For 1990-2009 cars

# CHECKING MIXTURE CONTROL SOLENOID PLUNGER TRAVEL

#### MODELS AFFECTED: 1982 and Past Models - Carburetor Models E2ME-E2MC-E4ME-E4MC

The current service procedure (Page 6C-31 of the 1981 Buick Chassis Service Manual) of using Float Gage J-9789-130, BT-7720, or equivalent, inserted down the "D" shaped vent hole to check Mixture Control (M/C) Solenoid Plunger Travel (Illustration), is unchanged for 1982 and past model E2ME-E2MC-E4ME-E4MC carburetors used with the Computer Command Control or Computer Controlled Catalytic Converter System. Basically, the procedure calls for - 'subtract gage up dimension from gage down dimension and record difference (in inche THE DIFFERENCE IN DIMENSIONS IS TOTAL SOLENOID PLUNGER TRAVEL'.

Prior to now, solenoid plunger travel was 2/32" - 4/32". As production experience has been gained during factory flow testing, it has been determined that total solenoid plunger travel of 3/32" to 5/32" more closely represents actual production settings and should be used.

Service personnel are advised to use the range of 3/32" - 5/32" (Mean 4/32") on 1982 and past model E2ME-E2MC-E4ME-E4MC carburetors when checking and adjusting Mixture Control Solenoid Plunger Travel'.

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.