Lesson 3
Any large dents in the muffler, exhaust pipe, or tailpipe will slow down the flow of escaping gases and
reduce engine power. A muffler that is full of carbon deposits will also restrict gas flow. You cannot see
this kind of restriction, but if you suspect it, connect a vacuum pressure gage to the intake manifold. If the
exhaust system is restricted, the manifold vacuum will read normal when the engine is first started but will
drop rapidly.
Repair of the exhaust system is almost always limited to the replacement of parts. Never attempt to remove
parts while they are still hot.
65
Previous Page
