Exhaust System - Sulfur Odor
Article No.93-24-19
11/24/93
EXHAUST - 4.0L - SULFUR ODOR
LIGHT TRUCK:
1990-93 RANGER
1991-93 EXPLORER
This TSB article is being republished in its entirety to correct the model application.
CALIBRATION:
0-58A-R00, 0-58P-R00, 1-58A-R10, 1-58P-R10, 2-58A-R00, 2-58P-R00, 0-58B-R00, 0-58R-R00, 1-58B-R10, 1-58R-R10, 2-58B-R00, 2-58R-R00
WARNING:
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.
ISSUE:
An objectionable exhaust sulfur odor may be experienced during various driving conditions. This may be caused by the operating strategy of the EEC IV processor or by the catalytic converter, depending on the particular application.
ACTION:
Use the following procedure to determine if a new EEC IV processor or a new catalytic converter is required. Vehicles previously serviced by TSB 93-3-17 may already have had the processor changed.
1. Perform the diagnostic procedure in the 1993 Powertrain Control/Emissions Diagnosis Service Manual, Page 2A-73. Service as required.
2. If the vehicle is a 1991-1992 Explorer with automatic transmission and the sulfur odor still exists:
a. Verify the processor part number. If not already updated, install a new EEC IV processor. Refer to the EEC IV Processor Application Chart contained in this TSB article for correct parts usage.
NOTE:
THE BAP SENSOR IS NOT REQUIRED WITH THE NEW POWERTRAIN CONTROL MODULE BUT MAY REMAIN CONNECTED WITHOUT INTERFERENCE.
b. For 1991 models only, in addition to the standard entries on the Authorized Modifications Decal, write in the following instructions: "USE 1992 POWERTRAIN CONTROL/EMISSION DIAGNOSIS SERVICE MANUAL".
3. If the vehicle is:
a. a 1991-1992 Explorer with manual transmission,
b. a 1993 California Ranger/Explorer (automatic or manual transmission), or
c. a 1990-1992 Ranger (automatic or manual transmission), and if a sulfur smell exists after the vehicle has accumulated 2000 or more miles of service, install a new catalytic converter. Refer to the Catalytic Converter Reference Chart shown. Do NOT replace the EEC IV Processor in these vehicles.
Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.
Parts Block
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 93-22-18
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992/93 Models, Basic Warranty Coverage For 1990/91 Models And Emissions Warranty Coverage For All Model Years
OPERATION DESCRIPTION TIME
932419A Perform EEC IV Diagnosis 0.5 Hr.
(includes Time To Retest) -
All Vehicles
932419B Replace PCM - 1991-92 0.3 Hr.
Explorer equipped with
A4LD Automatic Transmission
932419C Replace Catalytic Converter 1.0 Hr.
- 1991-92 Explorer (Manual
Transmission), 1990-92
Ranger (Automatic or
Manual Transmission), 1993
Ranger or Explorer with
California Emissions
(Automatic or Manual
Transmission)
DEALER CODING
BASIC PART NO. CONDITION CODE
ODOR 08
OASIS CODES: 403000, 623000