I will do that. I will get back to you to let you know how I made out. Thanks Bernie11

 

I've had this problem ever since I bought the vehicle. This design will never work properly because of one simple gas law that has been over looked; PV1 = PV2. In other words the exhaust pressure will allways be greater than what that pump can produce. GM used a check valve, but the exhaust will allways work against it.

I replaced all these parts in the system except for the manifold check valves in hopes that I could close the electrical loop. Which it does work during a cold start up. But the code will come back during normal driving conditions.

There are two more methods that I haven't done yet. One would be to bypass the check valve and install a nozzle before the first cataylic converter. It would still require a check valve but the valve would have to smaller so that fresh air can over-compensate the exhaust back pressure.

The other would be to have the chip modified to ignore the secondary reflash. But the problem with this is the computer has been wave soldered. Don't know if that's an issue.