S15/T15 2WD P/U V6-173 2.8L VIN B 2-bbl (1983)
PROM - Programmable Read Only Memory: Recalls
Recall - Exessive NOx Emissions
NUMBER:
83-E-15
GROUP:
6E - Engine Emissions
DATE:
February, 1988
SUBJECT:
NOx EMISSIONS
MODELS:
1983 S15 PICKUP EQUIPPED WITH 2.8L ENGINE (RPO LR2, VIN CODE B) AND CALIFORNIA EMISSIONS (RPO NB2)
General Motors has determined that some 1983 GMC S15 pickup model vehicles may be emitting pollutants in excess of allowable standards. Involved
vehicles may not pass the NOx (oxides of nitrogen) emission standard for the state of California. To correct this condition, a new PROM will be installed
on all involved vehicles. Additionally, the primary and secondary vacuum breaks will be inspected for proper operation.
VEHICLES INVOLVED
Involved are certain 1983 GMC S15 pickup model vehicles equipped with a 2.8L engine (RPO LR2, VIN Code B) and California emissions (RPO NB2)
produced within the following VIN breakpoints:
Plant
From
Through
Shreveport
SOP
EOP
The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to
all involved dealers with the campaign bulletin.
DEALER CAMPAIGN RESPONSIBILITY
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time
forward. Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future,
you should take the steps necessary to ensure the campaign correction has been made before reselling or releasing the vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required
correction according to instructions contained in this bulletin. If no owner's name and address were available to GMC Truck Division at the time of
campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on
the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This
second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.
GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of
owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing
may contain owner names and addresses obtained from state motor vehicle registration records. The use of such motor vehicle registration data for any
other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.
SERVICE PROCEDURE
I.
Install new engine calibration PROM per applicable Service Manual instructions, Section 6E.
A.
With automatic transmission use P/N 1228652 PROM.
B.
With manual transmission use P/N 1228653 PROM.
II. Inspect vacuum breaks. Reference Truck Service Bulletin 85-B-64 (copy attached), for proper inspection procedure. Reference applicable Service
Manual, if replacement is required, for service instructions and proper specifications.
