ISC ADJUSTMENT SPECS ALL CARBURETORS WITH ISC

A listing of ISC specifications from 1981 model year through 1983 is provided in this bulletin.

The specifications given in this bulletin are to supplement information provided in Service Manuals.

IDLE SPEED CONTROL (ISC) ADJUSTMENT SPECIFICATIONS (RPM)

1981 Base Idle Stop Screw RPM1 ISC Plunger RPM2 (Minimum Authority) (Maximum Authority)

Buick 3.8L (VIN Code A) 450D 900D

Pontiac 2.5L (VIN Code 5) A.T. 630-650D 2000 Park M.T. 930-950N 2400N 4.3L (VIN Code S) 400D 1200D 4.9L Non-Turbo (VIN Code W) 400D 950D 4.9L Turbo (VIN Code T) 400D 1000D

Oldsmobile 5.0L (VIN Code 5) 400D 850D (Only With ISC) 1982 J-Cars - 1.8L L-4 (VIN Code G)

(All Specifications in This Column Carburetor Part Are in Drive For A.T.)

17081600 700 2300 P/N 17081601 750 1700 P/N 17081606 750 2300 P/N 17081607 700 1200 P/N 17081609 700 1700 P/N 17081700 725 1600 P/N 17081701 725 1900 P/N

17082300 700 2300 P/N 17082301 750 1700 P/N 17082303 700 1200 P/N 17082304 750 2300 P/N 17082305 700 1700 P/N

Buick 3.8L (VIN Code A) 450D 900D 4.1 L (V I N Code 4) 470D 900D

1983 Buick 3.8L V-6 (VIN Code A) 450D 900D

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.