For 1990-2009 cars

# TIP-IN HESITATION PCV RESTRICTOR(ALTITUDE)

The following procedures are to be used to correct a driveability and tip-in-hesitation condition on 1982 Cutlass Cieras equipped with a Federal 3.0L engine in altitude areas only. The carburetor calibration procedure provides more lean built authority to avoid excessively rich air/fuel mixtures at altitude. The PCV restrictor restricts the bleed of manifold vacuum through the PCV system to ensure proper carburetor operation.

All new General Motors vehicles are certified by the United States Environmental Protection Agency as conforming to requirements of the regulations for the control of air pollution from new motor vehicles. This certification is contingent on certain adjustments being satisfactory standards. In most cases, these adjustment points either have been permanently sealed and/or made inaccessible to prevent indiscrimate or routine adjustment in the field. For this reason, the factory procedure for temporarily removing plugs, caps, etc., for purposes of servicing the product, must be strictly followed, and whenever practicable, returned to the original intent of the design.

Before the following procedures are used, the carburetor must be reset if internal adjustments have been made, according to Dealer Technical Bulletin 82-T-23.

If the carburetor has not been internally adjusted, proceed with the following recalibration procedures.

Remove carburetor using procedures outlined in the 1982 Omega and Cutlass Ciera Service Manual.

Remove idle mixture needle plugs, using plug removal procedure in the Omega and Cutlass Ciera Service Manual. See Figure 1.

Using Tool J-20930, BT-7610-B, or equivalent, turn each idle mixture needle inward until lightly seated. Then back out each mixture needle one (1) full turn.

Reinstall carburetor.

D & C PCV hose and install restrictor in the middle of the PCV hose so the PCV valve nipple is tight up against one side of the restrictor and the steel pipe is tight against the other side. This will assure proper installation of the restrictor.

The PCV restrictor can be obtained from the Zone Offioe or can be fabricated locally. Refer to Figure 2.

Check base timing - specification is 15 DEG.

Reinstall air cleaner assembly.

Disconnect purge hose (bowl vent hose) at the canister and plug.

Purge hose must be disconnected and plugged to obtain correct adjustment.

- Using a dwell meter with engine sufficiently warmed up (in closed loop), adjust idle mixture scrwws to obtain a 15 to 20 degree dwell.

Reconnect purge hose.

Atter adjustments are complete, seal the idle mixture screws, using silicone sealant RTV rubber, or equivalent. The sealer is required to prevent tampering with the setting and to prevent the possibility of loss of fuel vapors.

WARRANTY INFORMATION

Labor Labor Time Trouble Operation Allowance Code --------- --------- ---- T4070 .9 hrs. 92

COUNTIES WHICH ARE DESIGNATED HIGH-ALTITUDE AREAS

ARIZONA MONTANA UTAH

Apache Navajo Beverhead Madison Beaver Morgan Cochise Yavapei Deer Lodge Meagher Box Elder Piute Coconino Gallatin Park Cache Rich Jefferson Silver Bow Carbon Salt Lake COLORADO Judith Basin Wheatland Daggett San Juan Powell Davis San Pete Adams Kit Carson Duschesne Sevier Alamosa Lake NEBRASKA Emery Summit Arapahoe LaPlata Garfield Tooele Archuleta Larimer Banner Kimball Grand Unitah Boulder Las Animas Cheyenne Sioux Iron Utsh Chaffee Lincoln Juab Wasatch Cheyenne Mesa NEVADA Kane Wayne Clear Creek Mineral Millard Weber Conejos Moffat Carson City Lyon Costilla Montezuma Douglas Mineral WYOMING Crowley Montrose Elko Nye Custer Morgan Esmoralda Pershing Albany Natrona Delta Otero Eureka Storey Campbell Niobrara Denver Ouray Humboldt Washoe Carbon Park Dolores Park Lander White Pine Converse Platte Douglas Pitkin Lincoln Fremont Sublette Eagle Pueblo Goshen Sweetwater Elbert Rio Blanco NEW MEXICO Hot Springs Teton El Paso Rio Grande Johnson Vinta Fremont Routt Bernalillo Mora Laramie Washakie Garfield Saguache Catron Rio Arriba Lincoln Weston Gilpin San Juan Colfax Roosevelt Grand San Miguel Curry Sandoval Gunnison Summit DeBaca San Juan Hinsdale Teller Grant Sans Miguel Huerfano Washington Guadalupe Santa Fe Jackson Weld Harding Sierra Jefferson Hidalgo Socorro Lincoln Taos IDAHO Los Alamos Torrance Luna Union Bannock Franklin McKinley Valencia Bear Lake Fremont Otero Bingham Jefferson Blaine Lemhi OREGON Booneville Madison Butte Minidoka Harney Lake Camas Oneida Klamath Caribou Power Cassia Teton TEXAS Clark Valley Custer Jeff Davis Hudspeth Parmer

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.