A bad universal joint in a vehicle is detected by looking out for signs such as dust and excessive vibration in the prop-shaft. The U-joint cannot be dismantled in most current car models, as it is permanently joined to the prop-shaft, thus requiring the entire shaft to be changed.Know More
Excessive vibration in the prop-shaft is one indicator of a worn U-joint. Depending on the car model, the joint is lubricated or replaced, or the prop-shaft is replaced entirely.
A clonking sound when accelerating or decelerating is another indicator of a bad joint. A regular knock when the car is in motion is also an indicator of a bad joint.
There should be no play in the joint if it is in good condition. To check the condition of a U-joint, firmly grip one side of the joint and try to turn the other side. The joint should hold firmly if it is in good condition. Alternatively, insert a large screwdriver between the levering and yoke to see if there is any play. A new joint or prop-shaft needs to be fitted if any play is detected.
The presence of rust-colored dust around the spider is an indication of a faulty U-joint. Put in a new shaft or joint immediately when dust is detected around the spider.
To replace a universal joint, remove the drive shaft as well as the clips holding the U-joint in place, mount the drive shaft in a vice, and tap the top of it to remove the bearing and U-joint. Install the new joint, and remount the drive shaft.Full Answer >
Diagnose a bad coil pack by using an ohmmeter to compare the vehicle's readings to standard values for the vehicle. Use a scan tool to determine which cylinders are misfiring as a result of the defective ignition coil. Water can also help to diagnose a bad coil. Use a spray bottle to mist water over the coil pack to determine which areas of the engine are misfiring.Full Answer >
One of the most commonly seen symptoms that a car's water pump may be bad is puddling of water or coolant underneath the vehicle. An overheating engine may mean earlier signs were missed or ignored.Full Answer >
Symptoms of a failing fuel pump include increased fuel consumption, gasoline odor in the vehicle, reduced engine power and acceleration, engine stops running during operation, car is hard to start or won't start, check engine light with a low fuel-pressure code and a whining noise from the gas tank.Full Answer >