Q: Hi Tien's,i am thinking about getting a bmw 740i.

Hello. It sounds like the key or the ignition switch could be having contact issues. There are contacts inside the ignition switch. To eliminate a worn key resistor, try another key and see if you have the same result. If...

The belt tensioner or pulley will need to be checked along with the belt's condition. The belt may just need to be adjusted. I recommend having a certified mechanic, like one from YourMechanic, come and test your vehicle for you....

This is a problem that may not be able to be fixed. The noise is from the brake pad material metal (https://www.yourmechanic.com/article/why-do-brakes-squeal) in the pads squeaking on the rotors when you go in the opposite direction of the pad's normal...

If you say there is an "alarming" sound when it starts, then I would only suggest you have a proper diagnosis done. By doing so you'll be able to find the cause before you try and run it any more....

This is correct. If your car's starter was failing, it would not be able to be jump started since the power from being jump started is still eventually sent to the starter via jumper cables rather than your car's own...

German luxury cars built in this century are very complicated. They have multiple electronic control units for different functions, one for the engine, one for the transmission, one for the brakes and half a dozen more for various body functions....

Hello. Transmission shifting problems can be caused by a wide variety of issues. A few common causes are issues with the fluid, torque converter. Automatic transmission operate using fluid pressure. If the transmission fluid is dirty or contaminated, or the...

Hi there - good plan for diagnosis, isolate the motion that is causing the symptom! The noise could be an alternator bearing, or the serpentine belt idler or tensioner pulley bearing (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-idler-pulley). These make noise that is proportional with engine...

Any removal technique has to ensure no valve fragments fall into the area under the valve cover. Either an appropriate tool has to be threaded into the remainder to pull the valve fragment up and out or you have to...