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Unfortunately, there can be several different reasons that could duplicate the sound of a knock in the engine. With the information provided being limited, it is difficult to determine what the cause of the knock is. In a best case...
Hello. Several owners of the BMW 750i have complained of this issue. The usual fix required is a PCM reflash. The PCM flash will have to be done by BMW but it is the most likely cause and most common...
You are correct to suspect the differential. Other parts of the undercarriage, such as the tires and wheel bearings (https://www.yourmechanic.com/services/wheel-bearings-replacement), usually result in a noise that persists during both acceleration and deceleration. Whining and howling noises are usually related to...
I would recommend replacing the starter relay in the engine compartment's junction box. The relay may have intermittent relay contact issues. The relay may not be the cause but is the least cost alternative to being stranded in the future....
The most likely cause of the hard start (https://www.yourmechanic.com/services/car-is-hard-to-start-inspection) after getting fuel is going to be a leaking fuel vapor purge valve. The leaking purge valve would allow the fumes that build up in the fuel tank while refueling to...
Engine misfires can be caused by many different problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark related...
The most common cause of an no start with no spark is going to be the crankshaft sensor causing the no start. The vehicle should be scanned to see if there is an input from the crankshaft sensor to the...
The Harmonic balancer has a steel center hub and outer ring that are bonded to a rubber ring that separates them. When the car is very old, the adhesive in the balancer dries up and the outer ring might start...
Hi there - yes, it is possible to get replacement air bags, and other damaged supplemental restraint system components for a 17-year old car. This is, however, very sensitive work, and should only be done by a qualified auto body...
The engine (https://www.yourmechanic.com/article/how-a-modern-engine-works) under the hood is the most important component of a vehicle. Without the engine, your car cannot run and is of little value to you. If you have been in an accident, or neglected your engine to...