S15/T15 4WD P/U V6-173 2.8L VIN B 2-bbl (1984)
Idle Speed: Technical Service Bulletins
Engine - Altitude Adjustments
Number:
84-207
Section:
6E (VIt)
Date:
Oct., 1984
Subject:
ALTITUDE ADJUSTMENTS AND ENGINES
Model and Year:
ALL 1984 TRUCKS WITH GASOLINE ENGINES
TO:
ALL CHEVROLET DEALERS
This bulletin has been divided into two (2) procedures. Procedure I is applicable to Low Altitude (NA5) trucks taking up permanent residence in a high
altitude county. Procedure II is applicable to High Altitude (NA6) trucks and/or "exempt high altitude" trucks.
The only exception is the California closed loop (Computer Command Control) system which is self compensating for altitude. Applicable California
engines which require no adjustment are the 1.9L, 2.8L, 4.1L, 5.0L, and 5.7L engines.
VEHICLE EMISSION CONTROL INFORMATION UPDATE LABEL
Anytime a vehicle is modified for an altitude change, a label is needed. The label should be affixed in a readily visible position in the engine
compartment and where possible beside an existing Emission Control Information (Tune-up) label and should not be affixed to any equipment that can
be easily detached from the vehicle.
Prior to installation of this label, the dealer code number and date of modification must be typed (with or without ribbon) or lettered with ball-point pen
in the space provided.
FIGURE 1 - VEHICLE EMISSION CONTROL INFORMATION UPDATE LABEL - P/N 14057201
The labels can be ordered from GM Parts, P/N 14057201. Labels are no longer supplied through Helm - order directly from WDDGM (see Figure 1).
HIGH ALTITUDE COUNTIES
The following is a list of high altitude counties:
State of Colorado
Adams
Fremont
Montezuma
Alamosa
Garfield
Montrose
Arapahoe
Gilpin
Morgan
Archuleta
Grand
Otero
Boulder
Gunnison
Ouray
Chaffee
Hinsdale
Park
Cheyenne
Huerfano
Pitkin
Clear Creek
Jackson
Pueblo
Conejos
Jefferson
Rio Blanco
Costilla
Kit Carson
Rio Grande
Crowley
Lake
Routt
Custer
La Plata
Saguache
Delta
Larimer
San Juan
Denver
Las Animas
San Miguel
Dolores
Lincoln
Summit
Douglas
Mesa
Teller