General Motors has used the 3.8-liter, V-6 engine in the Pontiac for 30 years. The engine was the subject of two recalls to remedy oil leak problems. Coolant leaks were also reported with the engine.
Supercharged V-6 Problem
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In April 2008, General Motors recalled Grand Prix GTP model automobiles from the 1997 through 2003 model years. These models are equipped with the 260 hp, supercharged 3.8-liter, V-6 engine. The problem stems from the gasket under the front rocker cover. High temperatures under the front rocker cover can cause the gasket to fail prematurely. The result can be an oil leak and a possible engine fire.
Regular V-6 Problem
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In April 2009, General Motors recalled 1997 through 2003 Pontiac Grand Prix GT model automobiles equipped with the 200 hp, naturally aspirated, 3.8-liter, V-6 engine. Engine oil may drop on the exhaust manifold under hard braking conditions. The oil can ignite hot plastic parts and result in an engine compartment fire.
Intake Manifold Problem
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Coolant leaks were also noted with the 3.8-liter engine during 1997 through 2003 model years. The leaks were caused by failure of either the intake manifold gasket, throttle body gasket or failure of the nuts securing the the throttle body. Cracked intake manifolds were reported by some owners. The consequences of the gasket and manifold problems are coolant and oil mixing causing sludge and engine damage.