I seem to have a vacuum leak somewhere, 86 gt 2.8. runs rich. poor milage, Are there some common places to look for vacuum leaks? Also will a vacuum leak affect brake performance? Any help would be greatly appreciated. Thanks
One of the most common spots for a vacuum leak is the EGR tube. About the easiest way to 'check' that one is to cut out the side of a soda can to make a blanking plate. Cut it down to size so that it will fit between the bolts of the EGR tube. Loosen the bolts on the bottom of the upper intake manifold and slip the blank in and retighten the bolts. If everything returns to normal you have found your leak. If not, you either have more leaks or it is leaking somewhere else. I had one of the hoses that run under the intake manifold rub a hole in the side of it. That took me a while to find. I don't see a vacuum leak affecting braking unless the leak is on the brake booster line and is significant.