I would hook up the pcv valve for the emissions testing. At idle....vacuum is being pulled on the pcv valve to hold it open and vent the crankcase. The metal nipple on the valve cover with the filter on it is the pcv valve.....it doesnt look like all the other plastic ones u r probably used to. All engines have a certain amount of combustion gasses that pass by the rings....especially old engines that have worn rings. This will pressurize the crank case, dilute the oil, and cause oil sludging. It would be a good idea to take it off and spray a bunch of carb cleaner through it to make sure its not plugged up. You can remove it and shake it in your listening for it to rattle. It must click or its clogged up.
Do you have an air pump on the engine driven by the belt. Its gotta be up and running to pump fresh air into the exhaust stream. This will heat up the cat and help it work.
Bookmarks