Engine - Performance Problems

88chevy07
Number: 88-193-6E

Section: 6E

Date: April, 1988
Subject: INCREASED PERFORMANCE


Model and Year: 1988 S/T TRUCKS WITH 4.3L (VIN CODE Z) ENGINE AND CALIFORNIA EMISSIONS
TO: ALL CHEVROLET DEALERS


Customer comments of lack of performance, poor tip-in response, or engine flatness may be received in connection with some early built S/T trucks with a 4.3L engine and California emissions. A new prom was put into production that addresses these concerns. This new prom is now available for trucks built before the following breakpoints:

172008



The new PROM, part number for the LB4 (4.3L) engine is listed below: