I've been having driving problems in the past couple of weeks, and my mechanic is now telling me that the problems I'm experiencing are caused by running rich. Can you tell me what this means, and how do I correct the problem?

During the combustion process, the engine generates power using two crucial elements—air and fuel. For combustion to happen properly, the engine must receive the correct amount of fuel for a specific amount of air. The correct ratio is 14.7:1 air to fuel. When there's too much fuel compared to air in the engine, this is called ‘running rich'; the opposite is called ‘running lean'. The former can happen because of a wide range of reasons. When the air filter is clogged, this will keep air from flowing properly to the engine. Similarly, when there's too much fuel pressure in the system or one of the injectors is leaking, more fuel will reach the engine. These scenarios are examples of running rich, and they now cause the problems you are experiencing in your ride. Correct the problem by addressing the main issue that's causing it.

I bought a set of window visors last week, the type that you just stick to the windows using the tape that comes with them. I tried to install and attach one of the visors the other day, but it won't stick to the surface no matter what I do. Is there any trick to making these things stick and hold onto their mounting location?

The most probable reason the window visor won't stick is that the surface you're sticking it to is a bit dirty; it probably has small debris that keep the visor from being properly attached. What you can do is to clean the said surface and ensure that no debris or dust is left. You can use isopropyl alcohol for cleaning. If the tape that comes with it doesn't work, you can get a 3M automotive double-sided tape and use it to attach the visor to the window.

I am about to replace the brake pads in my Eagle Vision because they had gone too thin. I was alerted to the problem by a squealing sound when braking, which turned out to be the brake sensor warning me about the situation. My question is this: do I really need to replace the brake sensor now because it's already sort of spent? Please advise.

Yes, it is advised that you get a new sensor together with the new brake pad set and that you replace the old sensor when you install the new pads. This sensor is mounted on the pads, and there are cases when you might notice the thinning pad even if the sensor hasn't released any sign of need to replace the pads. In a case like this, you may reuse the old pads. However, if the pad has been used, then it's advised that you discard it and install a new one together with the new pads. This will guarantee that the sensor is always up to par when it comes to keeping you aware when the pads already need changing.

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