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Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intervening carburetor or throttle body leading to the intake manifold. It is a ...
A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head gasket leak). White smoke from the exhaust suggests that coolant is ...
The EJ251 commonly experienced head gasket failures in the form of interior channel breaches or exterior fluid leaks due to the use of a single layer coated gasket, vs the Multi-Layer Steel (MLS) gasket used in later models. Intake air mass is calculated by the use of a MAP sensor and Intake Air Temp Sensor, unlike the EJ253 which uses a MAF ...
Gaskets and shaft seals were intended to limit the leakage of oil, but they were usually not expected to entirely prevent it. The blow-by gases would diffuse through the oil and then leak through the seals and gaskets into the atmosphere, causing air pollution and odors. The first refinement in crankcase ventilation was the road draught tube.
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The 1981 301 Turbo gained the electronic controls with an O 2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205 hp (153 kW) and 340 lb⋅ft (461 N⋅m).The 301 Turbo was limited to Trans Am and Formula Firebird production only. 301:Naturally Aspirated 1977-1981 Pontiac Bonneville; 1977-1981 Pontiac Catalina