Symptoms of a bad coil pack include rough engine idling, misfiring, lack of power during acceleration, gasoline odor emanating from the exhaust system and illumination of the check engine light. In newer vehicles, the coil pack replaces the distributor.Continue Reading
A coil pack is a collection of ignition coils that transforms power from the automobile's battery to generate sparks to the spark plugs that drive the engine's cylinders. Coil packs provide better horsepower than distributors used in older vehicles.
A bad coil pack can be diagnosed with a visual inspection of the spark plugs, which show charred or blackened deposits on the spark contact points. However, testing with an ohmmeter definitively determines whether the coil pack is defective and needs to be replaced.Learn more about Car Parts & Maintenance
The common symptoms of an onboard diagnostic code P0700 transmission control system malfunction include illumination of the check engine light, decreased fuel economy and difficulty shifting. In rare cases, the issue causes no symptoms, other than illuminating the check engine light. Some drivers note vehicle performance problems such as the vehicle dying when it comes to a stop after driving at highway speeds.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 carburetor vacuum leak, which is the same as an engine vacuum leak, include a hissing sound, an illuminated check engine light and poor acceleration. This condition also causes loss of power, low fuel economy and engine damage.Full Answer >
Cars that have a faulty oxygen sensor will commonly have a poor idle, jerk erratically at a steady throttle or emit a rotten egg odor from the exhaust pipe. If a car has a bad or broken oxygen sensor, this will cause the car to operate less efficiently, causing other problems like the car being difficult to start, its "check engine" warning light coming on or an abnormally high rate of fuel consumption.Full Answer >