chevrolet Workshop Repair Guides

Chevrolet Workshop Service and Repair Manuals

Oil Pressure Switch (For Fuel Pump) > < Intake Plennum - Rough Idle, Poor Engine Performance
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FIGURE 1 - FLASHING AREA

A Condition exists whereby one or more ports of the inlet plenum can be partially or completely blocked with casting flash. The condition can cause
rough idle, rough engine operation, and/or poor performance. The casting flash, if present, can be found approximately two (2) inches in from the
plenum mounting surface by probing with feeler stock. The casting flash may not be visible to the eye (see Figure 1).

To correct this condition, replace the inlet plenum using applicable labor operations and times as published.

Oil Pressure Switch (For Fuel Pump) > < Intake Plennum - Rough Idle, Poor Engine Performance