PROM - Hesitation On Tip-In Acceleration Maneuvers
Number: 85-218Section: 6E
Date: JAN., 1987
Subject: HESITATION ON TIP-IN ACCELERATION MANEUVERS
Model and Year: 1985 CAPRICE/IMPALA WITH
4.3L ENGINE (VIN CODE Z)
TO: ALL CHEVROLET DEALERS
Some 1985 Caprice/Impalas with 4.3L Throttle Body Injection
(TBI) engines may experience a hesitation on a tip-in
acceleration maneuver. This condition may occur during
warm-up or after the vehicle has reached normal operating temperature.
This condition can be corrected by installing a new Service PROM as listed below. Federal vehicles also require a new EGR valve.
EMISSION SYSTEM TRANS. PROM P/N EGR VALVE P/N
Federal 3-sp auto 1227923 17111577
Federal 4-sp auto 1227922 17111577
California 3-sp auto 1227923 Not Required
California 4-sp auto 1227922 Not Required
Use applicable Labor Operation.