I just recently purchased a Lincoln MKZ. It really is hard to miss on the road—the design is gorgeous! However, my power steering fluid never seems to be enough inside the reservoir and might be leaking. There is also a humming noise every time I steer the vehicle. What could be the source of this problem?
The power steering fluid leaking from the pump, hose, or the steering rack is caused by many factors. The noise that's been bothering you is a clear sign that the pump is not lubricated enough and the fluid in the reservoir is drying up. The fluid has a distinct smell, like burnt marshmallow. If you have noticed any of these symptoms, then you can conclude that your MKZ is suffering a power steering fluid leakage. In some cases, the leak is simply caused by the hoses that are not clamped tightly enough. Verify if this is the case and fix it. If the leakage comes from the steering rack, it is usually caused by worn-out rack end seals. If this is the cause, then the rack end seals must be replaced. If it does not come from the steering rack, do further checks to find out if it is the pump seal that needs replacement.
There is a delay in gear engagement every time I shift from one gear to another? What parts do I need to inspect in order to diagnose and solve this problem?
The Lincoln MKZ automatic transmission is controlled by a software in its Powertrain Control Module (PCM). When the mileage is still low, difficulty in shifting gears may be corrected by upgrading the software in the PCM. However, as the miles increase, it is more probable that internal damage has already occurred. It would involve repairing or replacing parts of the transmission system such as the valves. On the other hand, a delay in gear engagement may be caused by simpler concerns such as a dirty spark plug or damaged fuel pump. If you don't have time to spare for a thorough car check, it is still best if you bring your car to the local mechanic to verify the source of the problem.
The tires of my 2007 MKZ wear out so quickly. What can I do to improve the tire condition?
Besides their overall quality and construction, the lifespan of your tires also depends on the kind of terrain you frequently drive your MKZ on as well as on your driving habits. Asses your driving practices to know if they do contribute to the faster deterioration of the tires. Also make sure that you follow regular tire maintenance, which includes regularly rotating your tires and following the prescribed tire pressure. Every month, check the pressure of your tire, including that of the spare. Underinflated tires will cause wear on the sides and can lead to overheating in the tire itself, thus hastening tire wear. Over inflation puts the tires at risk for more damage, too as it allows the traction to decrease, causing wear in the center. Do not rely on the way your tires look because you will never know if the pressure is just right unless you have it checked. In general, a healthy tire pressure is roughly around 6 pounds per square inch of air pressure. Check the Lincoln MKZ manual to verify the tire pressure specs for your particular make and model. Keep in mind that tires lose approximately 1 pound per square inch of air pressure per month. So if you miss checking the pressure in 6 months, the tires will surely be underinflated by then.