1990 BMW 735i Engine Makes A Ticking Noise

Diagnosing the Causes of Ticking Noises in Your 1990 BMW 735i Engine and Recommended Solutions

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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 1990 BMW 735i 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 1990 BMW 735i 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.

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.

What are the initial diagnostic steps to take for a ticking noise in a 1990 BMW 735i engine?

When faced with a ticking noise in your 1990 BMW 735i engine, it's essential to adopt a methodical diagnostic approach to identify the root cause effectively. Start by checking the oil levels, as insufficient oil can lead to increased friction and noise, potentially causing severe engine damage. Next, inspect the timing belt tensioner; a failing tensioner may produce a ticking sound that varies with engine temperature, indicating a need for replacement. Additionally, examine the propshaft center support bearing, as a worn bearing can create vibrations and thumping noises that may be mistaken for engine issues. Don't overlook the heat shield; loose or damaged shields can rattle and contribute to unwanted sounds while driving. It's also crucial to check for any signs of engine misfire, which can manifest as popping noises, particularly during acceleration or deceleration. Lastly, consider the possibility of timing chain problems, as older BMW models are prone to such issues, and any rattling noises should be investigated promptly. By following these steps, you can systematically narrow down the source of the ticking noise and take the necessary actions to resolve it.

What are the common causes of a ticking noise in the engine of a 1990 BMW 735i?

When encountering a ticking noise in the engine of a 1990 BMW 735i, it's crucial to consider several common problems that could be at play. One of the primary culprits is low engine oil level or pressure, which can lead to inadequate lubrication of engine components, resulting in a distinct ticking sound. Regularly checking and maintaining the proper oil level is essential for engine health. Another frequent issue is related to the variable valve timing system, known as VANOS, which can produce rattle noises if it malfunctions. This system is integral to the engine's performance, and any irregularities should be addressed promptly. Additionally, problems with the camshaft and follower can contribute to ticking noises, as wear and tear on these components can disrupt their normal operation. By systematically investigating these areas, DIY enthusiasts can effectively diagnose and potentially resolve the ticking noise, ensuring the longevity and performance of their BMW 735i.

How urgent is it to address the ticking noise in the engine of a 1990 BMW 735i?

Addressing the ticking noise in the engine of a 1990 BMW 735i is not just a matter of convenience; it is a critical step in maintaining the vehicle's health and performance. Ignoring this rhythmic sound can lead to severe engine damage, as it often indicates underlying issues with vital components such as the camshaft and follower. These parts are essential for the engine's operation, and if they are malfunctioning, the risk of catastrophic failure increases significantly. For DIY enthusiasts, it is crucial to recognize that what may seem like a minor annoyance could escalate into costly repairs if left unchecked. By investigating the source of the ticking noise promptly, you can prevent further complications and ensure the longevity of your BMW. Taking immediate action not only safeguards your investment but also enhances your driving experience, making it imperative to address any unusual engine sounds without delay.

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