المشاركة الأصلية كتبت بواسطة tasaka
اسباب تلف علبه البيئه
- استعمال بنزين به رصاص ( بنزين 80 ) .. الرصاص يكون غلاف عازل على مكونات علبه البيئه مما يمنع حدوث التفاعلات المطلوبه
- تسرب المياه المبرده الى العادم عن طريق البساتم ( وجود سليكون )
- استخدام نوع زيت موتور غير ملائم للمواتير المجهزه بعلبه بيئه
- بعض انواع الاضافات للوقود .. او الى الزيت ( لتكوين طبقه حمايه من التأكل )
- و بالطبع يضاف الى ذلك وجود البنزين النى داخل العلبه ( لاى سبب .. بوجيهات او كويل سيئ او حساس او خلافه )
damage catalyst poisoning occurs when the catalytic converter is exposed to exhaust containing substances that coat the working surfaces, encapsulating the catalyst so that it cannot contact and treat the exhaust. The most-notable contaminant is
lead, so vehicles equipped with catalytic converters can be run only on
unleaded fuels. Other common catalyst poisons include fuel
sulfur,
manganese (originating primarily from the gasoline additive
mmt), and
silicon, which can enter the exhaust stream if the engine has a leak that allows
coolant into the combustion chamber.
phosphorus is another catalyst contaminant. Although phosphorus is no longer used in gasoline, it (and
zinc, another low-level catalyst contaminant) was until recently widely used in engine oil
antiwear additives such as
zinc dithiophosphate (zddp). Beginning in 2004, a limit of phosphorus concentration in engine oils was adopted in the
api sm and
ilsac gf-4 specifications.
Depending on the contaminant, catalyst poisoning can sometimes be reversed by running the engine under a very heavy load for an extended period of time. The increased exhaust temperature can sometimes vaporise or sublimate the contaminant, removing it from the catalytic surface. However, removal of lead deposits in this manner is usually not possible because of lead's high boiling point.
Any condition that causes abnormally high levels of unburned hydrocarbons—raw or partially burnt fuel—to reach the converter will tend to significantly elevate its temperature, bringing the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction. Vehicles equipped with
obd-ii diagnostic systems are designed to alert the driver to a misfire condition by means of
flashing the "check engine" light on the dashboard.
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