See Figure 1
The catalytic converter is a totally passive device, in that there are no actuators or sensors. Contrary to popular opinion of the late 1970's, it has no adverse influence on the operation of the engine, unless it has melted and causes high exhaust backpressure. If this is suspected, the catalyst can be removed for inspection. By looking into the catalyst inlet, it should be possible to see through almost all of the passages in the honey comb pattern ceramic blocks. If there is any melting which may cause high back pressure, it will be quite obvious. On some vehicles, the catalyst is mounted directly to the exhaust manifold, on others it is farther down stream. On all vehicles, the catalytic converter is before the muffler.
REMOVAL & INSTALLATION
Please refer to the exhaust system removal and installation procedures found in Engine & Engine Overhaul .