Some where in there is a dump valve. After checking the VSV for proper operation and confirming the Air Pump actually pumps air, it’s time to dig into the engine to test the valves and clear the Air passages if possible. Removing a few choice components on the Porsche 911 makes access to the divert-er or “Dump” valve and check valve possible. Porsche uses a vacuum reservoir to help vacuum operated function during low engine vacuum conditions. It is mounted on a fixture which bolts over the air passages we are looking for. Ahhhh! there it is. The very dangerous and highly elusive Dump valve. I think I’ll make it mad.
EFFICIENCY – There is a lot of thermochemical energy in gasoline, but there is even more energy in water. The DOE has quoted about 40%, 50 it is probably much more than that. Most people are unaware that ‘internal combustion’ is DEFINED as: a thermo-vapor process; as in ‘no liquid in the reaction’; AND most of the gasoline in a standard internal combustion engine, is ACTUALLY CONSUMED cooked and finally broken down) IN THE scrap catalytic converter price guide, which happens AFTER the fuel has been not-so-burnt in the engine. Sadly, this means that most of the fuel we use in this way, is used only to cool down the combustion process, rather than using a cleaner and more efficient means to do so.
The next step is to locate the converters that you would like to remove from the exhaust pipes. The look of the catalytic converters will vary depending on the year as well as the make of the vehicle. It would usually look like a flattened part of the exhaust and it would usually be one foot long. The catalytic converters can be found on the forward art of the exhaust on the front door area.
With the consistent progress in the chemical formulation and metallurgy, this device has become very high-tech. It is an effective gadget and is very efficient.
Water is pumped as needed to replenish and maintain the liquid level in the chamber. The electrodes are vibrated with a 0.5-SA electrical pulse which breaks 2(H20) — ( 2H2 + 02 ).
The O2 sensors also tell DME if the air from the air pump is reaching the catalyst. If the secondary air injection system is working properly DME should see a drop in voltage in a conventional O2 sensor. On the newer A/F sensors the technician will need to access fuel trim data to see if the fuel system is trying to adjust when the air pump is artificially triggered. So the air pump pumps air but there are some mechanical controls in the way of the air actually getting to the exhaust side of the equation. There is a vacuum switchover valve (VSV) and a vacuum operated “Dump Valve” that when vacuum is applied by way of the VSV allows air to enter the exhaust through a check valve which keeps exhaust gasses from returning through the “Dump Valve” damaging it and the pump.
Start the vehicle. Look for any leaks and listen to be sure the car sounds quiet and well tuned. Lower the car from the blocks and give it a test drive before you conclude your repairs. With these simple steps, you can change rusty exhaust equipment on your own, and save hundreds in repair costs.