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idlesurge [2010/05/21 10:08] dmertz |
idlesurge [2011/08/18 09:14] twdorris |
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**Engine speed is primarily determined by the amount of air that is allowed to enter the cylinders.** | **Engine speed is primarily determined by the amount of air that is allowed to enter the cylinders.** | ||
- | Normally air enters the cylinders only through the four paths through the throttle body, ISC, FIAV, BISS and throttle plate, but there are also various ways that air can leak in. Resolving idle surge means identifying and correcting the cause of too much air being admitted into the intake manifold. | + | Normally air enters the cylinders only through the four paths through the throttle body (ISC, FIAV, BISS and throttle plate), but there are also various ways that air can leak in. Resolving idle surge means identifying and correcting the cause of too much air being admitted into the intake manifold. |
===== Air Leaks ===== | ===== Air Leaks ===== | ||
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* intake manifold gasket | * intake manifold gasket | ||
* throttle body gasket | * throttle body gasket | ||
+ | * throttle body butterfly valve seals | ||
* a damaged diaphragm in the BOV | * a damaged diaphragm in the BOV | ||
* a damaged diaphragm in the wastegate actuator | * a damaged diaphragm in the wastegate actuator |