Changing seasons seem to always bring about fluctuations in fuel mileage for gasoline powered vehicles. While variations in ambient temperature may result in a slight difference in fuel mileage, changes in fuel composition between winter and summer blends is the key contributing factor. These different blends are also the reason that fuel prices always seem to go up in the warmer, summer months – and you thought fuel companies were just greedier during vacation season.
Considerable damage to the engine can be caused by simple programming issues in the PCM. Check out Auto Service Professional’s tech tip to learn more.
To understand pulse width modulation requires basic electrical understanding. In electric pumps, there are typically two settings – on and off. Simply put, a pump is on when it receives electrical power and it’s off when there is no power. When it’s on, it’s also known as 100% duty cycle.
In Part 1, we began to discuss the importance of oxygen sensor voltage codes. Voltage codes can be caused by sensors that are bad and stuck lean or rich. These codes can also be caused by lean or rich running conditions. The case studies we will focus on will look at pre-cat oxygen sensor codes, both caused by parts other than the O2 sensors.
The development of the automatic transmission is one of the most important milestones in the history of automobiles. The automatic transmission allowed for a much wider user base than had ever been dreamed of before.