Inca32x

I have a 75 convertible. I purchased a correct complete exhaust system for CA. I have the air pump, check valve, hose and tube that go’s to the exhaust pipe. The problem is the diverter valve dosnt hold vacuum, apparently no one rebuilds them and the few that Are for sale have no quarrenty they will work. What will happen if I run the system as is?

stingr69

Manual transmission shifting may produce after firing between gears. That can damage your exhaust after some time depending on how severe it gets. Disable the system and the problem goes away while still passing visual inspection.

Diverter valves can be rebuilt but I would not go that route unless it was required.

Inca32x

Mine is an automatic if that makes any difference. If I disable the system does it have to be were the air tube is bolted to the exhaust pipe or could it be blocked At the check valve?
Also who rebuilds the diverter?

stingr69

Automatic cars might not be that noticeable. Try blocking the vacuum line to the diverter valve to prevent the vacuum leak and see if it does not afterfire when you let off the gas quickly. Try it first and decide if you really need it to be functional.

I don't know for sure if anyone still rebuilding those valves anymore. Don Dorfman did them but that was a long time ago. Bill Hodel or Greehoes are other names but I think they were all using Don Dorfman for the rebuilt Diverter valves. NOS are out there but they are HUGE money and they are VERY OLD so how long would they last?