Fuel - Intake Plenum Runners Restricted By Casting Flash
Bulletin 85-6-30Date Apr. '86
Ref. No. 85-324-6
SUBJECT: INTAKE PLENUM RUNNERS RESTRICTED BY CASTING FLASH
MODELS AFFECTED: 1985 SKYLARKS WITH 2.8L MPFI V-6 ENGINES (VIN CODE W)
FIGURE 1 - INTAKE PLENUM ASSEMBLY:
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 illustration.
To correct this condition, replace the inlet plenum using applicable labor operations and times as published.