What is the difference between a Catalytic Converter and a Universal Catalytic Converter?
Direct to fit Catalytic Converters come ready to install with all parts pre-welded. These are better for the DIY professional. Universal converters are cheaper, but require cutting, welding, etc. These installations are best left for the shop professionals.
There are no differences. High flow catalytic converters are not really high flow; the catalytic converters you have on your vehicle are as high flow as you need them to be. A "high" flow converter will either be of a larger diameter, or the inside is made in such a way that there is less restriction to exhaust flow.
There are two available options to replace the catalyticÊconverter. Option one, buy a universal converter that is the right size for the car. Cut the old converter from the exhaust pipes and weld on the new one. Option two, buy a direct fit converter that can be bolted in between the exhaust manifold and the exhaust pipe. No welding is needed but the direct fit converter costs more than the universal one.
It is in the exhaust pipe between the header and the catalytic converter. That is, it is downstream from the header, and upstream from the catalytic converter. The first O2 sensor is located under the hood on the driver's side. It is located in the exhaust pipe between the header and the catalytic converter. The second O2 sensor is located in the exhaust pipe between the catalytic converter and the muffler. The wire runs up…
Depends on the vehicle. Sometimes they are all the same. Sometimes the O2 sensors in front of the converter are heated while the rear ones aren't. But the main difference is that the front ones are the ones that effect how the engine runs. The rear ones don't effect how the engine runs. They are only there as a check on the catalytic converter.
Disconnect the frontand rear o2 sensor electrical connectors. Separate the catalytic converter from the flex-pipe. Remove the fasteners between the catalytic converter and the exhaust manifold. Disconnect the EGR tube from the catalytic converter. Remove band from the front of the catalytic that holds it to the bracket on the front of the engine block. Remove fasteners holding exhaust manifold to head.
My Haynes repair manual shows 2 oxygen sensors mounted between the engine and catalytic converter(s) and 2 oxygen sensors mounted after the catalytic converter(s) which are called catalyst monitors and monitor the efficiency of the catalytic converter(s) on your 1997 Explorer XLT with the 4.0 L SOHC engine
There are 2 O2 sensors. One is in the front (bank 1) before the catalytic converter, between the exhaust manifold and the catalytic converter, and the other is in the rear (bank 2) after the catalytic converter and is screwed in. The front one is heated and the rear is not. That means after the car begins to heat up the front one comes on and the rear is always on.