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Diagnostic Solutions: Exhaust Restriction Diagnosis
By Gary Goms
March 19, 2012
Shops have been dealing with loss-of-power complaints caused by exhaust restriction since catalytic converters were popularly introduced in 1974.
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When to Replace Sensors and Why
By Larry Carley
March 15, 2012
Sensors are the nerve endings of the engine management system. They provide the inputs the Powertrain Control Module needs to make critical control decisions. Sensors are designed to last the life of the vehicle or until they wear out, become contaminated or fail.
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Oxygen Sensors are Key to Performance and Fuel Economy
By Larry Carley
May 20, 2011
The oxygen (O2) sensor is part of the fuel management system. It monitors unburned oxygen in the exhaust. The powertrain control module (PCM) uses this information to determine if the fuel mixture is rich (too much fuel) or lean (not enough fuel). ...
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Troubleshooting Wideband O2 Sensors
By Larry Carley
May 6, 2011
With fuel prices rising, the need for accurate air/fuel mixture monitoring is more important than ever. The engine computer needs to know what the fuel mixture is with a high degree of precision so it can optimize fuel economy as well as emissions. I...
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Fuel System Definitions and Diagnostic Trouble Codes
By Carlton Banks
May 6, 2011
Many modern-day fuel systems offer a new look into system status definitions. It's become very important to extend our understanding well beyond the concepts of simple "open loop" and "closed loop" status. Here we will explore the...
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Muffler Replacements Are a Fast, Easy Way to Boost Profits
By Gary Goms
May 1, 2011
Have muffler inspections become a low-priority undercar service in your shop? With the introduction of stainless-steel exhaust systems into the import market, it's easy to forget that muffler and related exhaust parts sales are still a lucrative serv...
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Performance Exhaust Upgrades Demand Attention to Detail
By Gary Goms
May 1, 2011
Depending upon the market to which a tire dealer might be catering, the term "performance exhaust" can have different meanings.
The first market actively seeks out the throaty rumble and chrome-plated look as part of the"v...
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Replacing Kia's Catalytic Converter After Finding DTC P0422
May 1, 2011
Kia's OBD II engine management systems use dual oxygen sensors, which among other things allow monitoring of the efficiency of the Manifold Catalytic Converter (MCC), also referred to as the "warmup" cat.
...
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The Role of Oxygen Sensors and When They Need Service
By Gene Markel
May 1, 2011
Is there a mileage or time requirement for oxygen sensor replacement? Simple answer: No.
Oxygen sensors were first used for fuel trim and emissions in the late 1970s and into the mid-1990s. A single sensor was installed into the exhaus...
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Entries are now being accepted for the
2012 Top Shop Award Program.
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