Emissions Roanoke VA
Are you concerned about the emissions coming from your car? If you are and you want to know more about how to address this issue, read on for information on emissions and car repairs.
Catalytic converters have been disappearing at an alarming rate. The theft of these emission control devices is being perpetrated by sleazeballs looking for easy money. A thief can hock a pilfered converter for $25 to as much as $100 depending on the value of the precious metals inside it. Lately, the theft rate has been rising in direct proportion to the price of platinum and palladium, both of which are precious metals more valuable than gold.
Exhaust gas recirculation (EGR) can control combustion temperature to prevent spark knock as well as control NOx emissions. These systems were trouble-free and required service only if you were dealing with a spark knock issue, or if the valve opened too early, resulting in a tip-in acceleration stumble, or the more common, bad idle quality caused by the valve not closing completely at idle.
There are several ways to lower the combustion chamber temps. Enrichening the fuel mixture, lowering the compression ratio, retarding the ignition timing, lowering the overall temperature of the engine, and reducing the amount of pure air can each lower the temperature in the cylinders.
A WRAF sensor can measure mixtures that range from extremely rich to extremely lean (even straight air!). This ability allows the PCM to control fuel mixtures much more precisely, to handle much leaner fuel mixtures, to reduce emissions and to improve fuel economy compared to ordinary switching O2 sensors.
Fuel is refined to higher standards and engines run much cleaner, which means that an oxygen sensor replacement is needed only when an OBD II system detects degradation in oxygen sensor performance. When degradation is detected, the PCM turns on the MIL to warn the driver and to indicate to the technician that an oxygen sensor-related diagnostic trouble code has been stored in the PCM's diagnostic memory.
Though pistons can often be salvaged when rebuilding or remanufacturing an engine, sometimes they have to be replaced. The original pistons may have worn or damaged ring grooves, wrist pins or skirts, or they may have cracks. New pistons may also be necessary if the cylinders have too much taper wear and the block has to be bored to oversize. Or, maybe you just don't want to reuse the original pistons if you're building a performance engine or a high load engine like a diesel light-duty pickup truck.