Troubleshooting MIL Issues: OBD II & “CAN” Scan Tool Diagnostics
The Malfunction Indicator Lamp (MIL) is one of the most misunderstood warning lights on vehicles today. Most motorists have no idea what the light means or why it’s on. Some think the MIL light is an oil change reminder light. Others realize something must be amiss to cause the light to come on, but don’t
Wheel Balancing: Making a Smart Investment in a Wheel Balancer
When you consider that only 1/4-ounce of wheel imbalance can produce a noticeable vibration on a vehicle, it’s easy to understand why it’s so important to have a wheel balancer that is both accurate and easy to use. Many balancers in today’s marketplace are capable of balancing a wheel to within a few hundredths of
Battery Charging: All Charged Up!
A battery charger is something every shop should own, and most do. But battery technology has changed in recent years. Battery chargers that were designed for older conventional lead acid batteries (called “flooded” cell batteries because the cells are filled with liquid electrolyte) may not be the best choice for newer batteries with absorbent glass
Tire Tech
Coupled Forces Why using less weight is not a shortcut In our July issue on page 26, the article titled “Less Weight, Great Balance” (or at www.brakeandfrontend.com) answered a lot of questions, but it also brought up some new ones. The article was on the new technology that many new balancers are featuring that can
High-Performance Brake Pads
Friction and Fiction “I would like a more aggressive or high-performance brake pad.” If you work at a typical shop you will hear this statement at least once a week. It is a complex request that requires a line of questioning to flush out what the customer wants, needs and expects. “Aggressive”, “high performance” and
Fundamentals of Electrical System Diagnosis
Electrical principles, like voltage, amperage and resistance, can be described as cars passing along the roadway. Voltage would be the vehicle’s speed, amperage would be the number of vehicles on the road at the same time, and resistance would be the potholes in the road’s surface. Basically, electricity is a supply of atoms with an
Ignition Misfires
A flashing Check Engine light and a P0301 to P0312 diagnostic trouble code is a sure-fire indication that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels rough, lacks power and uses more gas than usual. Sometimes a misfire may feel
A/C Update: Bad A/C Blowers & Fuses
One component air conditioners and heaters share in common is the blower motor. The blower motor is usually located in the Heating, Ventilation and Air Conditioning (HVAC) housing under the dash. The blower motor spins a squirrel cage fan that delivers both cold and hot air. If the driver wants cold air and turns on
Diagnostics Through CAN Networks
Since model year 2003, a growing number of domestic and import vehicles have been built with a new onboard communications protocol called CAN (Controller Area Network). CAN is essentially an engineering standard for how computers and modules talk to one another via the serial data bus in a vehicle’s wiring system. It’s a high speed
Selling Services: Anti-Seize & Studs
Last month I received a great letter from one of our readers. He was absolutely livid about the story “Double Hit” in our February issue. Ed from the Cherokee Garage in Beckwourth, CA, pointed out several incorrect items in the article. In the article, it was advised that a light coating of anti-seize could be
Slotted and Drilled Rotors: Show or Slow?
You’ve seen them on the race track. You’ve seen them on the street. You’ve seen them in speed shops, in magazine ads, online and probably on eBay, too. The product we’re talking about is slotted and/or cross-drilled high performance brake rotors. They look great, no doubt about it. Performance rotors are an excellent upgrade for
Tech Feature: Solving Intermittent Electrical Problems
Intermittent electrical faults are the bane of the auto repair business. If an electrical component has failed, or there is an open or a short in a circuit, you can usually find it fairly quickly because it isn’t hiding from you. It’s a persistent fault that can be isolated by a systematic process of elimination.