performance issues as a result. If the cam phaser isn’t operating correctly, the timing is going to be retarded or advanced. The valve timing must be optimized to ensure the engine runs as it was intended. By reading the diagnostic trouble codes with your professional scanner, you should be able to narrow down the problem better. ![]() While this positioning problem could be the result of something else, it’s commonly an issue with the cam phaser. If the module gets a poor reading from the sensors, it’s going to turn on the Check Engine Light. With the help of the powertrain control module (PCM), the camshaft positioning is always monitored through sensors. The car computer lets you know whenever something is wrong with the system. Here is a more detailed list of the signs of a bad or failing cam phaser to look for: 1. You may also notice that the engine is noisier than usual, indicating that you need to inspect and fix it immediately. The most common symptoms of a bad cam phaser are lower engine performance and a check engine light on your dashboard.
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