Point of No Return: Returnless Fuel Injection Systems
If you’ve tried to find the fuel pressure regulator on many late-model engines by looking in the engine compartment, you won’t find it there because the regulator has been relocated to the fuel tank.
Tech Tip: Brake Lathes Continue to be a Profit Center for Busy Shops
A brake lathe has long been an indispensable piece of equipment for shops that do brake work. A bench lathe is necessary to resurface rotors and drums. An on-car lathe is also a great tool for turning troublesome rotors on vehicles that are sensitive to rotor runout issues, and those with captured rotors. But with cheap offshore rotors flooding the aftermarket, and some new cars now being equipped with lightweight rotors that are too thin to turn, you may be questioning the need for a brake lathe ….
OBD II Engine Diagnostics: Not as Simple as it Seems
Anybody can plug a scan tool into a vehicle and read codes. But do they know what the codes mean, how to diagnose the fault or, most importantly, how to fix the vehicle? The problem with reading OBD II codes is that the code tells you only that a fault has occurred. It does not
Carley’s Corner: Highlights of the AAPEX & SEMA Shows
Every year in early November, Las Vegas hosts two huge automotive shows, the Automotive Aftermarket Products Exposition (AAPEX) at the Sands Convention Center, and the Specialty Equipment Manufacturers Association (SEMA) show at the Las Vegas Convention Center. The two shows this year drew more than 100,000 attendees from all over the world. These are the
Timing Tools
Before you replace a timing belt, chain or gear set on some engines, you will have to look up the timing reference marks. Some engines have multiple timing marks that can cause confusion if you don’t know which ones to use or how to line them up. Many engines also require special tools when changing
Tech Feature: Diagnosing Fuel Pumps and Injectors
One of the first questions that should always be answered when diagnosing a fuel-related complaint on a fuel-injected engine is, “What is the fuel pressure?” All too often, technicians assume fuel pressure is “good” without actually measuring it with a gauge. If the engine runs, they assume the injectors are getting adequate fuel pressure. If
Mode $06 Diagnostic Update
Mode $06 has been around since the introduction of second-generation onboard diagnostic (OBD II) systems back in the mid-1990s. Essentially, Mode $06 is the raw test data the OBD II system uses to evaluate the operating status of various components in the engine management and emission control systems
Diagnosing Wheel Speed Sensors: WSS, ABS Systems
Some vehicles even compare the wheel speed sensor readings against the vehicle speed sensor (VSS) to make sure all of these sensors are accurate and working correctly.
Brake Fluid Testing: Bleeding and Flushing Minimizes Internal Corrosion in the Brake System
Brake fluid is something that should always be changed when the brakes are relined or when replacing a caliper, wheel cylinder, brake line, hose or master cylinder. But what about at other times? Should brake fluid be replaced for preventive maintenance? Most brake experts say yes! DOT 3 and DOT 4 brake fluid contains glycol
Diagnosing Intermittent Stalling Issues
Intermittent driveability problems of any kind are always a challenge to diagnose. When a customer brings you a vehicle and complains of a stalling problem, you may not have much to go on other than their description of what’s happening and when it happens. The more information you can get out of them the better,
Cooling System Antifreeze Requirements
When a customer brings you a vehicle that needs a coolant change, what kind of coolant should you use? The type of coolant specified by the vehicle manufacturer? A universal or “all makes, all models” type of coolant? Or should you run the old coolant through a recycling machine and put it back in the
The Ins and Outs of Indirect and Direct TPMS
This is the year of the TPMS (Tire Pressure Monitor System). It’s been coming for some time. In response to a rash of highly publicized rollover accidents caused by tire failures on SUVs, Congress passed a law called the TREAD Act in 2000 which required all vehicle manufacturers to have TPMS on all their cars