Diagnostic Dilemmas: Playing the Diagnostic Shell Game
More often than not, deciphering diagnostic trouble codes is like playing a high-tech version of the old circus sideshow “shell” game. In the trouble code shell game, we are led to believe that the pea (diagnostic solution) is hidden under one of the shells (DTCs) stored in the diagnostic memory. Unfortunately for the diagnostic technician,
Carburetor Repairs & Recalibrations
As a follow-up to “Dusting Off Fuel System Fossils” in April’s edition of Underhood Service, I will share many driveability concerns and emissions failures that I’ve repaired by rebuilding, and sometimes modifying, certain carb circuits. But before diving into a carburetor rebuild or recalibration, be certain that you understand the system you’re working on, including
Getting “Tuned” Into Exhaust System Service Opportunities
Although stainless steel exhaust systems have reduced the number of exhaust system replacements, it’s important to remember that regular exhaust system inspections remain an integral part of import service. When inspecting an exhaust system, remember that the exhaust pipe and muffler must: Help “tune” the engine for peak performance; Reduce noise to legal levels; Meet
OBD II Diagnostics:Tips And Tricks to Make the Process Easier
The Malfunction Indicator Lamp (MIL) can be a golden light of opportunity for your shop. If the light comes on, it means the Onboard Diagnostics II system (OBD II) has detected an emissions-related problem. OBD II is designed to turn on the MIL if a problem occurs that may cause emissions to exceed federal limits
Matching Your Techs with the Right Job
Just a single decade ago, many industry experts speculated that 80% of the workflow passing through an independent repair shop would involve some type of high-level diagnostic process. Today, it’s obvious that, with the infusion of electronic operating systems, high-level diagnostics is now approaching that level of total workflow. Nevertheless, many others continue to ridicule
Spark Plug Technology
Spark plugs have been around almost as long as the internal combustion engine. In 1902, spark plugs were first used with a high voltage magneto to provide reliable ignition. For the next 70 years, spark plugs were a high maintenance item thanks to tetraethyl lead, which was used as an octane-boosting additive in gasoline. Unfortunately,
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
Rev Up Volvo Performance
When any engine swap is done using a larger displacement engine, you have to look at the big picture. Everything around it must be addressed to handle the added horsepower. This includes the braking system, front and rear suspension, and the structure of the frame. When I did my first Volvo V8 engine swap, it
Secondary Ignition System Maintenance
As one might expect, the introduction of low-maintenance ignition systems has changed how we sell and service secondary ignition system parts for import vehicles. Most import nameplates have, for example, replaced conventional distributor ignition systems with distributorless or coil-on-plug (COP) ignitions in order to reduce the number of wearing parts in the secondary or high-voltage
The New Oil Change
The basics of an oil change are still the same even after 80 years. The service typically involves draining the oil, replacing the filter and pouring in fresh oil. But in the past 20 years, the oil change has evolved, and to do it right requires extra steps and more information. The main changes to
