Engine Performance - Various Driveability Complaints
05.1-09DATE:
2/95
Sedan Range
MODEL:
1995 MY
Sedan (4.0L) Range
VIN
As listed below
EMS - Cold Idle Instability, Abrupt Low Speed Throttle Transition Warm, Hesitation/Instability at 50/60 MPH (80-100 KM/H) - Repair Procedure
ISSUE:
1995 MY vehicles in the model and VIN ranges listed below may display the following symptoms.
SYMPTOMS
Idle hesitation or instability following cold start.
Hesitation or instability at cruising speeds of 50 - 60 mph (80-100 km/h).
Throttle abruptness ("lurching" or hesitation) at low speed, low throttle application with a warm engine.
MODEL VIN RANGE
Sedan (4.0L NA) Range 1995 MY VIN 720001 - 724499
XJR Sedan VIN 720001 - 740020
These symptoms result from an unfavorable combination of fuel volatility and ignition timing factors. The ECM EPROM has been revised to correct these conditions from VIN 724500 Sedan (4.0L NA) Range, VIN 740021 XJR Sedan and VIN 197550 XJS (4.0L) Range.
ACTION:
If customers complain of the symptoms listed above on vehicles within the quoted VIN range and all other engine parameters are within specification, the ECM will require upgrading. To upgrade an ECM to the latest specifications, follow the procedure outlined below.
ECM UPGRADE PROCEDURE
1. Complete the Dealer Supplied Information section on a photocopy of the attached Engine Management EPROM Upgrade form.
2. Call the Jaguar Technical Hotline (1-800-910-8324).
3. The Jaguar Technical Service Representative will verbally request the Dealer Supplied Information from the form and assign a Case Number which must be written on the form.
NOTE:
A copy of the completed Engine Management EPROM Upgrade form must be retained in the vehicle service file.
4. Ship the ECM together with a copy of the completed form and a return address label showing the Repair Order Number to Lucas Industries, Inc., via Federal Express Priority Overnight Service. The following information must be included on the Federal Express Airbill.
Recipient's Address:
EPROM Upgrade
Lucas Industries, Inc.
4 William Demarest Place
Waldwick, NJ 07463
Recipient's Phone Number:
201-670-7000
Payment:
Bill Recipients FedEx Acct. No: 119542995
The ECM will be upgraded the following day and returned to the dealer via FedEx Priority Overnight Service.
For questions regarding the status of the ECM, call Lucas at 201-670-7000.
IMPORTANT:
Inspect the vehicle to determine if a revised air pump hose with a vacuum bleed has been fitted. If the existing air pump hose has no vacuum bleed, replace the hose with the correct revised hose for the vehicle.
Refer to Service Bulletin 18-47 for the appropriate part numbers and warranty information for step 5.
WARRANTY INFORMATION: