COLD DRIVEABILITY COMPLAINTS NEW TIMING ADVANCE KIT & PROM

Model and Year: 1986 SPECTRUM

Some 1986 Spectrum vehicles may experience engine driveability complaints of "stalls when starting" or hesitation and sag when driving with the engine at cold operating temperatures.

For vehicles exhibiting these conditions a new PROM and a cold timing advance kit have been developed and are available from GMSPO by ordering the following Part Numbers:

ALL VEHICLES: KIT - COLD TIMING ADVANCE P/N 94479402

(Kit includes the following components) Vacuum Switching Valve (VSV) P/N 94440223 Hose P/N 94006697 Clip P/N 94025647 Label P/N 94473176 Harness PIN 94458535 Valve P/N 94249018 Hose P/N 94440224

AUTO. TRANS. VEHICLES: Calibrator (PROM) PIN 16069045

MAN. TRANS. VEHICLES: Calibrator (PROM) P/N 16069048

SERVICE PROCEDURE:

1. Install the calibrator appropriate to the transmission installed in the vehicle using normal service proce- dures. Reference Figure 1 or Figure 2 as appropriate - without A/C with A/C.

2. Attach cold timing advance kit VSV bracket (P/N 94440223) to left hand strut tower at existing threaded hole using bolt supplied.

3. Disconnect vacuum hose - inlet manifold to distributor vacuum advance servo - discard hose.

4. Connect vacuum hose, part of P/N 94440224, shown shaded in Figure 1 and 2 to inlet manifold connection, VSV and delay valve (P/N 94249018) as shown on vacuum hose routing label, P/N 944731756.

5. Connect vacuum hose, part of P/N 94440224, shown white in Figure 1 and 2 to distributor vacuum advance servo and VSV as shown on vacuum hose routing label.

6. Disconnect EFE heater harness connector located at rear right hand side of engine adjacent to alternator - See Figure 3.

7. Connect electrical harness VSV, P/N 94458535, to EFE harness connector (part of cold timing advance kit) to EFE heater harness connector as shown in Figure 1 and 2. Route and secure harness to existing clips at dash- upper panel.

Labor Operation Number: T1253

Labor Time: .6 Hours

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.