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Tema: NOX reduction en Jeep Cherokee 2.5 Lt

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  1. #1
    Avatar de R1ch1
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    Exclamation NOX reduction en Jeep Cherokee 2.5 Lt

    Pregunta para conocedores, traje una cherokee de USA es motor 2.5 litros MPFI, la lleve a RTV pero no me hacen prueba de gases porque ese motor de fabrica no trae EGR, me dicen que tengo que demostrar que el motor trae un sistema sustituto de reducción de gases NOX, alguien sabe algo de esto o donde podría encontrar información sobre esto?
  2. #2
    Avatar de rocelot
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    Crei que ya habian quitado eso de RTV, que año es ??? Ud no sabe como trabaja los gases ese motor?
  3. #3
    Avatar de R1ch1
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    Crei que ya habian quitado eso de RTV, que año es ??? Ud no sabe como trabaja los gases ese motor?
    No lo quitaron mas bien lo acaban de poner, si se quiere inscribir un carro a partir de este año tiene que tener 2 cosas o EGR o algún sistema de válvula variable, VVTI, VVL, V-TEC, MIVEC, etc.

    Es año 1995, si se como funciona, es un sistema sencillo de EVAP-Canister, pero lo que me pide rtv no es el sistema de reduccion de HC y CO, es de NOX, y esto solo se hace mediante EGR o VVT.
  4. #4
    Avatar de rocelot
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    R1ch1 agradece este aporte.
  5. #5
    Avatar de R1ch1
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    Gracias tito, pero el asunto es que el carro no trae EGR de fabrica.
  6. #6
    Avatar de Ramos
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    If we're not mistaken your vehicle is NOT equipped with an EGR valve, and it's main failure appears to be NOx.

    Some Specifics: At first glance of the emission numbers and the fact that the vehicle in question is a Non-EGR Equipped Jeep, our first assumption would be that the CAT (Catalytic Converter) is damaged, more then likely plugged. A vehicle's CAT usually becomes plugged after a material breakdown within it normally due high exhaust temperatures and rich fuel. After first inspecting the fuel and ignition systems, an intrusive CAT test and Back Pressure/Vacuum test may be perfromed. These tests will determine whether the CAT is plugged or not.

    The important thing here is this... if in fact the CAT is damaged, it is important to insure a pre-existing problem is not the culprit. You don't want to damage the new CAT. A CAT melt down usually occurs due to high CO (Rich Fuel), old age, and extreme heat. It is recommend to suspect the CAT after a complete emissioms systems diagnostics has been completed.

    NOx stands for Nitrous Oxide. NOx is a chemical created when an engine's combustion chamber temperatures rises above 2500 Fahrenheit. CO stands for Carbon Monoxide. CO is a by-product of incomplete combustion caused by either too much or not enough fuel being sent to the combustion chambers. Fuel distribution to your engine's combustion chambers is controlled by your vehicle's ECU(Engine Control Unit) and fuel injectors.

    The Catalytic Converter, commonly referred to as the CAT is a component designed to continue the combustion process within itself and emit a more thoroughly burned and less harmful emission containing exhaust. It is normally placed between your engine's exhaust port and your car's muffler. It allows the engine exhaust to pass through while it reduces all emissions. A good CAT should dramatically reduce HC, CO and NOx. The CAT is a catalyst, it plays a very small part on how well your engine runs and it only begins working after exhaust has exited the engine's combustion chambers. Catalysts are not designed to last forever. From time to time they need replacement. How long your vehicle’s CAT will last depends on how completely your engine burns fuel before presenting it the to the CAT and also on the quality of the CAT. Factory CATs should normally last 5 to 10 years. Aftermarket CATs should work for at least half that (for the cost difference it is recommended using an aftermarket CAT). We see this failure more often in vehicles which have produced high emission numbers in more then one category.

    The most accurate way to find out if your vehicle CAT is working efficiently is by using an exhaust gas analyzer. Unfortunately this tool is fairly expensive and not designed for home use. You must visit a local smog station and have the smog technician inspect the CAT via the shop’s gas analyzer.

    Obvious symptoms of a bad CAT however could be any of the following:

    a. loss of power over 15-25 mph (CAT is plugged up and restricting exhaust flow)

    b. very strong exhaust smell on a vehicle that runs great(engine running efficiently, but CAT not completing the burning process)

    c. Loud rattle being heard from inside the CAT (CAT substrate broken up).

    NOTE: A common reason for NOx failures which DOES NOT apply to your vehicle, is a malfunctioning EGR valve and/or plugged up EGR ports and passages. EGR (valve) stands for exhaust gas recirculation. The EGR system normally includes the EGR valve, EGR control system and EGR ports/passages. This system recirculates burned up exhaust gases back into the combustion chambers. The fact that recycled exhaust gases have already been in the combustion chambers once and have already burned up 90 percent of their fuel means there is now much less raw fuel in the combustion chambers to ignite. This allows the engine to run cool and keeps NOx levels within limits. The EGR valve should normally be inspected to insure its proper operation. Carbon deposits often plug up the EGR passages and cause the valve to stick. In your vehicles case, there is no EGR valve and therefore nothing to inspect.

    Vehicles without EGR valves have a tendency to develop CAT problems sooner then those which are equipped. Due to the fact there is no EGR valve to reduce NOx, this operation is performed by the CAT, and proper fuel management.

    You may find more information or email a live technician at http://www.smogtips.com

    Source:

    http://www.smogtips.com
    ****************************************
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  7. #7
    Avatar de luismariano
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    Y mae ese toque si está feo.....si quiere le puedo pasar el fsm a ver si encuentra algo de info que le sirva
  8. #8
    Avatar de josueazm
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    que idiotez si ellos son los que hacen la prueba ellos deberian saber cuales carros traen y cuales no, yo como usted les hago un despiche, o es que esperan que todos los que usan rtv sean mecanicos?

    --- Actualizado ---

    Gracias tito, pero el asunto es que el carro no trae EGR de fabrica.
    busque el manual de usuario en internet ahi tiene que venir el diagrama, o en la tapa viene, ahi se ve sino trae esa valvula, o que quieren esos playos de rtv?
    I became insane, with long intervals of horrible sanity

  9. #9
    Avatar de Ramos
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    Y si va a otra estacion de RATEVE?
  10. #10
    Avatar de josueazm
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    Y si va a otra estacion de RATEVE?
    no porque es una norma, en todas las estaciones es la misma chapi, ya se les habia ocurrido esa brillante idea antitos de la expomovil entonces las agencias se quejaron igual hay carros del año que no usan ese sistema, o carros viejos que no lo traen, pero como les cuesta la tabla del cero en rtv lo estaban pidiendo parejo, y ahora les dio el mismo camote.
    Ramos agradece este aporte.
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