Caprice V6-262 4.3L VIN Z TBI (1985)
EGR Valve: Customer Interest
EGR - Surge in High Gear with TCC Engaged
85-84
6
MAY, 1985
Subject:
ENGINE CHUGGLE OR SURGE DURING 3RD AND/OR 4TH GEAR WITH TORQUE CONVERTER CLUTCH ENGAGED
Model and Year:
1985 IMPALA/CAPRICE WITH 4.3L LB4 ENGINE
TO:
ALL CHEVROLET DEALERS
Customer driveability comments of chuggle or surge may occur on some 1985 Impalas and Caprices equipped with 4.3L LB4 engines built prior to
November, 1984. Chuggle or surge occurs when the transmission is in high gear and the TCC is engaged. This condition is most noticeable at 32-35 mph
on three speed transmissions and 45-50 mph on four speed transmissions when the throttle is held steady and the engine is under a light load such as
climbing a slight grade.
This condition can be repaired by installing a new inlet manifold, P/N 14094012, and a new EGR valve, P/N 17111294.
NOTICE:
The new intake manifold and EGR valve were installed as a coordinated change. A check of the EGR valve part number should eliminate
the possibility of more than one component change on any one engine.
The procedures to be followed for this repair are detailed in the appropriate section of the Service Manual.