Engine Performance - Stalls After Cold Start
Bulletin No: 001/95Issued: 1/13/95
Revised: 1/30/95
Category
F
Applicable Model/s
1993 Navajo
Subject:
STALLS AFTER COLD START
NOTE:
This bulletin was previously released as Cat. F, # 008/94. Replace the original bulletin with this revised copy.
DESCRIPTION
Cold start stalls may occur with manual transmissions and "cold engagement" stalls may occur with automatic transmissions. This condition may occur once per warm-up cycle. The cause of the stall is calibration sensitivity to available fuels. A countermeasure Powertrain Control Module (PCM) is available to correct this problem. The countermeasure PCM will richen the fuel system during the following conditions:
^ Cranking ^ Start-up Open Loop
^ Underspeed ^ Automatic Transmission Engagement
REPAIR PROCEDURES
1. Perform normal diagnostics
2. Verify that the stall occurs once per warm-up cycle on cold start (M/T) or cold engagement (A/T).
NOTE:
It may be necessary for the customer to confirm the problem (the next morning) after the initial diagnostics are performed.
3. If the problem still exists, replace the PCM with a countermeasure part. Refer to the calibration chart for the correct part application.
NOTE:
The old calibration is posted inside the driver's door jam.
4. Verify repair.
PARTS INFORMATION
WARRANTY INFORMATION
(Applies To Verified Customer Complaints On Vehicles Covered Under Normal Warranty. Refer To The SRT Microfiche For Warranty Term Information.)
Warranty Type: A
Symptom Code: 05
Damage Code: 9W
Part Number Main Cause: ZZL4 18 941
ZZL1 18 941
ZZMB 18 888
ZZL6 18 881
ZZL5 18 941
Quantity: 1
Operation Number/Labor Hours: F0003XDX / 0.5 Hrs. (Control System Diagnosis)
FO812XRX / O.6 Hrs. (Powertrain Control Module R&R)