Lumina L4-151 2.5L (1991)
IB. HARSH 3-2 AND/OR 4-2 SHIFTS - 1985-90 A Cars AND 1990 W CARS
Service Procedure:
Harsh 3-2 and 4-2 shifts at any altitude may be caused by a missing or partial hole in the spacer plate. Remove the valve body and inspect the spacer
plate for a missing or partial governor passage hole (25) as shown in Figure 3. A partial hole can be drilled out using a # 77 drill bit to meet the hole size
requirement of .46 mm (.018"). If the hole is missing, use the spacer plate gasket and control valve body as a guide to locate and drill the hole, or replace
the spacer plate.
IC. Intermittent Harsh Part Throttle 3-2 Shift
