Category: Emissions

Image of a CT6 five-link rear suspension
05 Sep

Car Suspension Systems Explained

One of the most overlooked systems on a vehicle is the chassis and suspension system. The chassis provides the structure that ties the suspension and steering components to the vehicle. The proper function of the chassis systems provides the driver with comfort, safety, and driving performance. Chassis systems have evolved to balance the requirements of […]

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Image of an oxygen sensor and air fuel ratio sensors
05 Aug

The Role of Oxygen Sensors in Engine Performance

With the increased concern for energy conservation and cleaner air, better control of the engine combustion process became necessary. Now, Oxygen Sensors are used in all internal combustion engine fuel control systems. What Do These Sensors Do? The Oxygen Sensor is used to adjust and maintain desired engine air/fuel mixtures to better control exhaust emissions […]

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Image of pistols with gasoline and diesel fuel at a car gas station
07 Jul

Diesel Emissions of Passenger Cars

With many of the worlds largest car manufacturers in the eyesight of regulators for their misleading published emissions output figures, we would like to share some information about the topic. Presently, the main driving standard for emissions output by vehicle powertrains are the US EPA Tier 2 and California LEV-II ULEV regulations. In 1999, the […]

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damage catalytic converter
09 Jan

What Damages a Catalytic Converter?

Engine misfires that are not repaired in a timely manner are the number one reason for damaged catalytic converters. The damaging conditions created by a misfiring cylinder of the engine can reduce the useful life of the vehicle’s catalytic converter by years or, even worse, meltdown the converter. What is a Catalytic Converter? A catalytic […]

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Check Engine light hollenshades
28 Sep

Is Your Check Engine Light On? What Does it Mean?

Few things can ruin a day faster than an unexpected car crisis. You’re driving to work, on your way to dinner with friends or taking the kids to soccer practice when something on your dashboard catches your eye: a warning light. It might appear as a glowing orange engine symbol, or as bold, intimidating type: […]

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Engine Maintainence image on Hollenshade's website
10 Feb

Failed Emissions Test

There are many reasons that can lead to a car failing the state mandated emissions test. FUEL SYSTEM PRESSURE SENSOR AND FILLER NECK GAS CAPPURGE AND VENT VALVE MISFIRE INTAKE LEAK  

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