Vehicles with a bad manifold absolute pressure (MAP) sensor typically run rough while accelerating, decelerating or idling. Other common symptoms include increased fuel consumption and sudden jerks or hesitation while accelerating. Drivers may detect a strong smell of gas after the engine has warmed up.Know More
A MAP sensor works together with the electronic control unit, or ECU, in cars that are equipped with fuel injection systems. The MAP sensor helps the ECU calculate the amount of fuel needed for efficient consumption by monitoring the engine's mass airflow rate. MAP sensors are not critical components however, and cars with bad MAP sensors will still run, albeit with less efficiency and greater fuel consumption. Ignoring a faulty MAP sensor can lead to other engine problems, so it still should be checked if a problem is suspected.
To check for a faulty MAP sensor, a complete engine diagnostic will need to be performed. Replacing a MAP sensor requires some technical skill. However, not all faults will call for a sensor replacement. Sometimes, symptoms linked with a MAP sensor may be caused by something less severe, such as a hole in the hose attached to the intake manifold. Having a car inspected by a professional is the surest way of diagnosing the problem and preventing the fault from worsening.Learn more about Car Parts & Maintenance
Problems with acceleration, engine misfires, reduced fuel mileage, stalling and difficulties starting the vehicle are all possible symptoms of a bad crankshaft sensor, according to 1A Auto. A bad crankshaft sensor may also cause the vehicle to idle roughly or make the check engine light come on.Full Answer >
A faulty camshaft sensor results in numerous problems with a car, including an illuminated check engine light, a poorly running engine and difficulty or failure to start. The camshaft sensor replaces the distributor in many modern cars, and if it malfunctions, the spark plugs fail to fire correctly. According to O'Reilly Auto Parts, faulty camshaft sensors are the 11th most common automotive repair.Full Answer >
According to Repairpal.com, symptoms of a bad knock sensor include poor acceleration, knocking noises during acceleration, poor fuel mileage and a visible check engine light. The symptoms of a bad knock sensor typically occur during heavy loads or at high speeds. Autopartswarehouse.com explains that the knock sensor has a direct effect on the engine’s ignition timing. A bad knock sensor causes a decrease in acceleration and fuel mileage.Full Answer >
The symptoms of a bad oxygen sensor or O2 sensor include mileage decrease, trouble code display on on-board diagnostic system and a smog test failure. Among other factors, an illumination of the car's malfunction indicator lamp can be a sign of a faulty oxygen sensor.Full Answer >