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Archive Tag: active fuel

Oil Consumption: It May Be a Normal Characteristic

Oil Consumption: It May Be a Normal Characteristic

September 12, 2023

When dealing with oil consumption complaints, how much should be considered as too excessive? Is the engine consuming an excessive amount of oil or should the amount consumed be considered a normal characteristic? This is especially a concern with the extended service intervals, which may result in the vehicle being driven twice the mileage when […]

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TURBOCHARGED ENGINES: Are You Recommending the Required Services?

TURBOCHARGED ENGINES: Are You Recommending the Required Services?

July 20, 2023

Turbocharged engines are becoming commonplace as the vehicle manufacturers are utilizing smaller displacement engines fitted with turbochargers. Turbochargers and direct fuel injection can make a smaller displacement engine behave like a larger displacement engine, while accomplishing better fuel economy. With this technology comes some challenges, especially in the area of required maintenance. Failure to provide […]

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DIAGNOSING PERFORMANCE COMPLAINTS: The Process Can Be a Challenging Event

DIAGNOSING PERFORMANCE COMPLAINTS: The Process Can Be a Challenging Event

February 16, 2023

Troubleshooting today’s technology can be challenging for even the most experienced technician. Making an accurate diagnosis, rather than throwing a lot of expensive parts and labor at the symptom can be a challenge. How would your shop handle the following customer complaints? a) Crank but no-start b) Hard starts c) Long crank time d) Misfire […]

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A Difficult Diagnosis: When Multiple Conditions Create Similar Symptoms

A Difficult Diagnosis: When Multiple Conditions Create Similar Symptoms

July 21, 2022

Customer complaints of rough idle, misfires, crank but no start or long crank time symptoms can be a challenge with today’s technology. Random or multiple misfire codes may be stored in memory. Symptoms that seem like an ignition related issue may actually be fuel related, carbon induced, or in some cases a normal characteristic. Fuel […]

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Low Oil Pressure Warning: A System Clean-Up May Be the Cure

Low Oil Pressure Warning: A System Clean-Up May Be the Cure

October 20, 2021

His quiet morning drive to work in his 2013 Silverado was interrupted by chimes and a Stop Engine Low Oil Pressure Warning. That can be a scary event, as major engine damage can result due to lack of lubrication. These symptoms have become a common occurrence for GM vehicles equipped with Active Fuel Management. When […]

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GM’s Active Fuel Management: Diagnosing Low Oil Pressure Symptoms

GM’s Active Fuel Management: Diagnosing Low Oil Pressure Symptoms

August 13, 2021

Symptoms of a low oil pressure condition have become a common complaint on GM vehicles equipped with active fuel management, sometimes referred to as displacement on demand. The symptoms may be the result of one of two malfunctioning pressure regulating valves or from a restriction in a filter screen positioned beneath the oil pressure sensor. […]

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