Question about Measuring Tools & Sensors
How does the breather work and what does it do ? How does it effect the starting process
When an engine is running there are compression gases escaping past the ring gaps into the sump. the crankcase breather allows this build up of pressure in the crankcase to escape before it gets high enough to blow out the oil seals. In modern cars the gases are drawn out by a PCV valve that is connected to the inlet manifold and this valve is opened when the vacuum exceeds the spring tension of the valve.. If there is a faulty PCV valve ( clogged from oil gunk build up,carbon or the like ) it may affect the starting of the engine by upsetting the fuel/air mixture. In modern EFI controlled engines this will probably result in the ECM being unable to correctly set the air/fuel ratio for starting as the mixture may be too lean . If this valve is faulty --run the fault codes and a code will appear or simply change the PCV valve and make sure that the hosing is fixed tightly.
Posted on Nov 21, 2014
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Posted on Jan 02, 2017
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