Sometimes rattling noises might require serious engine repair. The first step you need to take is to isolate the cause of the rattling noise. Does it occur only when accelerating the vehicle? Or is the noise prevalent even during idling or cruising? Is the rattling noise coming from the front or rear? By determining the source of the rattling sound, it will be easier to diagnose the fault. Take a friend with you as you drive, preferably someone who knows a thing or two about cars. Open all the windows and turn off the radio. Find a nice and quiet place to drive to make the job easier. Step on the gas and accelerate slowly and wait for the rattling noise to occur. Possible Causes of Engine Rattling Noises When Accelerating Windows not opening? You could have a bad regulator or power window motor. If you have an older car with a lot of miles on the odometer, rattling noises in the engine can be caused by the following problems: 1. Issues with the valve train Img source: Edfooliuĭo you hear rattling noises similar to the sound of clinking bottles when accelerating the vehicle? The noise is caused by a sticky valve train. Some experts even call this rattling noise as ‘carbon rap’ and is caused by worn or sticking valves and hydraulic lifters. It can also be caused by dirty oil and using the improper fuel octane required for your vehicle.Ĭarbon rap is caused by premature ignition of the air and fuel mixture inside the motor. If you confirm the rattling noise is caused by the valve train (the valve train is located on the top of the motor), check the condition of the motor oil. It is also a good idea to confirm you’re using the right fuel with the right octane level.īetter yet, change the oil and see if the problem is eliminated. A car that requires 95 octane fuel should always be filled with the same type of gasoline. Using lower octane fuel will degrade engine performance and cause rattling sounds when accelerating. If the problem doesn’t go away, you should also check the ignition timing and the EGR valve of the motor. Rattling sounds can also be caused by problems with the engine ECU or knock sensors in the engine. In worst cases, the hydraulic lifters and valves will need to be replaced, resulting in a mild overhaul or top overhaul of the motor. If you’re lucky a simple valve adjustment will suffice. When in doubt, it is still best to consult a professional mechanic. Read more about replacing knock sensors 2. This solution is ideal for vehicles equipped with automatic transmissions. Similar to the engine, the A/T will only run properly when filled with the right amount of transmission fluid. Rattling noises when accelerating can be caused by low fluid levels in the A/T. If the car is running low on transmission fluid, refill the reservoir to the proper level.
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