It seems like your car's brake pedal is hard to press in the morning when starting the engine, but it becomes lighter after the engine is on. This issue didn't exist before, and you're wondering if it's due to a vacuum pump leak. The dealership mentioned it doesn't affect driving. What should you do?

The check engine light is on for your 2010 Mazda3 hatchback, and the fault code indicates that the fuel trim system is too lean after the catalytic converter. Here's what you can do: 1. **Check for Vacuum Leaks**: Inspect hoses and connections for any leaks that might be causing the issue. 2. **Inspect the Oxygen Sensors**: A faulty oxygen sensor can lead to incorrect fuel mixture readings and should be checked. 3. **Examine the MAF Sensor**: The Mass Air Flow sensor might be dirty or malfunctioning, affecting the air-fuel ratio. 4. **Look at the Fuel System**: Check the fuel injectors and fuel pressure to ensure they are functioning properly. 5. **Check the Catalytic Converter**: Although less common, a failing catalytic converter can cause similar issues. 6. **Professional Diagnosis**: If you're unable to identify the problem, it may be best to consult a professional mechanic for a thorough diagnosis. Remember, addressing the issue promptly can prevent further engine damage.

When coming to a stop, the idle speed suddenly drops and it feels like the car is about to stall. This occasionally happens when shifting from D to P while stationary. I've replaced the spark plugs, ignition coils, injectors, high-pressure fuel pump, PCV valve, carbon canister solenoid, air flow sensor, and engine mounts. I've also cleaned the intake carbon deposits and combustion chamber carbon deposits. The problem still exists. Can anyone help me figure this out? [crying][crying][crying][crying]

It seems like your car's brake pedal is hard to press in the morning when starting the engine, but it becomes lighter after the engine is on. This issue didn't exist before, and you're wondering if it's due to a vacuum pump leak. The dealership mentioned it doesn't affect driving. What should you do?

The message "Reduced Engine Performance" on your car usually indicates there's a problem that needs attention. This could be due to several reasons, such as issues with the fuel system, air intake, or engine sensors. The fact that the car stalls at low speeds suggests it might be a problem affecting the engine's idle function or fuel delivery. It would be best to have it diagnosed by a professional to pinpoint the exact cause.

I have a 2016 S5 manual, and recently the engine noise has become quite loud, with a rattling sound. The mechanic said the tensioner bearing is broken. When I'm driving and press the accelerator, there's a ticking sound that gets faster the more I press it, but it stops when I release the pedal. Does anyone know what might be happening...?

The 2023 standard version Rubicon has an issue where if it's left for two nights, the brake pedal becomes very hard in the morning when I press it to start the car. I'm wondering if anyone else has experienced this issue with their Jeep. I went to the 4S dealership, and they checked the vacuum pressure, which was at 620 and held for a morning without any signs of leakage. Is using a smoke machine the only way to check it? Sigh 😮‍💨

Hello everyone! I bought a Jeep Compass in 2017. The dealership initially said this car requires 95 octane fuel, and I've been using it since 2017. However, when I drive, there's a jerking sensation when I decelerate and then accelerate again. Also, when I turn on the air conditioning, the engine noise becomes particularly loud. My car has less than 30,000 kilometers and I mainly use it for commuting. Recently, I tried using 92 octane fuel, but I found that the power was insufficient. When I tried to overtake, the car wouldn't accelerate, unlike when using 95 octane. So, I'm wondering, what fuel do you all use? Which type is better for the car?

I'm driving a 2017 model 1.4T automatic 2WD luxury version. Last year, I replaced the recalled vacuum pump. When I used to drive it daily, I didn't notice any issues. Recently, I've been using the car less, and after it's been parked for a day or two, the brakes feel hard when I start it in the morning. I wanted to check if the vacuum is sufficient, so I tried coasting in neutral and after pressing the brakes a couple of times, they become hard. I want to ask fellow car owners if they've experienced the same situation. Thanks.