Larry Carley, Author at UnderhoodService - Page 33 of 33
A/C Update

Once a year the Mobile Air Conditioning Society (MACS) hosts a trade show for A/C shop owners and technicians. This year’s event was held in Orlando, FL, January 22-24, and provided a wealth of service information to those who attended the technical sessions. For those who could not be there, we pass along some of

Aftermarket Update

Trade Press Gets First-Hand Look During Tour of Bosch’s State-of-the-Art South Carolina O2 Sensor Plant Oxygen sensors are one of the key sensors in every engine’s fuel management feedback control system. Consequently, O2 sensors play a vital role in maintaining low emissions, good fuel economy and peak performance. Developed by the Robert Bosch Corporation, O2

Transmissions & Clutches

The Ins and Outs of Manual Gear Box Repair

Understanding Today’s Multi-Coil Ignition Systems

Distributorless Ignition Systems (DIS) have been around for more than two decades, but in recent years the trend has been to multi-coil systems such as Coil On Plug (COP) or Coil Per Cylinder (CPC) ignition systems, and Coil Near Plug (CNP) ignition systems. COP systems have become the hot setup for a number of packaging,

Choosing Brake Friction Materials

The possibilities seem almost endless…

Flash Reprogramming

Would you believe flash reprogrammable PCMs have been in vehicles for more than a decade? The first such application was the 1990 Geo Storm. Why a humdrum car like the Storm would be the first to receive a flash reprogrammable computer system is unknown. You’d think GM would have chosen a more high profile vehicle

Sensing an Emissions Problem

Oxygen sensors are a product that have been around for more than 20 years, yet most motorists don’t even know they have one or more of these devices on their vehicle – let alone what it does. The only time customers even become aware of oxygen sensor existence is if they get a Check Engine

Analyzing Ignition Misfires and Plotting a Diagnostic Course

Uh oh. The Malfunction Indicator Lamp (MIL) is on, and you’ve just found a misfire code. It’s a code P0304, which tells you cylinder number four is misfiring. There are no other codes and the engine has a steady miss. Now what? Misfire diagnosis in this kind of situation should be fairly easy. You have

Cooling Off: Cooling System Parts and Service

Cooling system service is an absolute “must-do” on any import nameplate. Once a cooling system suffers long-term neglect, it turns into an on-going source of problems for the owner and his servicing technician because, when corrosion starts to take place, the effects can’t be reversed. For that single reason, it’s important to sell your customers