Q: Master cylinder valve leaking - why? 2011 Kia Sophia

Tire rotation is an important part of keeping your vehicle running well. Rotating the tires prolongs the lifespan of the tires, and also gives your vehicle a smoother, more consistent ride. The tires should be rotated by a professional roughly...

Hey there, thanks for writing in about your 1998 Lincoln Mark VIII. I suggest that the wiring circuit of the taillights are inspected by a technician for shorts. There may be a short to power/ground from faulted wiring or incorrect...

You may have a bad door latch and they are not serviceable. You will have to replace the latch and the lock actuator if it is not an integral part of the latch. If you would like to have this...

If the engine is vibrating (as opposed to the drive train axles, wheels, etc.) that points to an "engine management" problem. This includes a cylinder compression imbalance (variance in compression pressure) or an ignition, fuel system or air induction problem....

Hi there: When you use an additive to clear up a problem and it works, it's typically an indication of a dirty fuel injector or throttle body issue as opposed to other mechanical component issues. An additive has cleaning chemicals...

The Electronic Spark Control module (https://www.yourmechanic.com/services/electronic-spark-control-replacement) controls the ignition timing keeping the ignition cycle smooth as the various demands of the engine change depending on driving conditions. The compression in a given cylinder is created by tight clearances in the...

Hi there - the lack of heat (https://www.yourmechanic.com/question/heater-not-working-reliably-is-it-caused-by-a-bad-thermostat-by-thomas-c) from your HVAC system could be a couple of things: bad thermostat, heater control valve, or air in the cooling system. If the engine come up to proper temperature and stays there...

When the vehicle goes into limp mode when the engine misfires, the computer is shutting down the electronics to the transmission to prevent damage to the catalytic converter as the fuel condition is either too lean or too rich. Check...

In spite of the mileage, it may be repairable without rebuilding or replacing the transmission. I have a 2005 Jetta with the same transmission outside that experienced similar issues. Shifted hard on the 1-2 upshift and the 2-1 downshift. The...