Underhood

  • Diesel has gotten a bad rap mostly due to the filthy smoke the engines belched back in the 1970s and '80s. But all that has changed thanks to tighter emissions regulations and improved technology. Today, diesel creates more power, is cleaner and more
  • It was going to happen eventually; closed-loop combustion control has finally been introduced to the diesel world. Since the first electronically controlled diesel engines appeared in the mid-80s, diesels have been required to operate in an open-loop
  • Valve stem seal problems are as old as overhead valves. Those puffy brown rock-hard deposits (that can look kind of like brown ice cream) on the spark plugs aren't always so noticeable on some engine platforms with leaking stem seals, but they blatan
  • Battery management systems are simple in theory. Using a current monitor, only put as much current back into the battery as you take out. Instead of maintaining a constant 13.8 volts (V) or thereabouts, a battery management system checks the battery'
  • Engine need air, fuel and spark to start, and they must be correctly timed. But when either the crank position sensor or the cam position sensor is lost, the ECM may shut down ignition, injection or both. But codes typically set and extended cranking
  • The 3,000-mile oil and filter change; it's as much a part of the American car culture as hot rods, car hops and white wall tires. Most of us can count this maintenance as our first automotive service experience. Whether we performed it ourselves in t
  • A Lexus SC300 came into our shop once with an oil leak that we identified as a power steering pressure line leak. The owner later brought in his mother's 1996 Chevy Blazer to have its engine worked on. From that Blazer to oil leaks in Chevy trucks, t
  • In today's world of tightening environmental regulations, global warming alarmism and all the rest of it, everybody who lays a wrench on an A/C system should be certified to do so. Why? Well, one good reason is that it's a $32,000 fine if a governmen