- 1). Listen for the source location of any interior rattling noises while driving, as they are most likely to occur when going over bumps or uneven surfaces. Using the heel of your hand to lightly bang on the dash and various other plastic interior components is a good way to reproduce rattles. Most interior components are secured with plastic clip fasteners, though larger components may also be secured by Phillips-head screws. Ensure all plastic clips are secured, and tighten any interior screws to rid your Infiniti of unsoundly interior rattles.
- 2). Listen for exhaust rattling when accelerating your Infiniti. Since the exhaust system is exposed to the elements, it is common to incur exhaust damage over time from various road debris and general wear. Common sources for exhaust rattles are loose heat shields, which are bolted overtop of the exhaust piping at various points under the vehicle. Damaged exhaust hangers can also lead to exhaust system rattles. Tighten any loose bolts securing the exhaust heat shields and replace any portions of the exhaust with cracks or damaged hangers.
- 3). Ensure all of the flange bolts securing the various segments of exhaust piping are secure. On some Infiniti vehicles, this may require raising the vehicle with a floor jack and jack stands to access the exhaust bolts. Loose exhaust flange bolts can lead to exhaust leaks, which will create an unsoundly exhaust noise, as well as rob your Infiniti of performance. Exhaust bolts coming loose over time are common due to the extreme engine heat and vibration the exhaust system is subjected to under normal driving. Tighten any loose exhaust flange bolts throughout the exhaust system.
- 4). Remove the plastic air box cover in the engine bay, secured by metal clips. Inspect the air filter inside to ensure it is free of damage or collected debris. Replace the air filter if it is worn out to retain your Infiniti's horsepower and fuel mileage performance. Inspect any rubber lines throughout the engine bay, such as vacuum and radiator lines. Rubber lines are prone to breaking down under the extreme heat generated by the engine, leading to various performance and emissions issues. Replace any faulty lines with factory or universal units, available from most automotive parts retailers.
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