by pennyman1 » Tue Jan 11, 2011 4:29 pm
It is a reed valve, used in place of an air pump to inject air into the cat to dilute the exhaust gases. The valve only opens when a cylinder fires and spent gases are pushed out the exhaust manifold. If the valve is bad(stays open) it will cause a huge exhaust leak and the motor will run like crap. If you don't have smog to deal with, plug the hole in the exhaust manifold where the pipe enters. If you could find a new one, expect to pay upwards of $300 for one. Its really not necessary if the truck is tuned up for normal use.
Pennyman1
Living the D-50 life since 1980
The best Dodge that Dodge never made