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Old 08-30-2013, 03:20 AM
Gen1dak Gen1dak is offline
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Join Date: Aug 2011
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Vehicle: 1990 RamCharger
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Engine: 1988-1991 318ci (5.2L) LA V8 140hp
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All the little black hoses are vacuum lines. The intake plenum gasket is in the intake manifold. The manifold is a two-piece design (a total piece of crap design). There's a plenum plate that bolts to the bottom and that's where the leak happens. A quick and dirty way to check it is to get up on the engine with a flashlight. Open the throttle and look down into the intake. Shine the light in there and look at the intake floor. Is it shiney (should be) or is it oily/cruddy? If it looks dirty, that's an indication that the gasket is bad and the engine is sucking in crankcase vapors. This upsets the airflow to the cylinders and results in a loss of vacuum. This will cause oil consumption and misfires, rattles from detonation due to a run-lean condition. The worse it leaks, the worse the symptoms get.
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