Service Procedure, Campaign Label, Service News, Claims & Owner Letter Information
SERVICE PROCEDUREI. 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 Chevrolet Service News, Volume 57, Number 2, page 4, (copy attached) (See Page 4) dated March/April 1985 for proper inspection procedure. Reference applicable Service Manual, if replacement is required, for service instructions and proper specifications.
III. Install Campaign Identification Label.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only on a clean dry surface.
Page 4 CHEVROLET SERVICE NEWS Volume 57-2 1985
FIGURE 5 - VACUUM BREAK AIR BLEED HOLES:
FIGURE 6 - APPLYING VACUUM TO VACUUM BREAK:
Testing Procedure:
1. Determine whether the vacuum brake has a bleed orifice. If it does, it should be plugged as shown. See Fig. 5 for possible locations.
^ Most rear or secondary side units have a bleed.
^ Most front or primary side units do not.
2. Use hand-held vacuum pump to apply 15" Hg (51kPa) vacuum to the vacuum brake, (Fig. 6).
A. The vacuum break plunger should move full travel. Apply finger pressure to plunger to see that it has
moved through full travel. If not, replace the vacuum break and adjust to specification. The labor operation time for replacing the vacuum break unit includes adjustment.
B. The vacuum break diaphragm should hold vacuum for at least twenty seconds. If it does not, replace the vacuum break and adjust to specification.
REMINDER: The carburetor vacuum break is covered under the Five-Year/50,000-Mile Emission Control Systems Warranty. Refer to the "Chevrolet Service Policies and Procedures Manual."
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated below:
*
FAILED PARTS LABOR LAB OTH
REPAIR PERFORMED PC PART NO. ALLOW FC 0P HRS HRS
- Replace PROM 1 1228652 ** 00 V4360 0.9 0.1
- Inspect Only - Primary OR
- Inspect Only - Secondary 1228653
- Replace PROM 2 1228652 ** 00 V4361 1.4 0.1
- Inspect Only - Primary OR
- Inspect/Replace - Secondary 1228653
- Replace PROM 2 1228652 ** 00 V4362 1.4 0.1
- Inspect/Replace - Primary OR
- Inspect Only - Secondary 1228653
- Replace PROM 3 1228652 ** 00 V4363 1.2 0.1
- Inspect/Replace - Primary OR
- Inspect/Replace - Secondary: 1228653
* Campaign Administrative Allowance
** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 30% of all parts required for the repair.
Dealers will automatically receive the correct labor and material allowance based on the labor operation performed.
Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.
Dear Chevrolet Owner:
This notice is sent to inform you that Chevrolet Motor Division is conducting an emission recall campaign that includes your vehicle.
REASON FOR THIS RECALL
General Motors has determined that some 1983 Chevrolet S-10 pickup model vehicles equipped with a California emissions system 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.
WHAT WE WILL DO
To correct this condition, the calibrator (PROM) in your vehicle's Electronic Control Module (ECM) will be replaced with a new PROM. Additionally, certain carburetor components (primary and secondary vacuum breaks) will be inspected, and if required, replaced. This service will be performed for you at no charge.
WHAT YOU SHOULD DO
Please contact your Chevrolet dealer as soon as possible to arrange a service date. Instructions for making this correction have been sent to your dealer. The labor time necessary to perform this service/inspection is approximately fifty-five (55) minutes. If the vacuum breaks require replacement, an additional twenty (20) to thirty (30) minutes will be required to service your vehicle. In either case, please allow some additional time for your dealer to process your vehicle.
The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid reply card and returning it to us. Should your dealer not schedule a service date within a reasonable time, we recommend you contact the nearest Chevrolet Branch Office, either in person or by telephone. The Branch office will assist you and the dealer in getting your vehicle corrected. For your convenience, the locations and telephone numbers of the Branch Offices have been attached to this letter.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.