BMW M240i Engine Makes A Ticking Noise

Common Causes of Ticking Noises in Your BMW M240i Engine and How to Address Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
12% chance it's the
Exhaust Leak
0%
88% chance it's
Something else
The most common reasons a BMW M240i engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak.
  • Exhaust Leak: A damaged exhaust manifold or a loose connection in the exhaust system can cause an exhaust leak, resulting in increased noise and potential loss of engine power.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a BMW M240i engine makes a ticking noise?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

If the drive belt tensioner fails, there will be a very audible chirping, grinding, or rattling noise from the front of the engine. This is because the tensioner pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to lose tension, or break. If the belt falls off, the accessory that it drives will no longer function. Also, if the tensioner spring fails, allowing slack in the belt, it may make an extremely loud squeaking or screeching noise combined with a rattle as the tensioner bounces back and forth under load. The squealing noise is the belt slipping on the crankshaft pulley, and will require belt replacement once the belt tensioner is replaced.

An engine leaking oil does not always make a puddle on the ground. A burning smell may be noticed from the front of the vehicle after driving. This is because engine oil leaks may fall onto hot engine components, especially the exhaust manifold, and burn off before making it to the ground. This poses a risk to the engine because the leak going unnoticed may deplete the engine oil reserve, and lead to an oil starvation issue. Some engine oil leaks only occur while the engine is running, so the leak may be larger than the small spot on the ground makes it seem.

Noises can be accompanied by many annoying or worrisome sensations. Consider the noise of grinding brakes, the noise sounds much like the brake pedal and steering wheel feel. This is important, as random noises can be difficult to replicate without knowing when the sound occurs, what must be done to make the sound, and what sound it is. Any professional technician can replicate and diagnose most noises, but to ensure the vehicle is more quickly diagnosed, make sure you tell your technician these three pieces of information.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

Troubleshooting Ticking Noise in a BMW M240i

When faced with a ticking noise in your BMW M240i, start by carefully listening to the sound to determine its origin within the engine bay. This initial assessment can help you identify whether the noise is coming from the top or bottom of the engine, which can narrow down potential causes. If the ticking is more pronounced when the engine is hot, it may indicate wear in components like the lifters or cam followers. Begin your troubleshooting with simple solutions, such as checking the oil level and quality, as low oil pressure can lead to inadequate lubrication and result in ticking sounds. An oil change or engine flush may resolve the issue if the oil is dirty or low. If these steps do not alleviate the noise, inspect the lifters and bearings for wear, as these components can contribute to ticking if they are not functioning properly. Engaging with online forums can provide additional insights and shared experiences from other M240i owners, which can be invaluable in your diagnostic journey. Remember, regular maintenance is key to preventing such issues, so ensure you keep up with oil changes and address any mechanical concerns promptly to maintain your vehicle's performance.

What Could Cause a Ticking Noise in a BMW M240i Engine?

When you hear a ticking noise in your BMW M240i engine, it’s crucial to identify the underlying cause to prevent further damage. One of the most common issues is low oil level or pressure, which can lead to inadequate lubrication and result in ticking sounds. Regularly checking and maintaining the oil level can help mitigate this problem. Additionally, problems within the ignition system, such as faulty spark plugs or ignition coils, can also produce ticking noises, indicating a need for inspection and possible replacement. An exhaust leak is another potential culprit; it can create a ticking sound that may be mistaken for engine noise, so examining the exhaust system for leaks is advisable. Furthermore, a loose lifter can cause noticeable ticking, particularly when the engine is running, and should be addressed to maintain engine performance. Lastly, faulty bearings in components like the accessory belt can contribute to ticking sounds, and environmental conditions can exacerbate these noises, especially in older models. By understanding these common problems, DIY enthusiasts can take proactive steps to diagnose and resolve ticking noises in their BMW M240i engines.

Why is the Ticking Noise in a BMW M240i Engine Urgent to Address?

The ticking noise in a BMW M240i engine should not be overlooked, as it can signal serious underlying issues that require immediate attention. This sound often indicates a malfunctioning hydraulic valve lifter, a critical component that ensures the smooth operation of the engine's moving parts. If left unaddressed, the ticking could escalate into more severe problems, such as low engine oil levels or worn timing components, which can lead to costly repairs and diminished engine performance. Additionally, a loose lifter can exacerbate the ticking noise, potentially resulting in significant mechanical failures over time. Regular maintenance, including monitoring oil levels and using the correct engine oil, is essential to minimize friction and prevent such noises from occurring. By addressing the ticking noise promptly, you not only safeguard your engine's longevity but also ensure optimal performance and safety while driving your BMW M240i.

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BMW M240i Engine Ticking Noise: Causes & Repairs | RepairPal