CAMPAIGN: LEAKING/PLUGGED EGR VACUUM PIPE ASSEMBLY
General Motors has determined that certain 1983 "S" Series Light Duty Trucks equipped with RPO LQ2 2.0L L4 engine may have leaking or plugged EGR vacuum pipe assemblies.
These conditions may affect engine performance and increase the NOx and CO exhaust emissions.
To bring these vehicles into compliance with applicable emission requirements, Chevrolet Dealers will inspect, and if required replace, the EGR vacuum pipe assembly in accordance with the instructions outlined in this bulletin.
VEHICLES INVOLVED
Involved are certain 1983 "S" Series Light Duty Trucks equipped with RPO LQ2 2.0L L4 engine within the following vehicle breakpoints:
Plant From Through
Pontiac D0100468 D0104610 Shreveport D8100638 D8105074 Moraine D2102710 D2110724
Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to the involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.
These listings 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 the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin was not shipped any involved vehicles.
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included with this bulletin).
DEALER CAMPAIGN RESPONSIBILITY
Dealers are to service all vehicles subject to this campaign, 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 be sure the campaign correction has been made.
SERVICE PROCEDURE
EGR Pipe Inspection Procedure
Step 1. Disconnect vacuum line for distributor vacuum advance can and connect a vacuum gage to removed vacuum supply line.
A. Start engine and warm up until base idle is achieved. (Throttle must be kicked to attain base idle, not on fast idle cam). Idle vacuum should read 5-6" Hg.
B. Move throttle to off idle setting, vacuum should read greater than idle setting. Note: A rapid drop of vacuum should result when throttle is moved quickly, a slow response if the engine is still cold (coolant temperature less than 115 DEG F).
C. Replace vacuum supply line to distributor.
Step 2. Remove 4 port connector from air cleaner.
A. With a vacuum gage attached to 1, vacuum at idle should read 9-14" Hg. A rapid drop of vacuum should result when throttle is stabbed.
EGR Pipe Inspection Procedure
Step 3. Plug port 1 and 4, hook vacuum gage to port 3.
A. At idle, vacuum should read zero(0).
B. At off, idle vacuum should read 3-5" Hg. (A weaker signal than seen at port 1 when the throttle is stabbed).
Step 4. Plug ports 1 and 3, hook vacuum gage to port 4.
A. At idle, vacuum should read zero(0).
B. At an off idle vacuum throttle position, vacuum should read less than seen at port 3.
C. Crimp 1 1/4" long hose at EGR valve, vacuum should equal to reading at port 3.
If the engine is not fully warmed up (water temperature 160 DEG F or higher), there will be no signal at port 4.
Vacuum readings that are not within the specification indicated in the inspection procedure of this bulletin indicate plugged or leaking EGR vacuum tubes and must be replaced. (Refer to Illustration, Page 3) Access to the EGR vacuum tube assembly may best be accomplished by removing the intake manifold. In accordance with the instructions outlined in the 1983 Light Duty Truck "S" Series Shop Manual (Refer 2.0 liter L4 Pages 8 and 9).
PARTS INFORMATION
Parts are to be obtained from the Warehousing and Distribution Division of General Motors (WDDGM). To ensure that these parts will be obtained as soon as possible, they should be ordered from WDDGM on a C.I.O. order with no special instruction codes, but order on an advise code (2).
Quantity Per Part Number Vehicle Descr lon
14058742 1 EGR Vacuum Pipe Assembly
CLAIM INFORMATION
Submit a Product Claim with the information indicated below:
Parts Failed Parts Failure Labor Labor *Other Count Part No. Allowance Code Operation Hours Hours
00 V1670 .3 .1
Description: Inspect EGR vacuum pipe assembly (all models) for leaks and being plugged according to the inspection procedure outlined in this bulletin. Not plugged or leaking, no further action required.
Parts Failed Parts Failure Labor Labor *Other Count Part No. Allowance Code Operation Hours Hours
1 14058742 00 V1671 2.3 .1
Description: Inspect, replace EGR vacuum pipe assembly (all models less A/C) leaking/plugged. Replace in accordance with the instructions outlined in this bulletin.
1 14058742 00 V1672 2.8 .1
Description: Inspect, replace EGR vacuum pipe assembly (all models with A/C) leaking/plugged. Replace in accordance with the instructions outlined in this bulletin.
*Campaign Administrative Allowance
Dealers will automatically receive the correct labor and material allowance plus 30% based on the labor operation performed. Refer to the Chevrolet Claims Processing Manual for details on Product Campaign claim submission.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle modified in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identificaion Label". Each label provides a space to include the five 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.
ADMINISTRATIVE PROCEDURE
REFER TO THE CURRENT CHEVROLET SERVICE POLICIES AND PROCEDURES MANUAL AND CLAIMS PROCESSING MANUAL FOR CAMPAIGN HANDLING AND ADMINISTRATIVE PROCEDURES.
Dear Chevrolet Owner:
General Motors has determined that some 1983 Chevrolet "S" Series Light Duty Trucks equipped with 2.0 liter L4 engines (RPO LQ2) may have leaking or plugged exhaust gas recirculating (EGR) vacuum pipe assemblies. These conditions may affect engine performance and increase oxides of nitrogen or carbon monoxide exhaust emissions.
To bring your vehicle into compliance with applicable emission requirements, Chevrolet Dealers will inspect, and if required replace, the EGR vacuum pipe assembly. This service will be performed at no charge to you. Please contact your Chevrolet Dealer on or after the date shown below to arrange an appoint- ment to have this condition corrected.
Instructions for making this correction have been sent to your dealer. it is estimated that parts will be available at your dealer on or about June 20, 1983. The labor time for inspecting the EGR vacuum pipe is approximately 20 minutes; replacement will take an additional 21/2 hours.
The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist them in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid owner reply card and returning it to us.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
