ENGINE DOES NOT STAY RUNNING ON INITIAL COLD START

SUBJECT: ENGINE DOES NOT STAY RUNNING ON INITIAL COLD START AND/OR POOR COLD ENGINE PERFORMANCE

MODELS AFFECTED: 1989-90 CENTURY WITH 3300 (VIN N) AND 4T60 (440T4) TRANSMISSION 1989-90 CENTURY AND SKYLARK MODELS WITH 3300 (VIN N) AND 3T40 (125C) TRANSMISSION

THIS BULLETIN HAS BEEN REVISED TO ADD 1989-90 SKYLARKS WITH 3300 ENGINE AND 125C TRANSMISSION AND TO ADD NEW PART NUMBERS. DISCARD BULLETIN 89-6E-17, AS THIS BULLETIN SUPERSEDES INFORMATION IN IT.

Some 1989-90 Century and Skylark models equipped with a 3300 engine (VIN N), may experience a condition described as engine does not stay running on initial cold start and/or experience poor cold engine performance.

If these conditions are experienced on a vehicle when the basic engine controls and systems are performing properly, and cannot be repaired by using currently published service and diagnostic procedures, it may be necessary to install a new service Mem-cal.

The Mem-cals are currently available through GMSPO under the following part numbers:

MEM-CAL MEM-CAL MEM-CAL SERVICE SCANNER BROADCAST YEAR SERIES TRANSMISSION PART NUMBER I.D. NO. CODE ---- ------- ------------ ----------- -------- ------ 1989 Skylark 3T40 (125C) 16155988 6014 AWLY 1990 Skylark 3T40 (125C) 16155992 6044 AWMB 1989 Century 3T40 (125C) 16155989 6024 AWLZ 1989 Century 4T60 (440T4) 16155990 6034 AWMA 1990 Century 3T40 (125C) 16155995 6054 AWMC 1990 Century 4T60 (440T4) 16155996 6064 AWMD

WARRANTY INFORMATION: Use applicable labor operation and time.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.