Ciera V6-231 3.8L (1986)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine - Stops Running During Low Speed Manuevers
SUBJECT
ENGINE MAY INTERMITTENTLY NOT STAY
NUMBER: 86-T-62B
RUNNING
SOME 1986 CUTLASS CIERA, DELTA 88,
DATE: August 6, 1987
NINETY-EIGHT AND TORONADO MODELS
MODELS/YEARS
EQUIPPED WITH 3.8L SFI ENGINES
SECTION: 6E
(VIN CODES 3 AND B)
NOTICE:
This bulletin supersedes Bulletin 86-T-62A. Please discard 86-T-62A and replace it with this revision which provides updated service
procedures and service PROM part numbers.
Some 1986 vehicles equipped with 3.8L SFI engines (VIN Codes 3 and B) may experience an intermittent condition where the engine may occasionally
not stay running on deceleration or during parking lot maneuvers under closed throttle conditions.
If the condition is 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 PROM which has replaced the obsolete service kit.
Effective August 31, 1987, the four components involved in service kits 25531123 through 25531129 referenced in bulletin 86-T-62A, should only be
replaced individually as necessary, and labor operation number T5123 will be invalid.
NOTICE:
Any warranty claims submitted using T5123 after August 31, 1987, will be rejected.
All service kits currently existing in dealership inventories should be disassembled and the parts returned to dealer stock and used for service
replacements. In the near future, General Motors Service Parts Organization (GMSPO) will issue an information bulletin authorizing return of "Kit
PROM's" to the local parts distribution centers.
Listed below are the revised service procedures and service PROM part numbers for an intermittently "Won't Stay Running" condition:
1.
After it has been determined that the basic engine, engine controls and systems are performing properly, replace the PROM.
2.
Remove the air intake duct from the throttle body. Clean the PCV residue from the throttle body bore in the area behind the throttle plate, using a
shop towel with "GM Top Engine Cleaner" (Part number 1052626) or "AC-Delco Carburetor Tune-Up Conditioner" (Part number X66-P) or
equivalent product that doesn't contain methyl ethyl ketone. It should be noted that what appears to be just a small amount of PCV residue
accumulation can be enough to limit air flow, and result in an inaccurate minimum air rate adjustment.
3.
Reinstall the air intake duct and check the minimum air rate and adjust, if necessary, to 500 rpm using the following procedure:
a.
After the engine has reached normal operating temperature, turn the engine off and ground the diagnostic test terminals of the ALDL
connector.
b.
Turn on the ignition, but do not start the engine. Wait at least 30 seconds.
c.
With the ignition "on", disconnect the IAC motor electrical connector.
d.
Remove the ground from the ALDL connector and start the engine with A/C off.
e.
If necessary, remove the cap from adjusting screw and adjust engine to 500 rpm while vehicle is in drive and A/C is off.
f.
Turn ignition "off" and reconnect connector at IAC motor.
4.
Adjust throttle position sensor to .40-.44 volts. Do not exceed .44 volts.
SERVICE PROM PART NUMBERS
Axle Sales Code
Model
I.D. Located On
Scanner PROM I.D. If
Service
Application
Axle
Deck Lid Decal
This PROM Is Installed
Part Number
Cutlass Ciera
All
N/A
8591
1228591
Ninety-Eight
2.84
F17
8592
1228592
Ninety-Eight
2.97
F79
8593
1228593
Delta 88
2.84
F17
8594
1228594
Delta 88
2.73
FP3
8595
1228595
