Why is my Challenger's exhaust vibrating?

Understanding Exhaust Vibration in a 2023 Dodge Challenger R/T

If you recently purchased a 2023 Dodge Challenger R/T equipped with a 5.7-liter Hemi engine and have noticed a vibration from the exhaust when driving at a steady speed between 40-50 miles per hour, it may be due to the dual-chamber exhaust system. In normal mode, the exhaust is slightly restricted, which can lead to minor vibrations. Switching to sport mode typically reduces this restriction, resulting in a smoother experience.

In addition, sport mode adjusts the shift points of the transmission, which could contribute to the feeling of vibration. This combination of factors is considered normal for vehicles with dual-chamber exhaust systems. If the vibration persists or becomes more pronounced, it may be worth consulting a mechanic to ensure there are no underlying issues.

Dealing with Service Concerns in a 2012 Toyota Camry SE

For owners of older vehicles, such as a 2012 Toyota Camry SE with 43,000 miles, it's not uncommon to feel overlooked by dealerships, especially if parts are less readily available. While Toyota dealerships typically offer reliable service, independent shops can also provide quality repairs. Many AAA-approved shops are capable of delivering similar service levels without the need for dealership visits.

It's important to maintain trust in your vehicle's maintenance, even if you begin using an independent shop. Always ensure that any repairs or services are documented properly and that you receive clear communication about what is being done.

Troubleshooting Noise and Infotainment Issues in a 2021 Mazda CX-5

If your 2021 Mazda CX-5 produces a high-pitched cricket-like noise from the right side when you first turn on the heat, it may be related to the climate control system. The noise often disappears after a few minutes, which suggests the issue could be with the temperature blend door motor. This component might be failing or sticking, causing the sound during operation.

Regarding the infotainment screen going blank, many Mazda models have experienced similar issues, particularly with the touch screen. A class-action lawsuit was filed against Mazda for these problems in certain model years, and while the issue may have been resolved in newer models, it’s still worth monitoring. If the problem continues, consider visiting a certified technician for further inspection.

Fuel Recommendations for a 2020 Mercedes GLE 350

If you own a 2020 Mercedes GLE 350 with a four-cylinder turbocharged engine and have been using 87 octane gasoline since purchase, it's essential to check the owner’s manual. Mercedes recommends 91 octane for maximum performance and fuel economy, but if you're satisfied with your current gas mileage and performance, continuing with 87 octane is acceptable.

However, it's important to avoid using gasoline with less than 87 octane, as it can damage the engine. Additionally, Mercedes prohibits the use of fuels with more than 10% ethanol, such as E15. Regarding fuel additives, using something like Chevron Techron once or twice a year is generally safe and can help maintain engine cleanliness.

EV Charging Tips and Battery Longevity

When it comes to electric vehicle (EV) charging, it's crucial to follow manufacturer guidelines to preserve battery life. For example, Volvo recommends charging to 90%, while Hyundai limits charging to 95.6%. Fully charging an EV battery to 100% can reduce its long-term lifespan, so it's best to charge to 80-90% for daily use.

In cold weather, some manufacturers suggest charging to 100% but advise driving the car soon after to prevent the battery from sitting at full charge for extended periods. Always refer to the owner’s manual for specific recommendations.

About the Car Doctor

John Paul, known as the Car Doctor, has over 40 years of experience in the automotive industry and is an ASE-certified master technician. He provides expert advice on a wide range of vehicle-related questions. If you have any car-related queries, you can email him at jpaul@aaanortheast.com or listen to his podcast at johnfpaul.podbean.com.

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