Engine - Poor Idle/Low Speed/Cruise Performance

18-48

EMS - Cold Idle Instability, Abrupt Low Speed Throttle Transition Warm, Hesitation/Instability at 50/60 MPH (80-100 KM/H) - Repair Procedure

MODEL: All 4.0L 1995 MY As Listed Below

DATE: 5/95

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

XJS (4.0L) Range 1995 MY VIN 194775 - 197549

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 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 07462

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:





Jaguar Engine Management EPROM Upgrade

MODEL VIN

Sedan (4.0L NA) Range 1995 MY 720001 - 724499

XJR Sedan 1995 MY 720001 - 740020

XJS (4.0L) Range 1993 - 1995 MY 194775 - 197549

NOTE:
A copy of this completed form must be retained in the vehicle service file.

Shipping instructions:

Return the ECM, a copy of this 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 07462

Recipient's Phone Number: 201-670-7000

Payment, Bill Recipients FedEx Acct. No: 119542995