Engine Controls - Driveability Conditions/Codes: Overview

91chevy04

Number: 88-423-6E


Section: 6E


Date: July 1989




SUBJECT: DRIVEABILITY CONDITIONS AND/OR STORED ENGINE CODES 23, 25, 33 OR 34


Model and Year: 1987 J CARS AND 1987-88 A, L CARS WITH 2.8L ENGINES (VIN CODE W)


TO: ALL CHEVROLET DEALERS


Some customers with an engine/vehicle combination listed below


1987 J-Car With a 2.8L Engine (Vin Code W)
1987-88 A and L Models With a 2.8L Engine (Vin Code W)

may comment that they have experienced one or more of the following conditions:

A cold start stall or sag

A decel stall

A tip-in hesitation

A check engine light with stored Codes 23, 25, 33, 34 or


An engine speed flare during a declutch operation with a manual transmission equipped vehicle.


These conditions may be attributed to a number of components/interactions. In the interest of simplifying diagnosis and repair, the following procedure has been developed to reduce system sensitivity, thereby addressing a variety of potential causes simultaneously.

If a customer comment concerning an occasional engine stall or a drive hesitation is received, and/or a stored Code 33 or 34 is found, then complete the following procedure: