This will lead to increased emissions and can damage the catalytic converter if left unresolved. Increased EmissionsĪ badly running engine won’t be burning fuel as efficiently or may be running rich. If the ECU detects a problem with the camshaft sensor circuitry, then it may cut out the engine, or stop it from starting. In this case, a stalled engine can be caused by a lack of fuel but more often than not, it’s actually an intentional shut down to protect the engine from damage. If the ECU can’t keep track of the timing sequence of the engine, then this can cause the engine to cut out. Any problems with the timing will cause a hesitation when you press the accelerator and will usually be accompanied by lurching and stalling of the engine. The ECU uses this information to control the timing of the firing of spark plugs and the injection of fuel. The job of the camshaft position sensor is to tell the ECU where in the cycle the engine currently is. Engine Hesitation During AccelerationĪ delay in acceleration and a lack of engine power is common with a bad camshaft sensor. It’s also possible that a rough engine idle can also be caused by a stuck or failing idle air control valve. If there is no wind or road noise, the movement and noise from the valves and pistons is more noticeable, especially if the timing is slightly out. This will be more noticeable when stopped and the engine is idling. Rough engine Idle with VibrationsĪ very common symptom of a failed camshaft position sensor, is a rough or vibrating engine. This is not one of the most common symptoms of a bad camshaft sensor as it may not be as noticeable in newer engines with variable timing. Poor Fuel EconomyĪ lack of accurate camshaft position information will invariably lead to over fuelling resulting in poor fuel economy. If the sensor is still sending a signal to the ECU, then chances are the check engine light won’t come on, and it may indicate a problem with another part of the engine such as the ignition coils or spark plugs. This will cause the check engine light to flash or stay on. If the ECU stops receiving a signal from the camshaft sensor, then this indicates a problem with the sensor or some other part of the camshaft sensor circuit. Check Engine Light on the dashboardĪ broken camshaft position sensor is going to impact the timing of the engine, especially the fuel delivery timing. When it comes to the performance of the engine, here are the most common symptoms of a bad camshaft position sensor.
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Error code P0340 means that there is something wrong with the camshaft position sensor or the camshaft sensor circuit. The best way to diagnose a faulty camshaft sensor is to run a diagnostic to check for engine error codes. It’s possible that the symptoms of a bad camshaft sensor can be confused with issues with the timing belt or timing chain. This means that the engine will probably keep running, but as well as it should. If the sensor is not working properly, there is a good chance that the spark plug will be firing twice per stroke. Many engines use variable valve timing, where the camshaft sensor is needed to differentiate the compression from the exhaust stroke. If the ECU can’t accurately keep track of the camshaft position as it rotates, then this is going to affect the timing of the pistons and valves. 7 Symptoms of a bad camshaft sensorĪ bad camshaft sensor will wreak havoc with how the engine runs. Some engines have more than one camshaft sensor, so it’s necessary to use an OBD scanner when trying to diagnose problems with the sensor. It monitors the position of the camshaft by scanning the ring gear on the spinning camshaft. In general, the symptoms of a bad camshaft position sensor can include poor engine performance, lack of power when accelerating, a rough engine when idling and when pulling away, poor fuel economy, engine error codes and a check engine light on the dashboard. If the camshaft sensor is not working properly then it will severely impact engine performance. It monitors the position of the camshaft and crankshaft to determine the position of the pistons. The camshaft sensor plays a major role in keeping the timing of your engine on track.
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