When installing a universal converter, it must still meet the emission requirements of the vehicle and can not be chosen by size alone. By looking up your specific vehicle in the catalog or web site, you will find the recommended universal converter with the appropriate loading. If a universal converter is not listed for your specific application, please refer to the universal converter specifications guidelines.
Converters will get red hot when excess fuel is introduced directly into it, along with sufficient oxygen to burn the fuel. This is not a problem with the converter itself, but the result of a problem with the fuel system or ignition that allows unburned fuel to pass through the engine and then travel down into the converter. If the root cause is not corrected, the new converter will melt as well. Common causes of a melted converter are: 1) A three-way plus air vehicle running rich, and when the air is injected into the converter, the rear brick will melt as the excessive fuel now has enough oxygen to burn inside the converter, 2) Vehicle is running rich with an exhaust leak, and when the air is drawn into the exhaust pipe and is combined with the excess fuel, it will burn in the converter, 3) The vehicle has a misfire. When the air-fuel charge leaves the combustion chamber without firing, it will travel through the exhaust pipe and burn in the converter.
If a converter is operated too long at a high temperature, the substrate may "melt down" and turn into a solid mass inside the converter. The vehicle may seem sluggish as if there was a loss of power. Other causes might be: 1) upstream converter has broken up and the debris has clogged a down stream unit, 2) the support mat may have become damaged and no longer retaining the brick in the correct position, allowing the brick to shift and block the exhaust flow.
If a replacement converter fails after a short period of time, then the root cause of the original failure has not been addressed. Some causes are contamination by silicone based sealants, coolant leaks, oil blow by, high sulfur fuel, and/or rich fuel mixtures forming carbon deposits can quickly coat the substrate preventing it from working effectively.
In August, 1986, the U.S. Environmental Protection Agency issued new EPA converter guidelines for the construction, efficiency and installation of aftermarket converters. The converters listed in the Walker catalog have been designed and manufactured to meet the EPA policy and emission reduction requirements.
A three-way converter (also known as oxidation/reduction converters) are designed to control levels of carbon monoxide, hydrocarbons, and oxides of nitrogen. Some three-way converters are equipped with an air injection tube, and this additional air, which comes from the air pump, assists the chemical reaction in the oxidation catalyst. Walker converters all utilize three-way catalyst technologies, and will operate in a two-way mode (controlling hydrocarbons and carbon monoxide) on older vehicles requiring a two-way converter.
To determine if a vehicle has California emissions, check the emissions sticker on the vehicle, which is located in the engine compartment. If the sticker states the vehicle meets California requirements, then the vehicle is equipped with California emissions.
No. A diesel engine has different emission requirements and a gas engine converter will not function on a diesel engine.
Vehicles licensed outside of California, but built to California emissions standards, may have a physical difference from a vehicle built to Federal emissions standards. (If your vehicle is manufactured to California emissions standards, it cannot use a converter that is cataloged as Federal only). You need to reference your vehicles emissions sticker before purchasing a Walker converter. A vehicle licensed in the State of California must use a CARB approved converter.
No. Converter meltdown is primarily contributed to an engine misfire. The unused air and fuel resulting from an engine misfire will cause an intense fire inside the catalytic converter damaging it internally. Normal operating temperatures of a converter are 500-800° F, and up to 1200° F when the vehicle is under heavy load. To melt the catalytic converter's substrate, the temperature inside the converter would have to exceed 2000° F.
There is no guarantee that replacing the converter will keep a fault code from coming back. If engine performance issues exist, and it has not been repaired, the P0420/P0430 fault code may recur.
Typically converter failures fall in to one of the following categories:
A P0420 low efficiency code does not always indicate that the converter needs to be replaced. On newer vehicles a low efficiency code can occur if the exhaust feed gases are not of the proper balanced to allow the converter to operate efficiently. An experienced emissions technician may be able to identify and resolve this concern with a scan tool, the most effective way for most technicians to diagnose this condition is through the use of a 5 gas analyzer.
Yes,